Table of Contents
Advertisement
8.1
Overview
This section describes various possible problems and the means to correct them.
8.2
Troubleshooting
8.2.1 General
If trouble is encountered in the adjustment of zero, refer to Section 8.2.2 Recalibration for adjustment
procedures. If current flow in the sensing unit-7866 Digital Controller leads cannot be adjusted for 200
microamperes to 500 microamperes, refer to Step 2 in Table 8-4. Alarm circuit problems can usually be
solved by referring to Section 5.8 Setting the Alarm Limits.
Note that alarm circuits will not activate unless the controller/indicator is set to Range 3.
8.2.2 Recalibration
A routine procedure for checking calibration is presented in Table 8-1 Coarse Zero.
Do not open, even when isolated, when a flammable/dust atmosphere is present.
SENSING UNIT WITH EXPLOSION-PROOF DESIGN
• Never open the threaded cover until the power line is disconnected at the 7866 Digital Controller.
• Always loosen the set screw before turning the threaded cover.
• Never make any test with power applied to the sending unit until you either remove the sensing unit to a
nonhazardous area or verify that the atmosphere is free from combustible gases.
Failure to comply with these instructions could result in death or serious injury.
9/06
7866 Triple Range Digital H
8. Troubleshooting
and CO
Analyzer/Indicator - Operation and Maintenance
2
2
Troubleshooting
67
Advertisement
Table of Contents
Troubleshooting
