VELTRON DPT 2500-
plus
Air Monitor Corporation
116-047-20.PMD (5/5/11)
VELTRON DPT 2500-
plus
- IO&M Manual
29
8 – TROUBLESHOOTING
SECTION 8 – TROUBLESHOOTING
Personnel should be familiar with the operation of the VELTRON DPT 2500-
plus
(see Section 5) before performing
any troubleshooting.
Note: Prior to performing any troubleshooting, turn power OFF. After 10 seconds, turn power switch ON. If
problem still exist
s
, proceed with troubleshooting step
s
.
Problem
No Display and "CPU
Activated" • is not blinking.
No output or incorrect output
with display responding
correctly to process change.
Both output and display are
incorrect or not responding to
process change.
AUTO-zero Function
is not working.
is
continuously lit.
is flashing
rapidly.
Process Signal is Unreliable
is displayed on Line 1 of
display.
Solution
– Verify input power is present at the correct voltage as listed on label at the Power
Te
rminals.
– Check fuse F1 (1 amp) (see Figure 4.2 for location).
– Review Factory Set-Up Information Sheet for type of output (4-20mA, 0-5V or 0-10V).
– Check analog output terminal strip wiring for proper installation.
– Perform Transmitter Output Calibration (see Section 6).
– Verify pressure signal lines are connected correctly.
– Verify AUTO-zero valve switch is in the OFF position.
– Check for leaky or obstructed lines between VEL TRON DPT 2500-
plus
and process sensor.
– Disconnect pressure signal lines and apply light finger pressure to "High" port while monitoring
analog output for change. If no change, contact Factory for further information.
– Verify AUTO-zero is ON and interval is properly set (see Section 5.9).
– Verify AUTO-zero valve switch is in the OFF position.
– Zero value measured during AUTO-zero cycle is between 90% and 100% of operating sp
a
n.
Transmitter Input Calibration should be performed as soon as possible (see Section 6.3).
– Zero value measured during
A
UTO-zero cycle is greater than 100% of operating sp
a
n.
Transmitter Input Calibration should be performed immediately (see Section 6.3).
– Verify pressure signal lines are connected correctly (see Section 4.4).
– Verify process is operating within design parameters specified on Factory Set-Up Sheet.
– Verify pressure signal line bulkhead fittings on the transmitter housing have not been spun
causing internal signal tubing to twist.
If after following the Troubleshooting steps the VELTRON DPT 2500-
plus
continues to
operate improperly, contact the Service Department for further assistance (see Section 10).
auto zero
auto zero
Summary of Contents for VELTRON DPT 2500-plus
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