Macurco GDH-FCK, GDP-FCK, GDM-FCK User Manual

Macurco™ Combustible Gas Detector, Field
Calibration Kit GD6-FCK

General

The GD-6 can be bump-tested or calibrated with the GD6-FCK with Methane, Propane or Hydrogen gas, regulator and
test hood, available through your local repr esentative or from Macurco.

Contents of the FCK

• GDM-FCK: Two Gas Cylinders, 10% LEL Methane gas in air, 20% LEL Methane in air, Gas regulator with two feet of
plastic tubing, Humidifier and Gas test hood

• GDP-FCK: Two Gas Cylinders, 10% LEL Propane gas in air, 20% LEL Propane in air, Gas regulator with two feet of
plastic tubing, Humidifier and Gas test hood

• GDH-FCK: Two Gas Cylinders, 10% LEL Hydrogen gas in air, 20% LEL Hydrogen in air, Gas regulator with two feet
of plastic tubing, Humidifier and Gas test hood

FCK Information

Several detectors can be calibrated with one FCK. The on ly limitation is the amount of gas in the cylinder. The 17 liter
cylinder with 0.2 LPM (Liters Per Minute) regulator has approximately 85 minutes of continuous calibration run time.
Replacement cylinders are availabl e. The gas cylinder should be replaced when the pressure gauge on the regu lator
shows 25-psi or less.

Note: For optimum test results it is suggested that the unit be in clean air (green light on) and be in a low
ambient air flow

Gas Testing
Testing the Fan Relay
Note: The gas concentration to activate the fan relay depends on the setting.

1. Remove the Philips screw on the front of the GD-6. Remove the front cover.

2. Connect the 10% LEL cylinder of Combustibl e Gas to th e regulator. E nsu re that the gas used for ca libratio n matc hes
the gas selected in the GD-6 configuration.

3. Assemble regulator, hose and test hood and place the test hood over the gas sensor.

4. Check the pressure gauge on the regulator. If you have 25-psi or less you will need to replace the g as canister.

Note: The time to activate the fan relay depends on the delay setting.

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5. Turn on the regulator to start the gas flow and wait with the gas applied continuously.

6. With the display function turned “On”, the GD-6 will show the current concentration of gas or “0” (zero) in
clean air. When the gas concentration reaches the fan relay setting (5% LEL, for example) the display will
flash back and forth between “FAn” and “5”. With the display function turned ”Off”, the display does not
show the gas concentration, but will show “FAn” as long as the fan relay is activated.

Note: If the Fan relay does not close within 2 minutes, consider these possibilities:

a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (go through recalibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has fan relay set to disable (OFF) or 20% LEL. Set fan relay to 5% LEL and repeat the

test.

7. Remove the gas from the sensor. Proceed to test the alarm relay or replace the top cover.

Testing the Alarm Relay
Note: The gas concentration to activate the Alarm relay depends on the setting.

Connect the 20% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration
matches the gas selected in the GD-6 configuration.

1. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.

2. Place the test hood over the gas sensor. Turn on the regulator to start the gas flow.

3. The Fan relay should activate according to the settings.

4. With the display function turned “On” and the gas concentration reaching the Alarm Relay setting, (20%
LEL, for example) the display will flash back and forth between “ALr” and “20”. The buzzer will sound
indicating “Alarm” if the buzzer is turned “On”. With the display function turned off the display does not
show the gas concentration, but will show “ALr” when the Alarm relay is activated.

5. Note: If the Alarm relay fails to operate within 2 minutes, consider these possibilities:

a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (go through recalibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has Alarm relay set to disable (OFF). Set Alarm relay to 20% LEL and repeat the test.

6. Remove the gas from the sensor after test. Proceed to test the 4-20 mA output or replace the top cover.

Testing the 4-20 mA current loop

Connect the 20% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration
matches the gas selected in the GD-6 configuration.

1. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.

2. Place the test hood from the regulator over the gas sensor. Turn on the regulator to start the gas flow.

3. The fan relay should activate according to the settings.

4. The alarm relay should activate according to the settings.

5. The 4-20 mA output should ramp up from 4mA in clean air to 20 mA at 50% LEL. See 4-20 mA diagram in
these User Instructions.

Note: If the 4-20mA output does not ramp up within 2 minutes, consider these possibilities:

a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (go through recalibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has 4-20 mA option set to “OFF”. Set 4-20 mA option to “On” and repeat the test.

6. Remove the gas from the sensor. Re-assemble the GD-6 (make sure the LED is aligned with the hole on
the front of the case).

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