MSA Toxgard II User Manual

Table 5-1. 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 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.
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.
Display
flashes
Err 2.
Invalid cell type. Replace or repair main board.
Display
flashes
Err 3.
Non-volatile memory not
detected.
Cycle power or repair main board.
Display
shows
Err 4.
Non-volatile memory reset
or not initialized.
(Cell type changed.)
Perform Initial Calibration.
Damaged sensor or
sensor body
Replace sensor or sensor body and
perform initial calibration.
*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
2
) only. The Toxgard II 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, SO
2
or
100 ppm H
2
S version of the Toxgard II series. Therefore, an HCN, HCL 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 5, Maintenance
5-6

MSA Toxgard II Specifications

General

Brand	MSA
Model	Toxgard II
Category	Monitor
Language	English