VELTRON DPT
Air Monitor Corporation
116-009-70.P65 (09/18/09)
VELTRON DPT - IO&M Manual
6.3 – TRANSMITTER CALIBRATION
The VELTRON DPT output and optional display will be calibrated for minimum and maximum full scale differential
pressure.
6.3.1
For units with unipolar positive or negative differential pressure spans.
1. At the Terminal board, connect DMM, set to read to the nearest 0.001VDC, across test points
TP0 GND
(black) and
TP1 XMIT
(brown). See Figure 4.5.
2. With zero input pressure to the VELTRON DPT, verify the DMM reads 0.000 ±0.001VDC. If adjustment is
required, adjust
XMIT ZERO
(R5 on Terminal board) as needed.
3. Verify the LCD display (if so equipped) reads 000 ±001. Adjust as necessary using
ZERO
(R9 on Display
board, see Figure 6.2).
Figure 6.2
4. Connect DMM, set to read to the nearest 0.01mADC, to terminals
±TEST OUTPUT
on Terminal board.
DMM should read 4.00 ±0.01mADC. Adjust as necessary using
OUTPUT ZERO
(R4 on Terminal board).
5. Apply input pressure (as read on manometer) to the High port of the VELTRON DPT. Adjust pressure
according to the following:
– For Positive differential pressure spans. The maximum calibrated span value as indicated on the Factory
Set-Up Information Sheet.
– For Negative differential pressure spans. The positive equivalent of the maximum negative calibrated
span value as indicated on the Factory Set-Up Information Sheet.
6. Verify DMM at
±TEST OUTPUT
terminals read 20.00 ±0.01mADC. Adjust as necessary using
XMIT
SPAN
(R3 on Terminal board).
7. Verify the LCD display (if so equipped) reads the desired full scale value. Adjust as necessary using
SPAN
(R1 on Display board) until desired reading ±001 is achieved.
8. Repeat Steps 1 through 7 as necessary until no further adjustments are required to either zero or span.
9. Remove test equipment and replace terminal side and circuit side covers, taking care to ensure proper
seal.
12
SECTION 6 – CALIBRATION
Содержание AMC POWER VELTRON DPT
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