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BENDER  CME420-D-1; B73060001

 
regularly may indicate problems and prevent any sudden breakdown. 
Use the MON2000 software in the offline mode and select Logs > 
Parameter List from the drop-down menu and open a saved *.par file. 
Do not adjust any values if they are within the nominal tolerance values 
on the Checklist. Compare the values with those obtained in preceding 
weeks. This may pinpoint your problem immediately. 
Preamp Input 4 Out of Range same as Preamp Input 1 Out of Range
Preamp Failure same as Preamp Input 1 Out of Range
Analyzer Failure Indicates either the Carrier Gas is low (below 90 
psig at Carrier Gas bottle) or gone; a bad 
solenoid; a Carrier Gas leak in system.
Power Failure GC Controller has experienced a re-start since 
alarms were last cleared, caused by power 
failure. Automatically starts in RUN mode and 
runs calibration gas until it identifies all retention 
times or for a maximum of two hours before 
switching to line gas.
TCD
Fused Peak Overflow - Noisy 
Baseline
Air not purged from carrier lines; bad 
thermistors; shields.
RF% Deviation Calibration gas low or out; valve timing error; 
faulty auto-calibration solenoid.
Warm Start Calibration Failure same as RF% deviation
Valve Timing Failure same as RF% deviation
Table 4-1. Basic Hardware Troubleshooting via Alarms (Continued)
Alarm Possible Cause
Model 700 Gas Chromatograph System Reference Manual
APRIL 2012 3-9000-521
4 - 13
The following is a guide for troubleshooting if a problem with sample 
analysis occurs. See Table 4-1 for diagnostic data. This data will be useful 
if it becomes necessary to call Measurement Services for assistance.
Table 4-2. Troubleshooting Checklist
Description As Found As Left Notes
Analyzer
Leak check with Snoop from 
Carrier Gas bottle to Analyzer 
regulator.
Leak check with Snoop from 
calibration standard to autocalibration solenoid.
Pre-amp balance voltage
___________mV _________mV 0 (±0.5 mV)
Sample System
Leak check with Snoop from 
sample probe to sample solenoid
System Reference Manual Model 700 Gas Chromatograph
3-9000-521 APRIL 2012
4 - 14
Controller Inputs
GRI (CH.1) 0.0 - 0.0
GRI (CH.2) 0.8 - 1.2
GRI (CH.3) 0.8 - 1.2
GRI (CH.4) 0.8 - 1.2
Value (12-bit AD)
PAZ1
PAZ2
PAZ3
PAZ4
Value (16-bit AD)
GC 1
GC2
GC3
GC4
____________
____________