AMC 2751 Gebrauchsanweisung - Seite 13
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Seite drucken5 OPERATION AND CALIBRATION
5.1 OPERATION
The AMC-2751 sensor/transmitter is factory calibrated for the gas listed in the Product
Information (Section 2) at the beginning of this manual. The sensor/transmitter should not
require re-calibration when first installed and powered up, but a test for correct operation is
recommended after a stabilization period of 30 minutes.
In clean air, after the stabilization period, the transmitter should be sending a signal of
approximately 4 mA to the monitor or controller. It can be expected, in most cases, that
presence of CO will be indicated. Background air contains 1-3 ppm of CO typically.
Although the electrochemical sensors are very selective, there are some interference gases,
which can also cause a response from the sensor. See section 4.1 for list of interference gases.
In the case of large signal variations (in a clean air environment), check for an installation
problem or the possibility of an interference gas being present.
5.2 CALIBRATION
Every AMC-2751 sensor/transmitter is factory calibrated, so each unit should be ready for
operation after installation and a 30 minute stabilization time.
Subsequent calibration is required as a part of regular maintenance, and when replacing the
sensor. See the maintenance section of this manual for the recommended calibration schedule.
Caution:
- Only qualified personnel should perform the actual calibration.
- Users new to gas calibration are advised to consult with Armstrong Monitoring
The Armstrong Monitoring Corporation offers the following plans:
1. Factory pre-calibrated replacement sensor/transmitter units
2. On site installation and calibration by Armstrong Monitoring
3. On site calibration by Armstrong Monitoring
4. Training by Armstrong Monitoring
5. Extended warranty calibration program
AMC-2751 Transmitter & Sensor
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