6
Signet 2551 Display Magmeter
The 3-2551-21 and 3-2551-41 Magmeter can be con
fi
gured in the
OPTIONS menu to provide a Frequency or Digital (S
3
L) output.
Frequency and Digital (S
3
L) output can be used by Signet 8900
Multi-Parameter Controller and 9900 Transmitter.
2551 Frequency Out to 8900 Controller
3-8900.621C
I/O Module 3-8900.401-X
1
2
3
4
5
6
7
8
9
10
11
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S L (Red)
GND (White/Shield)
+5VDC (Black)
S L (Red)
GND (White/Shield)
3
3
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
1
2
3
4
Ground
+5 VDC
Not used
Data
2551 Magmeter
2551 Digital (S
3
L) Out to 8900 Controller
3-8900.621C
I/O Module 3-8900.401-X
1
2
3
4
5
6
7
8
9
10
11
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S L (Red)
GND (White/Shield)
+5VDC (Black)
S L (Red)
GND (White/Shield)
3
3
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
1
2
3
4
Ground
+5 VDC
Not used
Data
2551 Magmeter
Wiring to Signet Flow Instruments
The 3-2551-22 and 3-2551-42 Magmeters provide a passive
4 to 20 mA loop output.
• External loop power (24 VDC) is required.
• Factory standard calibration is 4 to 20 mA = 0 to 5 m/s.
• The 4 to 20 mA output can be spanned to any range,
from -10 m/s to +10 m/s.
• AUX PWR must be connected to power the display
backlighting and to power to the relay coils if included.
2551 Magmeter
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
21.6 to
26.4 VDC
V-
+ VDC
- VDC
Aux Pwr
4-20 mA Loop Output
1
2
3
4
Auxiliary Power for:
Display backlighting
Relay Coils
4
20
Wiring to 4 to 20 mA Output
When using the 2551 in a system with other manufacturer's
equipment, a 10 K
Ω
pull-up resistor (not supplied) may be
required to power the open collector output.
1
2
3
4
Frequency Out
2551 Magmeter
24 VDC
NO3
NC3
C3
Relay 3
V+
V-
5-24 VDC
Ground
Ground
Aux Pwr
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Non-Signet
Flow Instrument
Ground
Frequency Input
5-24 VDC Out
Auxiliary Power for:
Display backlighting
Relay Coils
10 KΩ
Pull-up Resistor
Wiring to other manufacturer's Instruments
2551 Frequency or Digital (S
3
L) Out to 9900 Transmitter
1
2
3
4
DA
T
A
GND
V+
SHLD
2551 Magmeter
9900 Transmitter
+5 VDC
Ground
Not used
Frequency or (S
3
L)
