2 connection diagram – Thermo Fisher Scientific Alpha COND 2000 (In the process of updating the brand guideline & product image) User Manual
Page 17
Instruction Manual
αlpha CON 2000
11
3.2
Connection Diagram
Caution: Ensure electrical mains are disconnected before proceeding.
Connections for wall mounting version
L
N
PT100/ PT1000
Current
HOLD
OP2
Current
OP1
1
2
3
13
14
4
5
6
7
8
9
10
11
12
15
16
17
18
19
20
21
22
23
24
25
30
29
28
27
26
31
32
33
Anti-surge
PT1000
PT100/
1
L
2
N
Current
15
Current
13
OP2
14
16
OP1
17
3
4
5
6
22
HOLD
GND
18
19
21
20
23
24
25
7
8
9
10
11
29
26
28
27
30
31
32
33
12
250V, 315 mA,
Anti-surge
1.
AC mains live wire
18.
12V Power supply
2.
AC mains neutral wire
19.
Hold function
3.
AC mains protective earth wire
20.
Hold function
4.
Relay A (SP 1)
21.
Earth ground
5.
Relay A (SP 1)
22.
no connection
6.
Relay B (SP 2)
23.
no connection
7.
Relay B (SP 2)
24.
no connection
8.
Wash relay
25.
no connection
9. Wash
relay
26. Temperature
ground
10.
Alarm relay (NC)
27. Temperature
Sense
11.
Alarm relay common
28.
Temperature Input (short to terminal
12.
Alarm relay (NO)
27 if using 2- wire RTD)
13.
4-20 mA temperature output, +ve terminal 29.
no connection
14.
4-20 mA temperature output, -ve terminal
30. 4 Cell type Conductivity Input
15.
4-20 mA Conductivity output, +ve terminal **31. 4 Cell / 2 Cell type Conductivity Input
16.
4-20 mA Conductivity output, -ve terminal
**32. 4 Cell / 2 Cell type Conductivity Input
17. 12V
ground
33. 4 Cell type Conductivity Input
IMPORTANT: The Alarm relay functions as an “Active Low” device i.e. it switches
OFF under Alarm condition. Therefore the Alarm display device should be connected
to the ‘NC’ contacts of the relay (10 & 11).