AirTest CN9000 Series Handbuch - Seite 4

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CONTROLLER CALIBRATION

1. ALARM TRIP POINT ADJUSTMENT – By Voltage

To Set Alarm Trip Points

Step 1: Open the inner cabinet door of the Model 9000 controller to allow access to alarm adjustments.

Step 2: Using a voltmeter, connect to the black and the yell o w (RTP1) testpoints.

Step 3: Adjust the RTP1 potentiometer until the DVM reads the desi r ed value as recorded when cali b ration gas

was applied to the sensor.

The Input Module is normally set to operate from 0.4 to 2.0 VDC which is a direct correlation to the 4 mA

to 20 mA signal produced by a 4-20 transmitter. This allows for easy calculation of alarm set points. The

0.4 to 2.0 volts corresponds to 0 ppm to max range ppm or in the case of the TR2000 0 – 200ppm CO.

2. ALARM TRIP POINT ADJUSTMENT – By Calibration Gas

Step 1: Open the inner cabi n et door of the Model 9000 controller to allow access to low and high alarm

potentiometer adjustments.

Step 2: Appl y to the sensor, cali b ration gas of a concentrati o n desi r ed for low alarm relay acti v ation.

Step 3: Adjust applicable "RTP1" potentiometer until the low alarm relay acti v ates. (listen for "click" or watch relay

acti v ation lights on the Output Module)

Step 4: Redo steps 2 & 3 for the high alarm using cali b ration gas of a concentrati o n desi r ed for high alarm relay

acti v ation.

Step 5: Repeat steps 2 through 4 for each channel.

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