Heath Consultants Optical Methane Detector (OM) - Manual (Page 26)

26
O
PERATING
P
ROCEDURES
ERROR MESSAGES:
When a concentration of methane greater than the ALARM
SET POINT enters the light path, a high pitched alarm is
sounded. The higher the concentration of methane, the higher
this pitch becomes.
If any errors are present, they will be displayed instead of the
levels, and a low pitch alarm sound will be heard. The pos-
sible errors are WARM UP, LIGHT, FAILURE and BATT
LOW.
The WARMUP error will occur if the LIGHT SOURCE is
turned on before the system temperature has stabilized at its set
point, or if a malfunction in the system has occurred. If the
error remains for more than 15 minutes, turn off the system and
contact Heath.
The LIGHT error will occur when the light level is not suffi-
cient due to an obstruction of the light path (i.e. dirt or another
obstruction) or when the light bulb fails. If the LIGHT error
occurs, press the DISPLAY FUNCTION button to place the
instrument in the LIGHT mode and observe the numbers.
When this number drops below the alarm set point (typically –200),
the LIGHT alarm will occur. The optics may be cleaned, if neces-
sary, to improve the light intensity. If cleaning the lenses does not
correct the problem, a mechanical re-alignment may be necessary.
A FAILURE alarm will occur when the electronics has de-
tected an abnormal condition. This may occur when communi-
cating with a PC through the serial port. If you are not using
the serial port and the FAILURE error is displayed, turn off the
SYSTEM POWER and contact Heath.
The BATT LOW alarm occurs when the vehicle battery is
below approximately 12 volts. Check the battery and the battery
terminal condition if this error is displayed.