Instruction Manual 748213-S April 2002 Model 755R Oxygen Analyzer http://www.processanalytic.
ESSENTIAL INSTRUCTIONS READ THIS PAGE BEFORE PROCEEDING! Rosemount Analytical designs, manufactures and tests its products to meet many national and international standards. Because these instruments are sophisticated technical products, you MUST properly install, use, and maintain them to ensure they continue to operate within their normal specifications.
Instruction Manual 748213-S April 2002 Model 755R TABLE OF CONTENTS PREFACE...........................................................................................................................................P-1 Definitions ...........................................................................................................................................P-1 Intended Use Statement...................................................................................................................
Instruction Manual 748213-S April 2002 3-0 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 4-0 4-1 4-2 4-3 OPERATION .........................................................................................................................3-1 Overview................................................................................................................................3-1 Operating Range Selection ...................................................................................................
Instruction Manual 748213-S April 2002 Model 755R 6-5 6-6 Replacement Of Detector/Magnet Components ...................................................................6-5 a. Source Lamp...................................................................................................................6-5 b. Photocell .........................................................................................................................6-5 c. Detector........................................................
Instruction Manual 748213-S April 2002 Model 755R LIST OF TABLES Table 2-1. Table 3-1. Table 3-2. Remote Range Switching Truth Table................................................................. 2-12 Calibration Range for Various Zero-Based Operating Ranges ............................. 3-4 Oxygen Equivalent of Common Gases .................................................................
Instruction Manual 748213-S April 2002 Model 755R PREFACE The purpose of this manual is to provide information concerning the components, functions, installation and maintenance of the 755R. Some sections may describe equipment not used in your configuration. The user should become thoroughly familiar with the operation of this module before operating it. Read this instruction manual completely.
Instruction Manual 748213-S April 2002 Model 755R INTENDED USE STATEMENT The Model 755R is intended for use as an industrial process measurement device only. It is not intended for use in medical, diagnostic, or life support applications, and no independent agency certifications or approvals are to be implied as covering such application. SAFETY SUMMARY If this equipment is used in a manner not specified in these instructions, protective systems may be impaired.
Instruction Manual 748213-S April 2002 Model 755R WARNING. PARTS INTEGRITY Tampering or unauthorized substitution of components may adversely affect safety of this product. Use only factory documented components for repair. CAUTION PRESSURIZED GAS This module requires periodic use of pressurized gas.
Instruction Manual 748213-S April 2002 Model 755R GENERAL PRECAUTIONS FOR HANDLING AND STORING HIGH PRESSURE GAS CYLINDERS Edited from selected paragraphs of the Compressed Gas Association's "Handbook of Compressed Gases" published in 1981 Compressed Gas Association 1235 Jefferson Davis Highway Arlington, Virginia 22202 Used by Permission 1. Never drop cylinders or permit them to strike each other violently. 2.
Instruction Manual 748213-S April 2002 Model 755R DOCUMENTATION The following Model 755R instruction materials are available. local representative to order. Contact Customer Service Center or the 748213 Instruction Manual (this document) COMPLIANCES This product satisfies all obligations of all relevant standards of the EMC framework in Australia and New Zealand. N96 Rosemount Analytical Inc.
Instruction Manual 748213-S April 2002 P-6 Preface Model 755R Rosemount Analytical Inc.
Instruction Manual 748213-S April 2002 Model 755R SECTION 1 DESCRIPTION AND SPECIFICATIONS Board assembly and the Power Supply Board assembly. The Control Board has receptacles that accept optional plug-in current output board and alarm features. 1-1 DESCRIPTION The Model 755R Oxygen Analyzer provides continuous readout of the oxygen content of a flowing gas sample. The determination is based on measurement of the magnetic susceptibility of the sample gas.
Instruction Manual 748213-S April 2002 1-5 ALARM OPTION The alarm option contains: • An alarm circuit incorporating two comparator amplifiers, one each for the ALARM 1 and ALARM 2 functions. Each amplifier has associated setpoint and deadband adjustments. Setpoint is adjustable from 1% to 100% of fullscale. Deadband is adjustable from 1% to 20% of fullscale.
