Electrical Connections - Signet 8550-3 User Manual

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.

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.
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 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
page 2 of 8
Loop 2-
6
Loop 2+
5
System Pwr
4
Loop -
System Pwr
3
Loop +
AUX
2
Power -
AUX
1
Power +
Terminals 7-10: Open-collector Outputs
Two transistor outputs, programmable (see CALIBRATE menu) as:
‡ SIGNET
Terminals 11-16: Flow sensor inputs
10
Output 2-
9
Output 2+
8
Output 1-
7
Output 1+
Internal open-collector
output circuit
15Ω
S
D
Isolation
• High or Low setpoint with adjustable hysteresis
• Pulse based on Volume.
• Frequency based on flow rate
• May be disabled (Off) if not used.
panel
gasket
terminals
latch
Panel Mount
Installation Detail
quick-clips
Snsr 2 Gnd
16
(SHIELD)
Snsr 2 IN
15
(RED)
Snsr 2 V+
14
(BLACK)
Snsr 1 Gnd
13
(SHIELD)
Snsr 1 IN
12
(RED)
Snsr 1 V+
11
(BLACK)
Outputs
1 2
_
+
8550-3 Flow Transmitter
mounting
bracket
2
1