Vaisala DMT242 - Manual (Page 2)

Vaisala DRYCAP ® Dewpoint Transmitter DMT242
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June 2008 | M010036EN-D
5. Insert the wired screw terminal back into the connector excatly in the position indicated in Figure 3.
Push the fixing screw through the connector. Fasten the cable clamp. Insert the wired connector into
the counter connector.
NOTE The connection is incompatible if the positioning of the screw terminal is NOT as
indicated in Figure 3. Fasten the fixing screw.
6. Install the back cover allowing the cable to run through the hole in the cover. The transmitter is ready
for use.
NOTE When the power is switched on, wait about 7 minutes before taking measurements.
Start-up self-diagnostics freeze the output during the first operation minutes.
Figure 3 Wiring and Installation of Connector
CALIBRATION AND MAINTENANCE
Replacing the sintered filter
If the sintered filter is dirty it can prolong the response time of the measurement. If the filter needs to be
changed unscrew the filter and replace the old filter with a new one.
Calibration
It is recommended to perform a calibration check every other year. A field check can be carried out by
using a calibrated reference probe and comparing the readings measured with the transmitter and the
reference probe. The Vaisala DRYCAP
®
Hand-Held Dewpoint Meter DM70 is ideal for confirming the
performance of the transmitter in the field. By using a connection cable the readings of DMT242 and
DM70 can be viewed simultaneously on the display of DM70. If there is need for adjustement contact
Vaisala Instruments Service Centers or local Vaisala representative.
SCREW TERMINAL MUST BE INSTALLED TO THE
CONNECTOR IN THE POSITION OF THE FIGURE
( TERMINALS 2 AND 3 AS UPPER EDGE )
1 = Connector
2 = Screw terminal of the connector
3 = Connector
4 = Cable clamp
5 = RS-232 serial port
6 = Terminals 2 and 3
7 = Three-wire cable
8 = Pressure setting switches
9 = Fixing screw