Instruction Manual 748213-S April 2002 Model 755R 1-8 SPECIFICATIONS1 a. Performance Operating Range (Standard) ......... 0 to 5, 0 to 10, 0 to 25, 0 to 50, and 0 to 100% oxygen Operating Range (Optional) .......... 0 to 1, 0 to 2.5, 0 to 5, 0 to 10, 0 to 25, 0 to 50, and 0 to 100% oxygen Response Time ............................. 90% of fullscale, 20 seconds Reproducibility ............................... 0.01% oxygen or ±1% of fullscale, whichever is greater Ambient Temperature Limits .........
Instruction Manual 748213-S April 2002 c. Model 755R Electrical Supply Voltage and Frequency (selectable when ordered)............ Standard: 115 VAC ±10 VAC, 50/60 Hz Optional: 230 VAC ±10 VAC, 50/60 Hz Power Consumption ...................... Maximum: 300 watts Outputs .......................................... Standard: Field selectable voltage output of 0 to 10mV, 0 to 100mV, 0 to 1V, or 0 to 5VDC Optional: Isolated current output of 0 to 20mA or 4 to 20mA (with Current Output Board) Alarm Option.....
Instruction Manual 748213-S April 2002 Model 755R SECTION 2 INSTALLATION 2-1 FACILITY PREPARATION Observe all precautions given in this section when installing the instrument. a. Installation Drawings For outline and mounting dimensions, gas connections, and other installation information, refer to Installation Drawing 654015 at the back of this manual. b. Electrical Interconnection Diagram Electrical interconnection is also shown in drawing 654015. Refer also to Section 25, page 2-6. c.
Instruction Manual 748213-S April 2002 Model 755R 2-2 CALIBRATION GAS REQUIREMENTS a. In the preferred calibration method, described in Section 3-4a (page 3-1), a suitable zero standard gas is used to establish a calibration point at or near the lower range limit. Composition of the zero standard normally requires an oxygen-free zero gas, typically nitrogen. WARNING HIGH PRESSURE GAS CYLINDERS Calibration gas cylinders are under pressure.
Instruction Manual 748213-S April 2002 Model 755R Needle Valves Model 755R Oxygen Analyzer Sample In Two Micron Filter Zero Standard Gas To Vent Flowmeter Span Standard Gas Figure 2-1. Interconnect of Typical Gas Manifold to Model 755R b. Pressure Requirements - General Operating pressure limits are as follows: maximum, 10 psig (68.9 kPa); minimum, 5 psig vacuum (34.5 kPa vacuum).
Instruction Manual 748213-S April 2002 Model 755R mum, 500 cc/min. A flow rate of less than 50 cc/min is too weak to sweep out the detector and associated flow system efficiently. Incoming sample may mix with earlier sample, causing an averaging or damping effect. Too rapid a flow will cause back pressure that will affect the readout accuracy. The optimum flow rate is between 200 and 300 cc/min. directly proportional change in the indicated percentage of oxygen. Example: Range, 0% to 5% O2.
Instruction Manual 748213-S April 2002 Model 755R For proper operation and safety, system leakage must be corrected, particularly before introduction of toxic or corrosive samples and/or application of electrical power. 2-4 LEAK TEST WARNING TOXIC OR CORROSIVE HAZARD To check system for leaks, liberally cover all fittings, seals, and other possible sources of leakage with suitable leak test liquid such as SNOOP (P/N 837801). Check for leak indicative bubbling or foaming.
Instruction Manual 748213-S April 2002 Model 755R equipment from the analyzer power cable (Refer to Figure 2-3 below). 2-5 ELECTRICAL CONNECTIONS WARNING If the analyzer is mounted in a protected rack or cabinet or on a bench, an accessory kit (P/N 654008) is available which provides a 10-foot North American power cord set and a liquid-tight feed through gland for the power cable hole. The kit also contains four enclosure support feet for bench top use.
Instruction Manual 748213-S April 2002 Model 755R c. Potentiometric Output d. 1. Insert RECORDER OUTPUT Selector Plug (See Figure 3-1) in position appropriate to the desired output: 10 mV, 100 mV, 1V or 5V. 2. Connect leads of shielded recorder cable to “REC OUT +” and “-” terminals on the I/O board. 3. Connect the output cable to the appropriate terminals of the recorder or other potentiometric device: a.
