Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 21
Relay Configuration in DIP Mode
NOTE
Relay is included on HMW93 and TMW93 transmitters only.
When the transmitter is configured using DIP switches, the functioning
of the relay is configured by DIP switch 5 and the rotary switch on the
component board:
- DIP switch 5 determines if the relay is closed above or below the
setpoint.
- The position of the rotary switch determines the setpoint according to
the table below.
Table 5
Rotary Switch and Relay Setpoint
Rotary Switch Position Setpoint on HMW93
Setpoint on TMW93
0
5 %RH
0 °C (32 °F)
1
10 %RH
5 °C (41 °F)
2
20 %RH
10 °C (50 °F)
3
30 %RH
15 °C (59 °F)
4
40 %RH
20 °C (68 °F)
5
50 %RH
25 °C (77 °F)
6
60 %RH
30 °C (86 °F)
7
70 %RH
35 °C (95 °F)
8
80 %RH
40 °C (104 °F)
9
90 %RH
45 °C (113 °F)
NOTE
The rotary switch only has 10 positions. Do not turn the switch so that it
is between two positions.
For examples of relay behavior in DIP mode, see Figure 8 and Figure 9
on page 22. Note also the following:
- Relay operation in DIP mode is linked to RH measurement on
HMW93, and to T measurement on TMW93.
- Relay contacts are open if the transmitter is in error state (an active
error is present).
- Relay contacts are open when transmitter is powered off.
If you need to configure the relay for some other parameter or need
additional configuration options, see section Relay Configuration in
Custom Mode on page 54.
