Specifications

Multi-Zone Gas Monitors
P/N: 3015-5074 Rev 10 37
4.5.2. Navigating to the Fault Screen
Displayed on the initial Data Display Screen is a Fault option. Scroll down with the cursor key and select
this option, which will introduce you to the Fault Screen.
Figure 4-7. Fault Screen
4.5.3. Critical Faults
Fault Code Description / Possible Causes
NO FLOW ON ZONE <0800>
Go to the Data Display Screen and press the FAULT key. This will display
a “NO FLOW” message in each individual zone affected. Check for a
blockage in the air sample line or at the line end filter. Once the blockage
has been cleared, the MZ monitor will return to normal operation after the
zone has been sampled.
NOTE: This can take some several minutes since it is
dependent upon how many zones there are and their
lengths. The MZ will clear the fault the next time it
polls the effected zone and the RD will return to
normal operation the next time that it polls the MZ.
NO FLOW ON PURGE <1000> Check the purge line for a blockage. Verify that the length of the purge line
and exhaust line do not exceed 500 feet in length.
CLIPPING FAULT <8000> The detector voltage may be out of tolerance. For information on
troubleshooting this type of fault, refer to section 5.3 on page 50.
REZERO VOLT TOL <4000> The detector output voltage is out of tolerance. For information on
troubleshooting this type of fault, refer to section 5.3 on page 50.
OVER RANGE
DETECTED
<2000> This indicates that the measured concentration on one or more zones have
exceeded the measurement range. For information on troubleshooting this
type of fault, refer to section 5.3 on page 50.
ZERO FILTER FAULT <0100> Indicates contamination in the purge air, or if a charcoal filter is in use, the
filter may need to be changed.
GAIN SET FAULT <0200> Indicates sensor gain (digipot) is outside acceptable range. For
information on troubleshooting this type of fault, refer to section 5.3 on
page 50.
A2D FAULT <0400> Analog to digital converter not working.