Sensor programming
Function
Function channel
Reference chan-
nel 1
Reference
channel 2
* Humidity variables, capacitive on channel 3 or 4
Mb1 = temperature
Mb2 = humidity
* Humidity variables, psychr.
on channel 3 or 4
Mb1 = DT
Mb2 = HT
Function parameter (Mb1)
on channel 2, 3, or 4
Mb1 = channel 1
Difference (Mb1 - Mb2)
on channel 2, 3, 4 (Mb1)
Mb1 = channel 1
Mb2=M00
Average value over Mb2...Mb1
on channel 2, 3, 4 (Mb1)
Mb1 = channel 1
Mb2=M00
Total value of Mb2...Mb1
on channel 2, 3, 4 (Mb1)
Mb1 = channel 1
Mb2=M00
q
/
M01
−
M00
on channel 2, 3, 4 (q)
Mb1 = channel 1
Mb2=M09
WBGT
on channel 2 (GT)
Mb1 = channel 1
Mb2=M00
Arrangement of channels on the connectors :
Once the range has been programmed the standard reference channels can be
used (see above). Settings for the reference channels are described in Section
12.4.6. The best approach is to use the
Function channels
wizard.
A new feature is the presence of 4 device-internal channels
. M9 is pro-
grammed by default as differential channel
M1 – M0
; this applies if there are two
sensors with the same units and same decimal point position connected at
measuring points
M0
and
M1
. However, all four channels can be used in con-
junction with any function channels with standard reference channels
Mb1
=
M1
and
Mb2
=
M0
; i.e. if you want to program a function parameter without reference
channel on a device-internal basis, the sensor must be connected to M1.
Advantage
of device-internal channels :
If several sensors are being used for the same application, they do not have to
be reprogrammed and can be freely exchanged without losing their function
channel assignment. However, if the whole application operates with just one
sensor, then programming on the sensor itself makes more sense.
ALMEMO
®
5690-2M
69
M0 M1 M2 M3 M4
00
10
20
30
03
13
23
33
04
14
24
34
01
11
21
31
02
12
22
32
1. Chan.
2. Chan.
3. Chan.
4. Chan.
09
19
29
39
Device internal channels
Difference M01-M00
Sensor channels
05
15
25
35
06
16
26
36
07
17
27
37
08
18
28
38
M5 M6 M7 M8