5.0 ADJUSTMENTS

5.0 ADJUSTMENTS

CAUTION

RISK OF ELECTRICAL SHOCK. THE OPERATIONS

OUTLINED IN THE FOLLOWING SECTIONS OF THIS

CHAPTER ARE TO BE PERFORMED BY QUALIFIED

MAINTENANCE PERSONNEL ONLY!

5.1 Calibration

The Model 450H is calibrated using a wet chemistry method (double buffered KI) prior to shipment. The M450H should operate for extended periods without calibration.

5.2Changing the analog output range

5.2.1Voltage output

Output voltage ranges are set by DIP switches on the V/F board. To change the range for the analog output:

1.Turn off instrument power. Remove instrument cover. Locate the V/F board near the front of the analyzer using Figure 1.6.

2.Locate switch S1, along the top edge of the card. Select the desired range per Table 4.2 below.

3.Recalibrate the ADC as described in Section 5.3.

Full Scale Output
Switch Settings

100 mV

1,6 = ON

1 V

1,5 = ON

5 V

1,4 = ON

10 V

1,3 = ON

TABLE 4.2 V/F BOARD DIP SWITCH - RANGES FOR ANALOG OUTPUT

5.2.2 Current Output (Optional)

To configure the M450H for 4-20mA current output, perform the following steps:

1.Set the analog voltage range to the 5 Volt scale as described in Section 5.3.1 above.

2.Install Jumper in J2 on the rear panel PCB assembly.

3.Set Jumpers JP3 and JP4 on the rear panel PCB assembly as shown in Figure 4.2 below.

P/N 02826B1 Teledyne API Model 450H O3 Monitor Instruction Manual - Page 41

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Teledyne 450H Adjustments, Calibration, 5.2Changing the analog output range, 5.2.1Voltage output, Current Output Optional