AMC 350 Instructions Manual - Page 13

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5 OPERATION AND CALIBRATION

The AMC-350 series sensor/transmitter unit is factory calibrated for the gas listed in Product

Information (section 2). The unit should not need recalibration when first installed and powered

up, but a test for correct operation is recommended.

stabilization period.

In general, after the stabilization period, the transmitter should be sending (in a Zero gas

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 can be residual levels of 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.

The sensor/transmitter is equipped with a remote calibration feature allowing one-man

calibration at the transmitter location. The transmitter output is measured using a plug-in type

"Remote Calibration Lead" 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

calibration procedure and recommended gas concentration for the application.

•

Digital multimeter

•

Remote Calibration Lead (provided with the transmitter)

•

Trimmer adjustment tool or miniature screwdriver

•

Calibration adapter

•

Zero & Span gases and Permeation tube (Contact factory for information)

AMC-350 Sensor/Transmitter

All testing should be done after a