D I G I TA L PA N E L M E T E R S Universal Temperature Meters Model PD750, PD751, PD752 Instruction Manual • J, K, T, E, R, and S Thermocouples • 100 Ω Platinum RTD • 10 Ω Copper RTD • 120 Ω Nickel RTD • Displays °F or °C • Factory Calibrated for All Inputs • Type T T/C and RTDs Displayed to 0.
Model PD750, PD751, PD752 Universal Temperature Meters TABLE OF CONTENTS Instruction Manual SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 POWER and SIGNAL CONNECTIONS . . . . . . . . .
Model PD750, PD751, PD752 Universal Temperature Meters ORDERING INFORMATION Instruction Manual Type J, K, T, E, R, S, and 100 Ω Platinum RTD : 115 VAC Model PD750-3-N PD750-3-14 PD750-3-15 PD750-3-16 230 VAC Model PD750-4-N PD750-4-14 PD750-4-15 PD750-4-16 24 VDC Model PD750-2-N PD750-2-14 PD750-2-15 PD750-2-16 PD750-3-17 PD750-3-18 PD750-4-17 PD750-4-18 PD750-2-17 PD750-2-18 115 VAC Model PD751-3-N PD751-3-14 PD751-3-15 PD751-3-16 230 VAC Model PD751-4-N PD751-4-14 PD751-4-15 PD751-4-16 24 VDC M
Model PD750, PD751, PD752 Universal Temperature Meters SPECIFICATIONS Instruction Manual Basic Meter INPUTS: PD750: Field selectable: type J, K, T, E, R, or S Thermocouples with 1° resolution; type T to 0.1° 100 Ω platinum RTD (.00385 or .00392 curve) to 1° or 0.1° resolution. PD751: 10 Ω copper RTD PD752: 120 Ω nickel RTD DISPLAY: Bright, large, 0.56” (14.2mm) high efficiency red, 41/2 digits. F or C may be switched on to indicate Fahrenheit or Celsius.
Model PD750, PD751, PD752 Universal Temperature Meters OPTIONS Instruction Manual Relays RATING: 2 or 4 SPDT (form C); rated 2 Amp @ 30 VDC or 2 Amp @ 250 VAC resistive load; 1/14 HP @ 125 / 250 VAC for inductive loads. RESET: User select. 1. Automatically when the input passes the reset point. 2. Automatically + manually (via user supplied switch or front panel ACK button). Manual reset resets all manually resetable relays. FAIL-SAFE OPERATION: The relay coils are energized in the non-alarm condition.
Instruction Manual Model PD750, PD751, PD752 Universal Temperature Meters SETUP Programming and installing the meter involves six basic steps. Step 1 Step 2 Remove jumper JP2 if installed, to disable the lockout feature. Configure the input signal jumper JP1 according to the input type, thermocouple or RTD, see charts below. Connect the input signal according to the chart below. Connect power. Program the input type, choice 0-10, see page 11. Program the scale type, Fahrenheit or Celsius, see page 12.
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual POWER and SIGNAL CONNECTIONS for DC POWERED UNITS No Connection RTD A 22-28 VDC V-V+ C O I K C G / K N H O IN M K C A A L L C / U A L D T L D T V-V+ JP2 C A E + Ð O C X JP1 IN M K C K U JP2 JP1 Three-Wire RTD Connections T/C A 22-28 VDC IN A L L S C O S C O I K C I K G / K N H O A L L C G / N H O U A L D T L D T C A E + Ð M K C I H O RTD O C X C O K G 22-2
Model PD750, PD751, PD752 Universal Temperature Meters PROGRAMMING Instruction Manual The meter’s Single Button Scaling feature allows it to be programmed using only the ENTER button. The general procedure is to press the ENTER button to accept a flashing display or to wait for the display to scroll and press ENTER when the desired display appears. For instance when the ENTER button is pressed, the meter scrolls through the standard programming routine titles: [ALIb , TYPE, F or [, Alars.
Model PD750, PD751, PD752 Universal Temperature Meters CALIBRATION FLOW CHART Instruction Manual The following flow chart illustrates a 2 point calibration using Single Button Scaling. The same general procedure is used for alarm set and reset point programming and 4-20 mA output programming. Press ENTER Press ENTER when appears flashes Apply input 1 signal (e.g. 2 V) flashes apply input 2 Press ENTER (e.g.
Model PD750, PD751, PD752 Universal Temperature Meters CALIBRATION ((ALIb) Instruction Manual The PD750 is pre-calibrated for 6 types of thermocouples and 2 types of 100 Ω RTD sensors. The PD751 is pre-calibrated for 10 Ω copper RTD sensors and the PD752 is pre-calibrated for 120 Ω nickel RTD sensors. These input ranges may be re-calibrated and should be checked every 12 months. Calibration is performed from the front panel using the ENTER button.
Model PD750, PD751, PD752 Universal Temperature Meters INPUT TYPE (TYPE) Instruction Manual The meter must be programmed for the input type it is to accept. Selecting the wrong input type will cause an incorrect temperature to be displayed. Selecting Input Type 1. Press ENTER. When TYPE appears, press ENTER again. 2. The meter displays TYPE and starts to scroll through make it choice. Press ENTER when desired digit appears, (see chart below). Meter will then reset back to indication mode.