Instruction Manual 748213-S April 2002 e. Model 755R Output Connections and Initial Setup for Dual Alarm Option If so ordered, the analyzer is factory equipped with alarm output. Alternatively, the alarm feature is obtainable by subsequent installation of the 654019 Alarm Kit. REQUIREMENT TYPICAL CONNECTIONS No. 1 RESET Alarm Bell or Lamp TYPICAL CONNECTIONS No.
Instruction Manual 748213-S April 2002 Model 755R Alarm 1 and Alarm 2 output through the 654019 Alarm Relay Assembly is provided by two identical single-pole, double-throw relays.
Instruction Manual 748213-S April 2002 Model 755R Carefully rotate R63 counterclockwise the minimum amount required to obtain energization of ALARM 1 Relay K1 (See Figure 2-6 below and Figure 3-1, page 33). Energization may be verified by connecting an ohmmeter to relay terminals on 654019 Alarm Relay Assembly. b. the display or recorder reads exactly fullscale. c. Set ALARM 2 Calibrate Adjustment (R67) to its clockwise limit.
Instruction Manual 748213-S April 2002 Model 755R TB4 NO 1 9 COM J5 5 CR1 +15V 1 -15V 2 13 14 Alarm No. 1 8 12 K1 Alarm No. 1 Command NC Reset 4 NO 1 9 COM 5 CR2 14 Alarm No. 2 13 K2 Alarm No. 2 Command NC 12 8 Reset 6 2. CR! AND CR2 ARE ANY 600V, 1 AMP DIODE. 1. RELAYS SHOWN IN ENERGIZED POSITION. NOTES: Figure 2-7. Alarm Relay Assembly Schematic Diagram Rosemount Analytical Inc.
Instruction Manual 748213-S April 2002 Model 755R To use the internal 12 V supply: 2-6 REMOTE RANGE CHANGE OPTION The power supply circuitry on the Remote Range Board 646004 must be jumpered for the correct line voltage, either 115 VAC or 230 VAC. See Drawings # 656081 (Table 2) and 646090 for correct jumper locations. 1. Verify the E to F jumper is in place.
Instruction Manual 748213-S April 2002 Model 755R SECTION 3 OPERATION proceed to Section 3-4 below. Otherwise, refer to Section 6, Maintenance and Service. 3-1 OVERVIEW Preparatory to operation, a familiarization with Figure 3-1 (page 3-3) is recommended. This figure gives locations and summarized descriptions of operating adjustments of the Model 755R Oxygen Analyzer. 3-4 CALIBRATION 3-2 OPERATING RANGE SELECTION The Model 755R is designed to operate on a single, field-selectable range.
Instruction Manual 748213-S April 2002 Model 755R Set Span Calibration Point Inject span standard gas (see Table 3-1, page 3-4) through the analyzer at the same flow rate as was used for zero standard gas. Allow gas to purge analyzer for a minimum of three minutes. Adjust SPAN control so that reading on display or recorder is appropriate to the span standard gas. 3-5 COMPENSATION FOR COMPOSITION OF BACKGROUND GAS Any gas having a composition other than 100% oxygen contains background gas.
Instruction Manual 748213-S April 2002 Model 755R 8 15 5 7 4 3 2 6 10 13 E15 E17 E19 TP5 TP6 TP7 TP8 TP9 TP10 TP11 TP16 TP17 TP18 TP19 TP20 E23 E11 E10 E24 E12 E14 E16 E18 E20 100% 50% 25% 10% E9 E13 SPAN R90 R3 R4 R8 R9 CR2 R88 R30 R29 R100 C64 R68 C63 R79 R74 R9 R1 Q1 U20 U19 R47 R84 R85 R86 R102 R5 R6 12 R67 9 R73 14 R64 U17 R2 R63 R89 R52 R87 R53 R82 5% 2.
Instruction Manual 748213-S April 2002 Model 755R RANGE % OXYGEN 0 to 1 0 to 2.5 0 to 5 0 to 10 0 to 25 0 to 50 0 to 100 Table 3-1. a. RECOMMENDED ZERO STANDARD GAS Nitrogen Nitrogen Nitrogen Nitrogen Nitrogen Nitrogen Nitrogen RECOMMENDED SPAN STANDARD GAS 0.9% O2, balance N2 2.3% O2, balance N2 4.5% O2, balance N2 9% O2, balance N2 Air (20.
