RKI Instruments 65-2658XL-CH4-4, Руководство оператора

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65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual Chapter 7: Maintenance • 37
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 6 months is adequate for most infrared methane transmitter
applications. Unless experience in a particular application dictates otherwise, RKI Instruments,
Inc. recommends a calibration frequency of every 6 months.
If an application is not very demanding, for example detection in a clean, temperature controlled
environment where calibration adjustments are minimal at calibration, then a calibration
frequency of every 9 to 12 months is adequate.
If an application is very demanding, for example if the environment is not well controlled, then
more frequent calibration than every 6 months may be necessary.
Determining Response Time
Since the detector junction box is installed remotely from the M2A-XL, the response time of the
detector will depend on the length of flexible tubing that is attached to the calibration adapter/
splash guard. To determine the response time based on the length of tubing connected:
1. Place the M2A-XL into its calibration mode or disable external alarms.
2. Note the current gas reading displayed at the M2A-XL.
Slow or No
Response/
Difficult or
Unable to
Calibrate
• Unable to
successfully set the
fresh air or span
reading during
calibration.
• M2A-XL requires
frequent
calibration.
NOTE: See
“Calibration
Frequency” on
page 37 for
calibration frequency
guidelines.
• The calibration
cylinder is low, out-
dated, or defective.
• The calibration gas
flow rate is too low.
• The calibration gas is
not an appropriate
concentration.
• The detector is
malfunctioning.
• The terminal PCB is
malfunctioning.
• The flexible tubing
to the calibration
adapter/splash guard
has become kinked,
blocked, or
disconnected.
1. Verify that the calibration
cylinder contains an adequate
supply of a fresh test sample.
2. Verify that the regulator used for
calibration is a 0.5 LPM
regulator.
3. Verify that the calibration gas
concentration is appropriate for
the transmitter. The concentration
should be in the detection range,
preferably about half of the
detection range.
4. Verify that the flexible tubing to
the calibration adapter/splash
guard is clear and connected to
the calibration adapter/splash
guard.
5. If the calibration/response
difficulties continue, replace the
detector.
6. If the calibration/response
difficulties continue, contact RKI
for further instruction.
Table 7: Troubleshooting the IR CH
4
Detector (Continued)
Condition Symptom(s) Probable Causes Recommended Action