SAMPLE GAS DEHUMIDIFIER DH6 Manual, Rev. 10/2020
5
M
D
H
6E
N
-1
0-
20
20
any condensate to drop back into the reaction vessel.
If the dryer is located only just in front of the photometer, condensation of the water vapor takes
place in the sample gas tubing.
See our TechNotes TN-3 and TN-10
(www.bmt-berlin.de/technotes) for a detailed discussion.
Take care of the orientation of the dryer in order to let any condensate easily drop back into the
vessel or tube!
After power-up the LEDs "warm" and "max. power" are activated, until the desired internal
cooling temperature has been reached, see chapter 5 (Display) for details.
4
Electrical connection
The pinout of the 4-pole electric connector is as follows:
black
1
GND (24VDC & cable shield)
white
2
+24 VDC
(screw terminal
brown
3
contact DRYER ERROR
side)
green
4
contact DRYER ERROR
The electronics are protected by a fuse rated 2A slow blow, type TR-5 (Wickmann). It also has a
reverse polarity protection, which will not burn the fuse in case of the wrong polarity. If connect-
ed to a BMT 964 OG off-gas analyser, no external power supply is needed.
5
Display
The digital display shows the actual temperature of the inner wall of the cooler. After the user has
opened the lid of the display module using a screw driver (Pozidriv), a pushbutton switch and a
potentiometer are accessible.
Caution
: Before opening the lid of the electronics box, the user should ground himself by touch-
ing grounded points in order to prevent damage by electrostatic discharge.
2
1
3
4