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‡ SIGNET
8550-1 Flow Transmitter
Output -
System Pwr
Loop -
System Pwr
Loop +
AUX
Power -
AUX
Power +
4
3
2
1
6
5
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Sensr V+
(BLACK)
9
8
7
3.
Electrical Connections
Caution:
Failure to fully open terminal jaws before removing wire may permanently damage instrument.
Wiring Procedure
1.
Remove 0.5 - 0.625 in. (13-16 mm) of insulation from wire end.
2.
Press the orange terminal lever downward with a small screwdriver to open terminal jaws.
3.
Insert exposed (non-insulated) wire end in terminal hole until it bottoms out.
4.
Release orange terminal lever to secure wire in place. Gently pull on each wire to ensure a good connection.
Wiring Removal Procedure
1.
Press the orange terminal lever downward with a small screwdriver to open terminal jaws.
2.
When fully open, remove wire from terminal.
2
1
Terminals 5 and 6: Open-collector Output
A transistor output, programmable (see CALIBRATE menu) as:
• High or Low setpoint with adjustable hysteresis
• Volumetric pulse
• Frequency based on flow rate
• May be disabled (Off) if not used.
Terminals 3 and 4: Loop Power
12-24 VDC
±
10% system power
and current loop output.
Max. loop impedance:
50
Ω
max. @ 12 V
325
Ω
max. @ 18 V
600
Ω
max. @ 24 V
Terminals 7-9: Flow sensor input
Internal open-collector
output circuit
Output --
Output +
Isolation
15
Ω
S
D
Terminals 1 and 2: AUXILIARY power
Used only if the flow sensor requires
more than 1.5 mA current. For Signet
sensors this is limited to the following
products:
• 2000
• 2507
• 2530
• 2535
• 2540 if mfg. prior to Jan 1999
