MVR-300™ Refrigerant Gas Detector
26
P/N: 6203-9000 Version 1
5.2.5
Bump Test
A bump test is a live test of a system to verify that the detector responds to gas and all connected alarm
devices, BMS, etc. are operating accordingly. In this case it is necessary that all involved persons are
informed about the test and certain alarms might have to be inhibited (e.g., shutdown valves, notification
of authorities, etc.).
Step
Description
1.
Inform building personnel of test so that certain alarms may be inhibited (e.g., shutdown
valves, notification of authorities, etc.).
2.
Connect adapter and target gas according to instructions in Section 5.2.2: General Calibration
Procedure on page 24.
3.
Apply a sufficiently high concentration of target gas to trigger alarms, but not pure refrigerant or
hydrocarbons (e.g., do not use a butane lighter), as this might damage the sensor.
4.
Once the alarm thresholds are exceeded, all designated gas alarm relays will be activated and
the digital outputs will transmit the corresponding gas concentrations.
5.
Turn off gas flow and remove calibration adapter.
5.3
Troubleshooting
5.3.1
Failed Span Adjustment
Step
Description
1.
Remove bezel and face plate.
2.
Attach calibration adapter.
3.
Configure voltmeter to measure 0 to 5 VDC.
4.
Insert voltmeter probes into the marked test points.
5.
Tap and hold (
●●) for more than 5 seconds.
6.
The LED will blink green-green-orange to indicate the detector is ready.
7.
Apply span gas in the concentration listed on the cal gas concentration label on the detector
base.
8.
Tap (
●●) within 30 seconds confirm to initiate calibration. Otherwise the
detector will time-out
and return to normal operation.
9.
While gas is being applied the analog output will generate a voltage proportional to the
measured gas concentration. For example, for a 5,000 ppm span detector, applying 2,500 ppm
cal gas should, once stable, result in a 2.5 VDC reading.
𝑅𝑒𝑎𝑑𝑖𝑛𝑔
= 5 ×
2500
5000 = 2.5
𝑉𝐷𝐶
10.
As the process progresses, the LED will blink green-orange, green-orange-orange, green-
orange-orange-orange, etc.
11.
To abort the calibration tap and hold (
●●) for more than 5 seconds.
12.
The LED will blink green-orange-red indicating “offline”.
13.
Turn off gas flow and remove the calibration adapter from the detector.
14.
The detector will return after 6 minutes (typical) to normal operation.
15.
If the calibration was successful, skip the next step.
16.
If the calibration was not successful, the orange LED will blink at 2 Hz.
17.
Tap (
●●) to discard the calibration attempt.
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