N
2
O Portable Monitor
Operation
Instruction 3015-4787
15
3.10.4 Fault Codes
FAULT CODES ARE ADDITIVE
. For example:
A fault code of <0003> indicates that both a Box
Temperature Fault <0001> and a Bench Temper-
ature Fault <0002> have occurred.
<0001> Box Temperature Fault:
Enclosure
temperature is outside normal range (or IR detector
has failed). Check that the monitor is not being
subjected to extreme temperatures. Use the
DIAG
function to check the Box Temperature.
<0002> Bench Temperature Fault:
Optical
bench is outside normal operating range (or IR
detector has failed). Check that the monitor is not
being subjected to extreme temperatures.
<0004> Manifold Pressure Fault:
The manifold
pressure is outside its normal operating range (or
IR detector has failed). Enter the
DIAG
function and
record ALL data. Call the factory with this
information for further instructions.
<0040> Fill Flow:
The purge-air bag’s pressure
drop is outside expected limits. Use the
EMTYBAG
and
FILLBAG
functions to refill the purge-air bag. If
the fault still occurs, check for a punctured bag or
disconnected tubing.
<0080> Over Range Fault:
Monitor exposed to a
gas level that exceeded 65,000 ppm.
<0100> Zero Filter Fault:
The air-purge bag is
contaminated with gas. Take monitor to a clean-air
area and use the
EMTYBAG
and
FILLBAG
functions
several times to decontaminate the purge-air bag
.
<0200> Gain Set Fault:
The digipot autotune
sequence has failed. This fault will only occur on
first boot up or after a firmware upgrade. Call the
factory for further instructions.
<0400> A/D Fault:
A fault has occurred in the
analog-to-digital circuitry. Contact the factory with
this information for further instructions.
<0800> Sample Flow Fault:
Check for:
A restriction in the gas-sample inlet or exhaust; a
blocked internal filter; or a failed pump.
<1000> Purge Flow Fault:
Check for:
A restriction in the gas-sample exhaust; a blocked
internal filter; or a failed pump. Once the purge air
stream has been restored, the monitor will return to
normal operation after it completes a purge cycle.
<2000> Bag Fill Time:
The purge-air bag did not
fill within the expected time allotment, or too many
purge cycles occurred indicating a leak in the purge-
air system. Check for a punctured bag or
disconnected tubing.
<4000> Zero Range Fault:
The IR detector’s
output voltage is out of tolerance. Enter the
DIAG
function and record all data. Call the factory with
this information for further instructions.
<8000> Clipping Fault:
The detector voltage may
be out of tolerance. Use the
DIAG
function to check
the IR detector voltage. Call the factory with this
information for further instructions.
