Vaisala HMT310 - Manual (Page 60)

User's Guide _______________________________________________________________________
60 ___________________________________________________________________ M210619EN-E
NOTE To activate the new interval setting immediately, reset the transmitter.
Chemical Purge in Powerup
This command enables or disables the function which turns on chemical
purge within 10 seconds from the powerup of the device.
Syntax: PURR x
Where
x = ON/OFF (default = OFF)
NOTE When you enable this function, wait about 8 min after powerup before
taking measurements. The powerup chemical purge locks the output
values for the first operation minutes.
Chemical Purge Activated Manually
Chemical purge needs to be performed always before calibration (see
Chapter Calibration and Adjustment on page 69) or whenever there is
reason to believe that the sensor has been exposed to an interfering
chemical. Make sure that the temperature of the sensor has come down to
normal before starting calibration.
Before starting chemical purge note the following:
- The sensor must be protected with a PPS grid with stainless steel
netting, a stainless steel sintered filter or with a membrane SST filter.
- The sensor temperature needs to be below 100 °C. At higher
temperatures the chemicals evaporate spontaneously from the sensor
and the chemical purge is not necessary.
Starting Manual Chemical Purge
Activate chemical purge with the PURGE command.
Syntax: PURGE
Example:
>purge
Purge started, press any key to abort.
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