MKS Granville-Phillips Mini-Convectron 275 series - DeviceNet Troubleshooting Procedures

5 DeviceNet Operation
54
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
5.4 DeviceNet Troubleshooting Procedures
Table 5-22 DeviceNet Interface Troubleshooting
Symptom Possible Causes Solutions
The readout cannot be calibrated to
the specified value using
Zero_Adjust or Gain_Adjust
service.
1. The gauge is incorrectly
calibrated out of operating
range.
2. The 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 Section 6.4.5 and clean
gauge tube. If not effective,
replace gauge tube.
3. Refer to Section 6.4.6 and
replace gauge tube. Cleaning
will not solve this problem.
The readout indicating a pressure
in the system that is very different
than being observed by supporting
gauges.
1. The gas composition in the
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 Section 4.8 to calibrate
the Mini-Convectron 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 5-23
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 required
Table 5-24
Analog Sensor Reading Valid, Class 31
hex
Attribute 5
Bit Definition
0 Reading valid - indicate valid reading