Granville-Phillips Mini-Convectron 275 Series, Installation, Operation And Service Instructions, Page: 42 / 52

34 Mini-Convectron
®
Module with DeviceNet
®
Digital Interface
Chapter 5
5.3 Status Information For status information, see Table 5-2 through Table 5-5.
Table 5-1 DeviceNet Digital Interface Troubleshooting Procedures (Continued)
Problem Possible Cause Corrective Action
Readout cannot be calibrated to the
specified value using Zero_Adjust or
Gain_Adjust service. 1. Gauge incorrectly calibrated out of
operating range.
2. Gauge tube contaminated with
material from vacuum system.
3. The gold plating on sensor has
been attacked by a gas such as
flourine or mercury vapor.
1. Use restore factory calibration
command (Service 32
hex
, Class
31
hex
, Instance 01
hex
) to restore
factory calibration. User
calibration values can re-
calibrated if desired.
2. Refer to page 37 and clean gauge
tube. If not effective, replace
gauge tube.
3. Refer to page 40 and replace
gauge tube. Cleaning will not
solve this problem.
Readout indicating a pressure in the
system that is very different than being
observed by supporting gauges. 1. Gas composition on system is not
what the user believes it to be. This
can be caused by selective gas
pumping, process in use,
outgassing of product, etc.
2. Gauge calibration incorrect.
1. Determine gas composition and
refer to page 23 to calibrate the
275 Mini-Convectron Vacuum
Gauge Module accordingly.
2. Use restore factory calibration
command (Service 32
hex
, Class
31
hex
, Instance 01
hex
) to restore
calibration. User calibration
values can be re-calibrated if
desired.
Table 5-2 Analog Sensor Status, Class 31
hex
Instance 1, Attribute 7
BIT Definition
0 High Alarm – none
1 Low Alarm – bridge volts < 200 mV, sensor failure
2 High Warning – none
3 Low Warning bridge volts < 300 mV, calibration needed
Table 5-3 Analog Sensor Reading Valid, Class 31
hex
Attribute 5
BIT Definition
0 Reading Valid – indicate valid reading