Vaisala MMT162 - Manual (Page 37)

Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 35
Set Malfunction Alarm Output for Analog
Channels
Use the AERR command to set the analog output levels that are output in
case of a device malfunction. The default output level is 0.
AERR
Example:
aerr
Ch1 error out : 10.000V ? 0
Ch2 error out : 1.000V ? 0
NOTE The error output value must be within a valid range of the output mode.
NOTE The error output value is displayed only when there are minor electrical
faults such as a humidity sensor damage. When there is a severe device
malfunction, the error output value is not necessarily shown.
Set Alarm Limits and LED Indication for
Analog Outputs
Use the ALARM command to set the analog output alarm limits and
parameters. For an explanation of the alarm limits, see section Limit
Alarm on page 22.
ALARM
Before setting the alarm limits, verify the currently set analog output
modes using the AMODE command.
The following example shows that a high limit alarm has been enabled
for channel 2. If the measured value rises above the limit ( 0.90 a
w
), an
error is reported. If you are using a LED cable, the LED lights up to
indicate an error state.
Example:
alarm ?
Channel 1:
Low Limit : OFF
High Limit : OFF
Aerr : ON
Quantity : T
Limit Lo : 15.00
Limit Hi : 30.00