Instruction Manual 748213-S April 2002 Model 755R Use the following equation to compute the adjusted settings for the ZERO and SPAN controls: Adjusted % O2 for standard gas = (A)[100 + (B-C)] - 100 [B-C] 100 Where: A = true % O2 of standard gas B = BGGs C = BGGst Example: Background gas in sample is CO2, oxygen equivalent = -0.623% Zero gas is 100% N2 Span standard gas is air: 21% O2, 79% N2 Background gas in zero and span standard gases is N2, oxygen equivalent = -0.
Instruction Manual 748213-S April 2002 Model 755R GAS Acetylene, C2H2 Allene, C3H4 Ammonia, NH3 Argon, A Bromine, Br2 1,2-Butadiene C4H6 1,3-Butadiene C4H6 n-Butane, C4H10 iso-Butane, C4H10 Butene-1, C4H8 cis Butene-2, C4H8 iso-Butene, C4H8 trans butene-2, C4H8 Carbon Dioxide CO2 Carbon Monoxide, CO Ethane, C2H6 Ethylene, C2H4 Helium, He n-Heptane, C7H16 n-Hexane, C6H12 cyclo-Hexane, C6H12 Hydrogen, H2 Hydrogen Bromide, Hbr Hydrogen Chloride, HC1 Hydrogen Fluoride, HF Hydrogen Iodide, HI Hydrogen Sulphide,
Instruction Manual 748213-S April 2002 Model 755R 3-6 SELECTION OF SETPOINTS AND DEADBAND ON ALARM OPTION The ALARM 1 and ALARM 2 setpoint adjustments (see Figure 3-1, page 3-3) are adjustable for any desired value from 1% to 100% of the fullscale analyzer span. The adjustment screws are graduated from 0 to 10.
Instruction Manual 748213-S April 2002 Model 755R 3-8 ROUTINE OPERATION 3-10 CALIBRATION FREQUENCY After the calibration procedure of Section 3-4 (page 3-1), admit sample gas to the analyzer at the same pressure and the same flow rates used for the zero and span gases. The instrument will now continuously indicate the oxygen content of the sample gas.
Instruction Manual 748213-S April 2002 Model 755R SECTION 4 THEORY 4-1 PRINCIPLES OF OPERATION Oxygen is strongly paramagnetic while most other common gases are weakly diamagnetic. The paramagnetism of oxygen may be regarded as the capability of an oxygen molecule to become a temporary magnet when placed in a magnetic field. This is analogous to the magnetization of a piece of soft iron. Diamagnetic gases are analogous to non-magnetic substances.
Instruction Manual 748213-S April 2002 Model 755R 4-2 VARIABLES INFLUENCING PARAMAGNETIC OXYGEN MEASUREMENTS Variables that influence paramagnetic oxygen measurements include: operating pressure (See Section 4-3a, page 4-4), sample temperature, interfering sample components, and vibration (See Section 2-1d, page 2-1). a. Pressure Effects Although normally calibrated for readout in percent oxygen, the Model 755R actually responds to oxygen partial pressure.
Instruction Manual 748213-S April 2002 Model 755R Displacement Torque Electromagnetic Axis Restoring Torque Restoring Current Balancing Weight Electromagnetic Axis Nitrogen-Filled Hollow Glass Test Body Titanium Wire Conductor Mirror Balancing Weight Restoring Current Platinum/Nickel Alloy Suspension Ribbon TEST BODY DETAIL Displacement Torque Restoring Torque Restoring Current Magnet Test Body Source Lamp DS1 DETECTOR/MAGNET ASSEMBLY CONTROL ASSEMBLY Shaded Pole Pieces (4) Dual Photocell
Instruction Manual 748213-S April 2002 Model 755R Shaded Pole Piece Sphere (Magnetic Susceptibility = ko ) Fk Sample Gas (Magnetic Susceptibility = k ) Note: As percentage of oxygen in sample gas increases, displacement force (Fk ) increases. Figure 4-2. Spherical Body in Non-Uniform Magnetic Field in turn, supplies the restoring current to the titanium wire loop on the test body (See Section 4-1, page 4-1).
