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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
6.3 – TRANSMITTER INPUT CALIBRATION (con't)
6.3.2
For Units With Bi-Polar Spans.
Minimum and maximum 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. Connect input pressure to Low port of VELTRON DPT-
plus
.
Transmitter Input
2. While in Main Menu, scroll to:
Calibration
3. Press , and display will indicate:
Transducer Zero
Calib: –X.XX in.WC
4. Slide switch S1 - "AZ Valve" to the OFF position.
5. Apply input pressure (as read on manometer) to the Low Port of the VELTRON DPT-
plus
. Adjust
pressure to equal the positive equivalent of the minimum (negative) transducer natural span value, which
is indicated on the display.
6. Press , and display will indicate:
Transducer Zero
-- Push ENTER --
7. 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 --
49
8. Press and then , display will indicate:
Transducer Span
Calib: +X.XX in.WC
9. Connect input pressure to the High port of the VELTRON DPT-
plus
.
10. Apply input pressure (as read on manometer) to the High Port of the VELTRON DPT-
plus
. Adjust
pressure to equal the maximum (positive) transducer natural span value, which is indicated on the
display.
11.Press , and display will indicate:
Transducer Span
-- PUSH ENTER --
12. Press , and display will indicate:
Transducer Span
Settle Time:4
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 maximum (positive) Natural
span value range (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 9 through 12.
X
X