MSA Ultima User Manual

Table 4-1. Troubleshooting Guidelines
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
Unit will not
power up
properly
Insufficient voltage or current
from power supply.
Incorrect wiring connections.
Wire strands touching at input
terminal block.
Check power supply and
interconnecting wires.
Display
shows CAL
FAULT
Cell signal too low or too high
during calibration.
Unstable calibration signal.
Check calibration gas and flow system;
then, recalibrate (valid calibration or
Initial Calibration will clear display).
Old or damaged cell.
Replace cell and perform Initial
Calibration.
(If original cell is new, an Initial
Calibration alone may solve the problem.)
Failed autocal calibration
If unit is incorrectly set up for autocal,
disable the autocal mode by setting
Future Calibration Date to 12-31-1993;
check the autocal flow system.
Jumper setting changed.
For IR Combustibles, check Jumper JP1
on the printed circuit board with power
connection. JP1 should not be installed
for methane detection. JP1 should be
installed for non-methane hydrocarbon
detection. Incorrect setting may lead to a
CAL FAULT.
Display
shows CAL
Sensor cell replacement was
detected or display was
factory-set.
Perform Initial Calibration if unit is new
or cell was replaced.
Perform regular calibration if same cell
was re-installed.
Display
flashes Err 1*
Sensor cell detected as
missing.
Inspect cell for proper placement.
After recovery, see above SYMPTOM:
"Display shows CAL".
Damaged sensor body
Replace sensor body and perform Initial
Calibration.
*Hydrogen Cyanide, Hydrogen Chloride, and Sulphur Dioxide Sensors
NOTE: This NOTE and the following CAUTION apply to the Ultima Series sensors for
Hydrogen Cyanide (HCN), Hydrogen Chloride (HCL), and Sulphur Dioxide (SO
2
) only. The
Ultima Series product line contains a sensor detection function to alert the user of a sensor
disconnection problem by displaying "ERR 1" on the LCD display.
"
CAUTION
The sensor detection function is NOT present in the HCN, HCL, NH
3
, 100 ppm H
2
S, or
SO
2
version of the Ultima series. Therefore, an HCN, HCL, NH
3,
100 ppm H
2
S
,
or SO
2
sensor disconnection will NOT be indicated by an "Err 1" display. A periodic check
with a known concentration of calibration gas must be performed regularly to ensure
proper sensor function. See "Calibration" portion of Chapter 2 in this manual for
calibration instructions.
Chapter 4, Maintenance
4-6

MSA Ultima Specifications

General

Brand	MSA
Model	Ultima
Category	Monitor
Language	English