AMC AMC-360-IREP Manuale di istruzioni - Pagina 12
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5 OPERATION AND CALIBRATION
5.1 OPERATION
The AMC-360-IREP series transmitter/sensor unit is factory calibrated for the gas listed in
section 3.1 GENERAL DESCRIPTION. The unit should not need recalibration when first
installed and powered up, but a test for correct operation is recommended. All testing should be
done after a stabilization period of 20 seconds.
In general, after the stabilization period, the transmitter should be sending (in a clean air
environment) a signal of approximately 4 mA to the monitor or controller. However, there are a
few situations where a slightly higher or lower than normal signal may be noticed. In many
facilities there are residual background gases (including the gas being detected) in the air at all
times. These can cause a minor response from the sensor, normally causing a rise in signal.
Other causes for minor signal variations include extremes in temperature. In the case of large
signal variations (in a clean environment), check for an installation problem or the possibility of
an interference gas being present.
5.2 CALIBRATION
The transmitter is equipped with a remote calibration feature allowing one-man calibration at the
transmitter location.
Calibration Lead" (P/N 2900-01) designed to be adaptable to most multimeters. Zero and span
adjustments are made at the transmitter. Recalibration is necessary when replacing the sensor.
Verification of calibration should be done at least once every 6 months for safety reasons and
for highly demanding applications, monthly verification is recommended.
Factory/on-site calibration services, customer training and/or calibration adapter are available.
Specify the sensor/transmitter Part Number & Serial Number listed in section 2.1
SENSOR/TRANSMITTER and refer to section 2.2 FACTORY CALIBRATION for Gas Type and
calibration adapter when ordering any of the above.
Caution:
Only qualified personnel should perform the actual calibration. Users are advised to
consult the Armstrong Monitoring Corporation as to the recommended calibration gas
concentration for the application, and any other questions.
5.2.1 EQUIPMENT REQUIRED
•
Digital multimeter
•
"Remote Calibration Lead" provided with the transmitter
•
"Trimmer Adjustment Tool" or miniature screwdriver
•
Calibration adapter
•
Zero & Span gases and regulator (Contact factory for information)
The transmitter output is measured using a "plug-in" type "Remote
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