Function channels
12.10 Function channels
At the end of the table of measuring ranges and units (see above) under the
sub-heading
function channels
there is a group of ranges that can be used to
represent function parameters for measured value processing or for calculated
results obtained by linking certain measured values on measuring channels
(see Manual 6.3.4). Reference to the actual measuring channels is provided by
one or two reference channels. For all function channels there are preferred
channels on the appropriate connector; reference channel programming is not
required because these values are referred to by standard reference channels
Mb1 and Mb2.
Function
Function channel
Reference chan-
nel 1
Reference
channel 2
* Humidity variables, capacitive
on channel 3 or 4
Mb1 = temperature
Mb2 = humidity
* Humidity variables, psychrometric on channel 3 or 4
Mb1 = TT
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=M05
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 Sec-
tion 12.12.6.
A new feature is the presence of 4 device-internal channels
. The first
(M2/M3/M4) is programmed by default as differential channel
M1 – M0
(see
10.3), if two sensors with the same units and same decimal point position are
connected at measuring points
M0
and
M1
; the fourth is used for average val-
ues (see 11.2). However, all four channels can be used in conjunction 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 de-
vice-internal basis, the sensor must be connected to M1.
ALMEMO
®
2590
53
M0 M1 M2 M3 M4
00
10
20
30
03
13
23
33
01
11
21
31
02
12
22
32
1. chan.
2. chan.
3. chan.
4. chan.
04
14
24
34
Device
internal
channels
Difference
M01-M00
sensor channels
2590-2
00
10
20
30
01
11
21
31
02
12
22
32
03
13
23
33
00
10
20
30
01
11
21
31
02
12
22
32
sensor channels
M0 M1 M2 M3
M0 M1 M2
2590-3
2590-4
sensor channels
Device
internal
channels
Device
internal
channels
Average
Summary of Contents for ALMEMO 2590-2
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Page 75: ...Your contact ALMEMO 2590 75...
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