Instruction Manual 748213-S April 2002 Model 755R The output signal from U10 is routed to two output circuits: a digital and an analog. Input Amplifier U1 This amplifier receives the error signal from the dual photocell of the detector assembly and drives amplifier U2. In the Digital Output Circuit, the signal from U10 passes to an integrating analog-to-digital converter. The resulting digital signal drives the liquid crystal display.
Instruction Manual 748213-S April 2002 Model 755R ±15 V Power Supply Section Detector Compartment Temperature Control Section This section provides DC voltage required for various amplifiers and other circuits. This section maintains the interior of the detector compartment at a controlled temperature of 140°F (60°C). Temperature is sensed by a thermistor located in the detector compartment and plugged into the Control Board assembly.
Instruction Manual 748213-S April 2002 Model 755R Sample Pre-Heating Coil Sample Inlet Tube Sample Outlet Tube Magnet Assembly Detector Assembly Optical Bench Assembly Mounting Screws (2) A.
Instruction Manual 748213-S April 2002 4-8 Theory Model 755R Rosemount Analytical Inc.
Instruction Manual 748213-S April 2002 Model 755R SECTION 5 CIRCUIT ANALYSIS 5-1 CIRCUIT OPERATION The electronic circuitry of the Model 755R Oxygen Analyzer consists of the following: • A detector compartment heater circuit. • A detector heater circuit. • A ±15 VDC power supply. • A voltage regulating circuit for a stable light source.
Instruction Manual 748213-S April 2002 Model 755R output remains at -15 VDC until the incoming signal crosses zero value and the positive signal causes the comparator 2 transistor to cease to conduct. the temperature bridge at the rate of 120 pulses per second. Capacitor C36 is added to the input circuit to delay the incoming AC signal so that the pulses will occur at or just after the line frequency crossover point.
Instruction Manual 748213-S April 2002 Model 755R +15V T1 R69 2M 19 VAC TO POWER SUPPLY 120 V RMS R67 10K - 590K - CR9 R77 3 10K + R70 R71 21.5K C37 1.0uF 20M R79 10K R75 CR11 Q6 T2 210K 2 R68 + R76 37.4K 3.3K C36 R72 4.75K 249K R74 1 + 19 VAC 12 R78 - R73 CR10 R80 10K C40 2200uF 20M .18uF -15V R82 9.07K C39 .01uF R83 11.0K 63.4K C38 20M .18uF - R84 169K RT1 R81 56.2 R86 R85 R87 10K 4 + -15V Figure 5-2. Case Heater Control Circuit OFF +2.
Instruction Manual 748213-S April 2002 Capacitor C37 will now start to charge positively through R78. When the positive potential across C37 and at the inverting terminal of comparator 3 exceeds the potential on the non-inverting terminals, the transistor conducts. The output is -15 V. A full 30 V drop appears across R77. The potential on the non-inverting terminal will now be about -2.3 V. C37 will not discharge through R78 until its potential exceeds that on the non-inverting terminal.
Instruction Manual 748213-S April 2002 Model 755R C38 charges and a pulse appears at the gate of Triac Q7, turning it on again. The charging time for C38 is about one-half a time constant (C38, R87) and ten time constants (R81, C38) are available for discharging C38. The above action is repeated as long as the temperature is low, causing an error between R82, R83 junction and RT1, R84 junction.
Instruction Manual 748213-S April 2002 Model 755R If the temperature goes down, RT1 increases in resistance and causes the junction of RT1 and R59 to go positive in voltage value. Since R55 and R56 are of equal resistance, their junction is at zero volts. Therefore, terminal 3 of AR6 is more positive than terminal 2 and the base of Q2 is positive. Q2 conducts, allowing alternating current to flow through heaters 1 and 2.
Instruction Manual 748213-S April 2002 Model 755R current going through DS1 is shunted from the main current path, and goes through Q5, which acts as a variable feedback resistance, goes to the positive output potential of AR7. 5-5 DETECTOR LIGHT SOURCE CONTROL CIRCUIT Refer to Figure 5-5 below. The detector light source control circuit maintains the light output from the bulb (DS1) as uniform as possible, regardless of voltage fluctuations or aging of the bulb.