Instruction Manual Model PD750, PD751, PD752 Universal Temperature Meters RECOMMENDED CALIBRATION POINTS Type Number Type of Input Input 1 (Low) Input 2 (High) Check (Middle) 0 Type J T/C 32°F 1182°F 600°F 1 Type K T/C 32°F 1183°F 960°F 2 Type T T/C 32°F 693°F 360°F 3 Type T T/C 32.0°F 693.0°F 360.0°F 4 Type E T/C 32°F 1652°F 840°F 5 Type R T/C 100°F 3000°F 1500°F 6 Type S T/C 100°F 3000°F 1500°F 7 100Ω RTD (0.00385, 0.1°) 32.0°F 100Ω 1148.0°F 320.12Ω 590.
Model PD750, PD751, PD752 Universal Temperature Meters 4 ALARM POINTS (Alars) Instruction Manual The meter is equipped with 4 alarm points as a standard feature. Each alarm may be programmed for either a high or low alarm and for 0-100% deadband. Front panel LEDs indicate alarm status. Options for 2 and 4 relays are available. To program a high alarm, program the set point above the reset point. To program a low alarm, program the set point below the reset point.
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual 5. If the flashing digit is OK, press ENTER before it scrolls. If not OK, wait for digit to scroll. 6. When digit is OK, press ENTER. Program remaining digits in same fashion. 7. When the last digit is OK, press ENTER. The entire display flashes for 3 seconds. Press ENTER if OK to complete alarm point programming and proceed to step 8. If not OK, wait, first digit flashes. Repeat steps 3-7. 8.
Instruction Manual Model PD750, PD751, PD752 Universal Temperature Meters FAIL-SAFE OPERATION: J2 Front Screw Terminals (Rear of PCB) The relay coils are energized in the non-alarm condition. In the case of a power failure, the relays will go to the alarm state. The fail-safe operation can be disabled by removing jumper J2 located at the front of the relay option card.
Model PD750, PD751, PD752 Universal Temperature Meters RELAYS (Optional) Instruction Manual The meter is available with 2 and 4 relays. The SPDT relays can be programmed for automatic or automatic + manual reset. The relays can also be programmed for 0-100% deadband. Set and Reset Point Programming Refer to page 13 to program the alarm (relay) set and reset points. Automatic and Manual Reset Programming There are two ways to reset the relays: 1.
Model PD750, PD751, PD752 Universal Temperature Meters SWITCHING INDUCTIVE LOADS Instruction Manual The meter has the ability to suppress electrical noise generated by switching inductive loads. However, installing suppressors improves this performance even more and prolongs the life of the meter’s relay contacts. This suppression can be obtained with RC networks assembled by the user or purchased as a complete assembly.
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual ISOLATED 4-20 mA OUTPUT OPTION (OvtPvt) The meter can be equipped with an isolated 4-20 mA output signal option that can be programmed to produce a 4-20 mA output for virtually any input. Connections The following drawings illustrate the 4-20 mA output signal being powered from the meter’s internal 24 V power supply (AC powered units only) and by an external power supply. - + Signal Input - Meter, Recorder Controller, etc.
Model PD750, PD751, PD752 Universal Temperature Meters 4 mA Output Calibration Instruction Manual 1. Press ENTER, when OvtPvt appears press ENTER again. 2. All digits flash for 3 seconds, a green LED labeled “4” illuminates indicating the flashing display is the value at which the meter will produce a 4 mA output. If this is the desired display at which the meter will produce a 4 mA out put, press ENTER before entire display stops flashing.
Model PD750, PD751, PD752 Universal Temperature Meters Programming Confirmation Instruction Manual The values that have been programmed to produce the 4 and 20 mA outputs can be quickly checked to make sure they are the desired values. To do this, enter the OvtPvt routine by pressing ENTER and then pressing ENTER again when OvtPvt appears. The green “4” LED illuminates indicating the meter is displaying the value at which it will produce a 4 mA output. Confirm that this is the desired value.
Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual OPTIONS CARD REMOVAL & INSTALLATION Meter options are installed at the factory. To disable relays’ fail-safe operation, it is necessary to remove the Boards from the case. Refer to the following instructions and illustrations. Disconnect power prior to performing the following operations. The meter's snap-off cover is held in place by 6 latches that snap into notches on the snap-off cover.
Instruction Manual Model PD750, PD751, PD752 Universal Temperature Meters To re-install the meter in its case: 1. Fold the Options Board over the Main Board, grasp both boards so the Main Board is on the bottom and the two Boards are separated by about an inch. 2. Insert the two boards together into the case. Be sure both the top and bottom boards engage the rails, which hold them in place. 3. Do not press on the Display Board when seating the assembly in the case. 4.
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Model PD750, PD751, PD752 Universal Temperature Meters Instruction Manual How to Contact Precision Digital • For Technical Support please call: (800) 610-5239 or (508) 655-7300 fax: (508) 655-8990 e-mail: support@predig.com • For Sales Support or to place an order please call: (800) 343-1001 or (508) 655-7300 fax: (508) 655-8990 e-mail: sales@predig.com • For Extended Warranty, Setup & Calibration Services please visit www.predig.com • For an online version of this instruction manual please visit www.
