MGS-250 Manual
30
6490-9000 Revision 3
Section 4. Operation and Stabilization
4.1. Power Up and Warmup
On powering up, the MGS-250 will sense for the presence of gas after an
initial warm-up period of 2 to 5 minutes. The green LED will flash at a 1
second interval during the warm up.
4.2. Stabilization
IMPORTANT: It is vital when first installing the gas detector
that it warms up in an atmosphere that is known not to
contain any background concentrations of refrigerant.
Bacharach offers portable gas detectors for this purpose.
Contact the factory for more information.
4.3. Perform a Manual Zero
After the gas detector stabilizes, the power LED stops flashing and is lit
continuously. Bacharach recommends manually zeroing the MGS-250
after a 1-hour stabilization period. Increase this stabilization period to
3 hours for freezer applications.
To manually zero the gas detector, press and hold the UP and DOWN
buttons simultaneously for 5 seconds. The gas detector will beep and
the display will show “zEro” when zeroing is complete. The display will
show fAiL if the temperature is changing too quickly or there is an active
alarm condition. Additionally, certain system faults (F.-08, F.-10 through
14, and/or F.-16) will prevent a manual zero from being performed.
NOTE: Manual zero should be performed in the environment
of operation and at the typical operating temperature.
NOTE: Subsequent manual zeroes may be performed,
provided the atmosphere around the gas detector is free of
all background concentrations of refrigerant. Clean air or
nitrogen applied to the calibration port for five minutes may
be used to ensure the gas detector is clear of all background
gas. Re-zeroing with background refrigerant present will
cause the gas detector to report incorrect readings.
Summary of Contents for 6401-0500
Page 4: ...MGS 250 Manual 4 6490 9000 Revision 3 ...
Page 12: ...MGS 250 Manual 12 6490 9000 Revision 3 Figure 3 Gas Specific MGS 250 Gas Detectors ...
Page 21: ...MGS 250 Manual 6490 9000 Revision 3 21 Figure 6 Front and Back Views of MGS 250 Base ...
Page 39: ...MGS 250 Manual 6490 9000 Revision 3 39 Figure 15 Analog Output Scaling Options ...