Instruction Manual 748213-S April 2002 Refer to Figure 5-6, page 5-9. The detector assembly consists of a test body suspended on a platinum wire and located in a non-uniform magnetic field. formly on each photocell. A current proportional to the oxygen concentration in the magnetic field of the test assembly has to be flowing through the feedback loop in order to maintain balance and provide a reading of the oxygen content of a sample.
Instruction Manual 748213-S April 2002 Model 755R will cause the dumbbell and mirror to be positioned correctly in the test body. imbalance in the detector and the photocells BT1 and BT2. As the charge on C1 increases, the cathode of CR2 becomes more positive. When it exceeds that on the anode, CR2 ceases to conduct and isolates the +15 VDC and -15 VDC power supply from the input circuit.
Instruction Manual 748213-S April 2002 Model 755R Analog output circuits for recorder, V/I and alarms (See Section 5-9, page 5-11). 5-7 BUFFER AMPLIFIERS U8 AND U10 WITH ASSOCIATED ANTICIPATION FUNCTION Refer to Figure 5-8, page 5-12. U8 is a unity gain amplifier that provides zeroing capability and a buffered output for the anticipation circuit feeding U10. 5-8 DIGITAL OUTPUT CIRCUIT Refer to Figure 5-7 below.
Instruction Manual 748213-S April 2002 Model 755R 5-9 ANALOG OUTPUT CIRCUITS FOR RECORDER AND ALARMS Refer to Figure 5-8, page 5-12. The analog output circuits utilize two amplifiers, first-stage amplifier and second-stage amplifier. a. 3. Dual Alarm Amplifier Circuit. This circuit drives the optional 654019 Alarm Relay Assembly. First Stage Amplifier Permits selection of the desired fullscale oxygen range for the recorder via jumper-selectable signal amplification for scale expansion.
Instruction Manual 748213-S April 2002 Model 755R 100 R85 2M 50 R102 40K 25 R86 80K 10 R52 Recorder Span (Jumper Selectable) 200K 5 R87 R50B 400K 20K 2.5 R53 R50C 800K 1 R82 20K C55 TP18 2M C46 .1uF FROM U10 R84 - 20K .1uF U13 + R50A 20K To Alarm and V/I - 5V U16 + E1 E2 To Recorder R88 500 R57 3.83K 1V E3 E4 R58 909 Recorder Output (Jumper Selectable) 100mV E5 E6 R59 90.9 10mV E7 E8 R60 10 Figure 5-8.
Instruction Manual 748213-S April 2002 Model 755R SECTION 6 MAINTENANCE AND SERVICE The information provided in this section will aid in isolation of a malfunction to a particular assembly or circuit board. A few detailed checks are included, to aide in locating the defective assembly. It is recommended that those familiar with circuit analysis, refer to Section 6 Circuit Analysis of this manual.
Instruction Manual 748213-S April 2002 Model 755R 2. Adjust R29 clockwise and counterclockwise. The display should follow accordingly and remain steady within the adjustment limits of R29. If this condition is met, refer to Section 6-6a (page 6-7) for Control Board setup. Before replacing the Control Board, test for -15V at the junction of C1/J47. Use the junction of CR1/R2 for +15V, or any source of ±15V on the board for the respective voltages. 3.
Instruction Manual 748213-S April 2002 Model 755R pins 15 and 16 of the detector connector J12, should be approximately 89 ohms. If resistance is correct, and the combined resistance is incorrect, heater HR1 may be open. To reach the leads of HR1, remove the circuit board on the heater assembly. Resistance of HR1 should be approximately 21 ohms. VDC when cold and will drop to approximately 0.4 VDC at control temperature.
Instruction Manual 748213-S April 2002 Model 755R Connect J12 has slots at top and bottom. To remove a connector pin/lead, insert the tool into the upper or lower slot and push down on the end to release the keeper on the pin. 6-4 DETECTOR CHECK To isolate the detector as the problem, it is necessary to check the source lamp, photocells, and suspension (see Figure Figure 6-1B, page 6-3). These components are connected via J12 on the optical bench assembly.
Instruction Manual 748213-S April 2002 Model 755R a. Source Lamp The simplest check of the source lamp is to verify that it is lit. Another check is done by removing the housing cover and viewing the lamp through the photocell alignment hole (see Figure 6-3, page 6-4). If the photocell is not illuminated, test the voltage across TP2 to TP5 (ground). This voltage should be 2.2 V ±0.2 VDC. If reading is correct, the lamp may be burned out; also inspect the cable for continuity. If voltage reading is not 2.
