Macurco™ GD-12 Combustible Gas Detector, Controller and Transducer User Instructions Important: Keep these User Instructions for reference
TABLE OF CONTENTS GENERAL SAFETY INFORMATION Intended Use List of Warnings and Cautions USE INSTRUCTIONS AND LIMITATIONS Use For Do Not Use For General Description Features Specifications INSTALLATION AND OPERATING INSTRUCTIONS Location Connections Installation 4-20 mA Output diagram Rear View Image Gas Valve Control diagram Multiple Device diagram Alternate Alarm Panel diagram DVP-120 Control Panel diagram Power Up Operation Default - Factory Settings Display setting Buzzer setting Alarm Relay setting Alar
GENERAL SAFETY INFORMATION Intended Use The Macurco GD-12 is a line voltage, dual relay Combustible Gas detector, controller and transducer. The GD-12 utilizes an internal switching power supply that is capable of using line voltage between 100 and 240VAC and 50-60Hz. The GD-12 has selectable 4-20 mA output, buzzer and digital display options.
USE INSTRUCTIONS AND LIMITATIONS ! WARNING Each person using this equipment must read and understand the information in these User Instructions before use. Use of this equipment by untrained or unqualified persons, or use that is not in accordance with these User Instructions, may adversely affect product performance and result in sickness or death.
Features ETL Listed to UL 61010-1 and CAN/CSA C22.2 No 61010-1 Low level meter capable of displaying from 0-50% LEL Selectable target gas – Methane(NG), Propane(LP) or Hydrogen(H2) Selectable fan and alarm relay activation 5 A SPDT fan relay controls starters of exhaust fans 0.5 A N.O. or N.C.
! WARNING This detector helps monitor for the presence and concentration level of a certain specified airborne gas. Misuse may produce an inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and cause sickness or death. For proper use, see supervisor or User Instructions, or call Technical Service at 1-877-367-7891. Location A GD-12 mounting height is dependent upon the target gas.
into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be pulled from the connector. Plug the modular connection into the Fan/Power connection and ensure that it latches into the header properly. Alarm Relay Connection The external alarm connections (A and B) are available at the Alarm modular connector. There is no polarity for these connections. To install the wiring for the alarm contacts disconnect the connector from the header on the detector.
7. Note that the “disable” fan setting will cause the fan relay to not engage. The fan relay will engage in trouble fault condition (if the Trouble Fan Setting Option is set to “ON”) and will disengage once trouble fault condition is cleared.
Typical connection to the Macurco DVP-120 Detection and Ventilation Control Panel Power Up The GD-12 cycles through an internal self-test cycle for the first minute that it is powered. The unit will execute the test cycle any time power is dropped and reapplied (i.e. power failure). During the self-test cycle the unit will display the firmware version number, then count down from 60 to 0 (if the display setting is “On”) and finally go into normal operation.
Default Configuration – Factory Settings The default Gas setting is ME (methane) The default Power Up Test setting is On The default Display setting is Off The default Buzzer setting is Off The default Alarm Relay Setting is activation at 20% LEL The default Alarm Relay Configuration is Normally Open The default Fan Relay Setting is activation at 10% LEL The default Fan Relay Delay setting is 3 minutes The default Fan Relay Runtime setting is 0 The default Fan Relay
To select the Default Configuration, in normal mode, press the Next button twice to get to “Con” or the Configuration menu. Then press the Enter button to enter the Con menu. The first selection is the “dEF” or Default setting. Press Enter. If it is already in Default configuration, there will be no action. If it is not already in Default configuration, “nO” will be displayed.
Selecting Fan Relay Delay – “Frd” To select the Fan Relay Delay setting, in normal mode, press the Next button twice to get to “Con” or the Configuration menu. Then press the Enter button to enter the Con menu. The eighth selection is the “FrD” or Fan Relay Delay. Press Next seven times to get to “FrD” then press Enter.
precaution. To clear this mode, simply turn off power to the unit for a few seconds, or push the ENTER/TEST switch (inside the unit). This will cause the unit to restart the 1 minute self-test cycle.
The GD-12 has a long life, non-replaceable catalytic bead sensor. Five (5) years after the GD-12 is installed the sensor end-of-life signal will be activated indicating that the GD-12 has reached the end of its typical usable life. The end-of-life signal will cause an error code t200 “Sensor expired”. See Error Codes section. The end-of-life signal can be silenced for 48 hours by pressing the "ENTER/TEST" button or by temporarily dropping power to the unit.
General All GD-12 units are factory calibrated and 100% tested for proper operation. During normal operation the green status indicator LED light will be on steady, the fan & alarm relay will be in standby mode and the 4-20 mA output will be at 4mA (in clean air).The unit also performs a regular automatic self-test during normal operation. If the unit detects an improper voltage or inoperable component, it will default into Error mode.
42t - 420 loop test, 25 seconds gtS - Gas Test, 3 minutes (no output to the panel during the gas test) The display will flash during the test or in the case of the gas test the level will alternate with the expected gas (mE, Pro or Hy). Once the test is complete, the display will return to steady display. To exit the test menu, press the Next button until “End” is displayed, then press Enter to return to normal mode.
FCK Information Several detectors can be calibrated with one FCK. The only limitation is the amount of gas in the cylinder and the flow of the regulator. The 34 liter cylinder for example with a 0.2LPM regulator has approximately 170 minutes of continuous calibration run time. Replacement cylinders are available. The gas cylinder should be replaced when the pressure gauge on the regulator shows 25-psi or less.
a. b. c. d. 7. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less. Unit needs to be re-calibrated (go through recalibration and re-test). Detector is in need of servicing (return unit to factory for servicing). Detector has fan relay set to disable (OFF) or 20% LEL. Set fan relay to 5% LEL and repeat the test. Remove the gas from the sensor. Proceed to test the alarm relay or replace the top cover.
b. c. d. 6. Unit needs to be re-calibrated (go through recalibration and re-test). Detector is in need of servicing (return unit to factory for servicing). Detector has 4-20 mA option set to “OFF”. Set 4-20 mA option to “On” and repeat the test. Remove the gas from the sensor. Re-assemble the GD-12 (make sure the LED is aligned with the hole on the front of the case). Quick Gas Test A butane cigarette lighter can be used to perform a functionality test of the GD-12.
Calibration 1. Remove the Philips screw on the front of the GD-12. Pull the front cover of the unit off. 2. Assemble the 10% LEL gas cylinder and regulator together. Ensure that the gas used for calibration matches the gas that the GD-12 is configured to (mE, Pro or Hy). 3. Check the pressure gauge on the regulator. If you have 25-psi or less you will need to replace the gas canister. 4. Place the test Hood from the regulator over the gas sensor. 5.
MACURCO FIXED GAS DETECTION PRODUCTS LIMITED WARRANTY Macurco warrants the GD-12 gas detector will be free from defective materials and workmanship for a period of two (2) years from date of manufacture (indicated on the inside cover of the GD-12), provided it is maintained and used in accordance with Macurco instructions and/or recommendations.
