Table 5-1. Troubleshooting Guidelines - MSA Toxgard II Instruction Manual

Chapter 5, Maintenance

Table 5-1. Troubleshooting Guidelines

SYMPTOM POSSIBLE CAUSE
Unit will Insufficient voltage or
not current from power supply.
power Incorrect wiring connections.
up Wire strands touching at
properly. input terminal block.
Cell signal too low or too
high during calibration.
Unstable calibration signal.
Display
Old or damaged cell.
shows
CAL
FAULT.
Failed autocal calibration
Display Sensor cell replacement
shows was detected or display
CAL. was factory-set.
Sensor cell detected as
Display
missing.
flashes
Err 1*.
Damaged sensor body.
Display
flashes Invalid cell type.
Err 2.
Display
Non-volatile memory not
flashes
detected.
Err 3.
Non-volatile memory reset
or not initialized.
Display
(Cell type changed.)
shows
Err 4.
Damaged sensor or
sensor body
*Hydrogen Cyanide, Hydrogen Chloride and Sulfur Dioxide Sensors
NOTE: This NOTE and the following CAUTION apply to the Toxgard II Series
sensors for Hydrogen Cyanide (HCN), Hydrogen Chloride (HCL) and Sulfur
Dioxide (SO ) only. The Toxgard II Series product line contains a sensor
2
detection function to alert the user of a sensor disconnection problem by
displaying "ERR 1" on the LCD display.
The sensor detection function is NOT present in the HCN, HCL, SO
100 ppm H S version of the Toxgard II series. Therefore, an HCN, HCL or
2
SO sensor disconnection will NOT be indicated by an "ERr 1" display. A
2
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.
5-6
CORRECTIVE ACTION
Check power supply and
interconnecting wires.
Check calibration gas and flow system;
then, recalibrate (valid calibration or
Initial Calibration will clear display).
Replace cell and perform Initial
Calibration.
(If original cell is new, an Initial
Calibration alone may solve the
problem.)
If the unit is incorrectly set up for
autocal, disable the autocal mode by
setting the future calibration date to
12-31-1993 or check the autocal flow
system.
Perform Initial Calibration if unit is
new or cell was replaced.
Perform regular calibration if same cell
was re-installed.
Inspect cell for proper placement.
After recovery, see above SYMPTOM:
"Display shows CAL".
Replace sensor body and perform
Initial Calibration.
Replace or repair main board.
Cycle power or repair main board.
Perform Initial Calibration.
Replace sensor or sensor body and
perform initial calibration.
"! CAUTION
or
2