Section 11
Model 601/601P/602/602P/603 NDIR Analyzer
California Analytical Model 600_NDIR_Series_v10.0 CE
Operators Manual
Page 68 of 86
11. ADJUSTMENTS CHECKS AND REPAIRS
11.1. Adjustment of Detector Voltage (NDIR’S only)
Note: Adjustment is required if detector or NDIR amplifier board is replaced. Important:
Turn RP2 to its maximum counter clockwise position before initial power up of a
replacement detector or NDIR.
The detector operating voltage is specified on the label attached to the side of the detector
below the Serialization Number and Type designation. On the NDIR amplifier board, the
voltage supplied to the detector can be measured between TP-1 (+) and TP-9 (common).
Adjust RP2 to achieve the voltage specified on the detector to within 0.001 VDC.
WARNING: The detector may be damaged if the applied voltage is excessive. For this
reason, it is recommended to adjust RP2 to its maximum counter clockwise position
before initial power up of a replacement detector or NDIR amplifier board.
11.2. Coarse Zero Adjustment
With zero gas still flowing connect a DC voltmeter to TP7 (+) and TP9 (common). Switch JP8
to the on position and leave JP6 and JP7 in the off position. The target DC voltage for TP7 is
0mV. Adjust RP5 first and use RP3 for the final adjustment.
11.3. Span Gain Adjustment
With a full-scale span gas flowing connect a DC voltmeter to TP8 (+) and TP9 (common). The
target voltage for TP8 with a full-scale span gas flowing is 8.00VDC. Turn RP4 fully clockwise
(12 turns). To achieve this voltage select a resistor value, or combination of values to install
into R30, R35, R36, and / or R37. Set the corresponding Jumper (JP9-JP12) to the on
position for each resistor used to set the gain. The value needed may range between 1K and
100K ohms. A smaller resistor value increases the gain and achieves a larger DC voltage at
TP8 when span gas is flowing. RP6 can be used to make a small gain adjustment when the
target voltage is close. When finished setting the gain adjustment, flow zero gas again and
repeat the previous to step to achieve a good zero at TP8.
Summary of Contents for 600-NDIR
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