USER'S GUIDE____________________________________________________________________
158 _________________________________________________________________ M210704EN-F
For the adjustment of DMT340 equipped with DRYCAP
®
180M-sensor,
the reference low dewpoint temperature should be between -57 °C and -
67 °C (-70.6 °F ... -88.6 °F) in the gas temperature of approx. +20 °C.
To ensure the correctness of the adjustment, the reference dewpoint
meter must be calibrated at a recognized laboratory with a known
uncertainty and traceability to national or international standards.
To see when the adjustment was made last, select
Adjustment
information
(with keypad
INFO
button in the main view, or with serial
commands
?
and
CDATE
) or check the date from the
Device
information
. See section Device Information on page 110.
Opening and Closing the Adjustment
Mode
Open the transmitter cover. The buttons needed in the adjustment are on
the left-hand side of the motherboard, see Figure 2 on page 20.
Press the
ADJ
button to enable the adjustment mode. The indicator LED
indicates the adjustment availability.
Table 32
Indicator Led Functions
Indicator Led Function
Description
LED off
adjustment locked
LED on
adjustment available
LED blinking evenly
measurement not stabilized
LED blinking with short pulses
performing Purge/Autocal
Press the
ADJ
key again to disable the adjustment mode.
NOTE
Fixed pressure compensation of 1013.25 hPa is used when in adjustment
mode. Adjustments should be performed at ambient pressures.
