page 2 of 8
8550-3 Flow Transmitter
‡ SIGNET
Output 2-
Output 2+
Output 1-
Output 1+
10
9
8
7
Loop 2-
Loop 2+
System Pwr
Loop -
System Pwr
Loop +
AUX
Power -
AUX
Power +
6
5
4
3
2
1
Snsr 2 Gnd
(SHIELD)
Snsr 2 IN
(RED)
Snsr 2 V+
(BLACK)
Snsr 1 Gnd
(SHIELD)
Snsr 1 IN
(RED)
Snsr 1 V+
(BLACK)
16
15
14
13
12
11
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
1
Internal open-collector
output circuit
Outputs
Isolation
15
Ω
S
D
2
_
+
Terminals 3-6: Loop Power
12-24 VDC
±
10% system power and current loop outputs.
Max. loop impedance:
50
Ω
max. @ 12 V
325
Ω
max. @ 18 V
600
Ω
max. @ 24 V
Terminals 11-16: Flow sensor inputs
Terminals 7-10: Open-collector Outputs
Two transistor outputs, programmable (see CALIBRATE menu) as:
• High or Low setpoint with adjustable hysteresis
• Pulse based on Volume.
• Frequency based on flow rate
• May be disabled (Off) if not used.
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
• 7002 Vortex sensor
• Dual open-collector sensors
2.1 Panel Installation
1. The panel mount transmitter is designed for installation using a 1/4 DIN Punch. For
manual panel cutout, an adhesive template is provided as an installation guide.
Recommended clearance on all sides between instruments is 1 inch.
2. Place gasket on instrument, and install in panel.
3. Slide mounting bracket over back of instrument until quick-clips snap into latches on
side of instrument.
4. To remove, secure instrument temporarily with tape from front or grip from rear of
instrument. DO NOT RELEASE.
Press quick-clips outward and remove.
quick-clips
gasket
panel
terminals
mounting
bracket
latch
Outp
ut -
Out
put +
Sys
tem
Pw
r
Loo
p -
Sys
tem
Pw
r
Loo
p +
2
1
4
3
Sen
sr G
nd
(SH
IELD
)
Sen
sr IN
(RE
D)
Sen
sr V
+
(BLA
CK)
7
6
5
Panel Mount
Installation Detail
