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VELTRON DPT-
plus
Air Monitor Corporation
116-010-91.P65 (09/18/09)
VELTRON DPT-
plus
- IO&M Manual
SECTION 6 – CALIBRATION
47
6.3 – TRANSMITTER INPUT CALIBRATION
6.3.1
For Units With Positive or Negative Differential Pressure Spans.
Zero pressure and transducer natural span pressure will be applied to the VELTRON DPT-
plus
, unit will be programmed
to recognize these pressures as zero and span for transmitter input calibration.
1. While in Main Menu, scroll to:
Transmitter Input
Calibration
2. Press , and display will indicate:
Transducer Zero
Calib: 0.00 in.WC
3. Press , and display will indicate:
Transducer Zero
-- Push ENTER --
4. Slide switch S1 - "AZ Valve" to the ON position.
5. Press , and display will indicate:
Transducer Zero
Settle Time:4
Display will count down to 0, after which it will indicate: Input Zero Done
-- Push ESCAPE --
Display will count down to 0, after which it will indicate: Input Span Done
-- Push ESCAPE --
Note:
If pressure input is less than 40% or greater than 110% of transducer's Natural span value (see
Factory Set-Up Information Sheet), display will indicate:
Bad Input Span
-- Push ESCAPE --
If this occurs, check input pressure (as read on manometer), and readjust as necessary. Press and
repeat Steps 7 through 10.
6. Press and then , display will indicate:
Transducer Span
Calib: X.XX in.WC
7. Slide switch S1 - "AZ Valve" to the OFF position.
8. Apply input pressure (as read on manometer) to the High port of the VELTRON DPT-
plus
. Adjust pressure
to equal the transducer natural span value, which is indicated on the display.
9. Press , and display will indicate:
Transducer Span
-- Push ENTER --
10. Press , and display will indicate:
Transducer Span
Settle Time:4
X
X