Instruction Manual 748213-S April 2002 Model 755R 4. Apply power to instrument and allow to warm-up approximately one hour. 7. Connect the voltmeter between TP10 and circuit ground (TP7). Adjust front panel ZERO for reading of exactly zero on voltmeter. 5. Set front panel ZERO at mid-range (i.e., five turns from either end). All internal adjustments are now properly set. The instrument may be calibrated per Section 3-4, page 3-1. 6. Connect digital voltmeter from slider of R9 to chassis ground.
Instruction Manual 748213-S April 2002 Model 755R c. Detector Calibration 1. On the Control Board, set the front panel ZERO control (R13) at midrange (i.e., five turns from either end). Removal Prior to removal of the detector, remove power from instrument and stop flow of sample gas. 2. Connect a digital voltmeter from the slider of R9 to chassis ground. With a steady flow of 50 to 500 cc/min. of nitrogen gas passing through the instrument, adjust R9 for zero volts. 1.
Instruction Manual 748213-S April 2002 c. Model 755R 2. Adjust R29 to obtain a reading of 00.00 ±5 counts on the display. U4 Zero 1. Monitor TP5, adjust R100 for 1 VDC ±2mV. f. 2. Monitor TP10, adjust R13 (ZERO) for 0.0 VDC ±5mV. d. 1. Monitor TP11. Flow 100% oxygen, adjust SPAN potentiometer R20 for 10.00 V ±5mV. U8 Zero 2. Monitor TP16, adjust R20 for 10.00 V ±5mV. The display must read 100.00 ±5 counts. Monitor TP11, adjust R29 for 0.0 VDC ±5mV. e. U10 Zero g. 1.
Instruction Manual 748213-S April 2002 Model 755R SECTION 7 REPLACEMENT PARTS The following parts are recommended for routine maintenance and troubleshooting of the Model 755R Oxygen Analyzer. If the troubleshooting procedures do not resolve the problem, contact Rosemount Analytical Customer Service Center.
Instruction Manual 748213-S April 2002 Model 755R 7-2 MATRIX – MODEL 755R OXYGEN ANALYZER 755R Model 755R Oxygen Analyzer Code 01 02 99 Ranges 0-5, 10, 25, 50, and 100% O2 (Standard) 0-1, 2.
Instruction Manual 748213-S April 2002 Model 755R 7-3 SELECTED REPLACEMENT PARTS 092114 Fuse, 1/2A (240VAC) (Package of 5) 777362 Fuse, Heater 3A (120VAC) (Package of 15) 777361 Fuse, Heater 1.
Instruction Manual 748213-S April 2002 7-4 Replacement Parts Model 755R Rosemount Analytical Inc.
Instruction Manual 748213-S April 2002 Model 755R SECTION 8 RETURN OF MATERIAL 8-1 RETURN OF MATERIAL If factory repair of defective equipment is required, proceed as follows: 1. Secure a return authorization from a Rosemount Analytical Inc. Sales Office or Representative before returning the equipment. Equipment must be returned with complete identification in accordance with Rosemount instructions or it will not be accepted. Rosemount CSC will provide the shipping address for your instrument.
Instruction Manual 748213-S April 2002 8-2 Return of Material Model 755R Rosemount Analytical Inc.
WARRANTY Goods and part(s) (excluding consumables) manufactured by Seller are warranted to be free from defects in workmanship and material under normal use and service for a period of twelve (12) months from the date of shipment by Seller. Consumables, glass electrodes, membranes, liquid junctions, electrolyte, o-rings, etc., are warranted to be free from defects in workmanship and material under normal use and service for a period of ninety (90) days from date of shipment by Seller.
Instruction Manual 748213-S April 2002 Model 755R Emerson Process Management Rosemount Analytical Inc. Process Analytic Division 1201 N. Main St. Orrville, OH 44667-0901 T (330) 682-9010 F (330) 684-4434 E gas.csc@emersonprocess.com Fisher-Rosemount GmbH & Co. Industriestrasse 1 63594 Hasselroth Germany T 49-6055-884 0 F 49-6055-884209 ASIA - PACIFIC Fisher-Rosemount Singapore Private Ltd.
