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Signet 8550-3 Flow Transmitter Signet 8550-3 Flow Transmitter
Current output:

4 to 20 mA, isolated, fully adjustable and reversible

Max loop impedance: 50
max. @ 12 V



325
max. @ 18 V



600
max. @ 24 V

Update rate:
100 ms

Accuracy:

±0.03 mA
Open-collector outputs, optically isolated:

50 mA max. sink, 30 VDC maximum pull-up voltage.
Programmable
for:

High or Low setpoint with adjustable hysteresis

Pulse proportional to rate or volume (max 300 pulses/min).
Environmental

Operating temperature: -10 to 70°C (14 to 158°F)

Storage temperature:
-15 to 80°C (5 to 176°F)
Relative
humidity:
0
to
95%,
non-condensing
Maximum
altitude:
2000
m
(6562
ft)
Insulation
category:
II
Pollution
degree:
2
Standards and Approvals:
CE,
UL
listed
Immunity
&
Emissions: EN61326

Manufactured under ISO 9001 and ISO 14001
General
Compatibility: Signet Flow Sensors (w/freq out)
Accuracy: ±0.5 Hz
Enclosure:

Rating:
NEMA 4X/IP65 front
Case:


PBT
Panel
case
gasket:
Neoprene

Window:
Polyurethane coated polycarbonate

Keypad:
Sealed 4-key silicone rubber

Weight:
Approx. 325g (12 oz.)
Display:

Alphanumeric 2 x 16 LCD

Update rate: 1 second

Contrast: User selected, 5 levels

Accuracy:

±0.5% of reading @25ºC

Thermal sensitivity shift: ±0.005% of reading per ºC
Electrical

Power: 12 to 24 VDC ±10%, regulated, 122 mA max.
Sensor Inputs:

Range: 0.5 to 1500 Hz

Sensor power: 2-wire: 1.5 mA @ 5 VDC ± 1%


3 or 4 wire: 20 mA @ 5 VDC ± 1%

Optically isolated from current loop

Short circuit protected
Flow1: 6.25 GPM
Flow2: 9.75 GPM
ENTER
Signet Flow
Transmitter
WARNING!
Remove power to unit before wiring input and out-
put connections.
Follow instructions carefully to avoid personal injury.
Contents
1. Speci
cations
2. Installation
3. Electrical Connections
4. Menu Functions
2. Installation
ProcessPro transmitters are available in two styles: panel mount and eld mount. The panel mount is supplied with the necessary
hardware to install the transmitter. This manual includes complete panel mounting instructions.
Field mounting requires one of two separate mounting kits. The 3-8051 integral kit joins the sensor and instrument together into a
single package. The 3-8050 Universal kit enables the transmitter to be installed virtually anywhere.
Detailed instructions for integral mounting or other eld installation options are included with the 3-8051 Integral kit or the 3-8050
Universal kit.
SIDE VIEW
Field Mount w/
8051 Integral kit
102 mm
(4.0 in.)
SIDE VIEW
Field Mount w/
8050 Universal base
106 mm
(4.18 in.)
82 mm
(3.23 in.)
92 mm
(3.6 in.)
97 mm
(3.8 in.)
56 mm
(2.2 in.)
41 mm
(1.6 in.
)
Optional
Rear
Cover
Panel Mount
SIDE VIEW
FRONT VIEW
96 mm
(3.8 in.)
96 mm
(3.8 in.)
Field Mount &
Panel Mount
1. Speci cations
Dimensions
3-8550.090-3 Rev. K 3/06 English
*3-8550.090-3*
English 2
Signet 8550-3 Flow Transmitter
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 S
D
2
_
+
Terminals 3-6: Loop Power
12-24 VDC ±10% system power and current loop outputs.
Max. loop impedance:
50 max. @ 12 V
325 max. @ 18 V
600 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 ow rate

May be disabled (Off) if not used.
Terminals 1 and 2: AUXILIARY power
Used only if the ow sensor requires more
than 1.5 mA current. For Signet sensors this
is limited to the following products:
2000
2507
2551
Open-collector Input signals
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
Output -
Output +
System Pwr
Loop -
System Pwr
Loop +
2
1
4
3
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Sensr V+
(BLACK)
7
6
5
Panel Mount
Installation Detail 3
Signet 8550-3 Flow Transmitter Instructions
3.1 System Power/Loop Connections
Terminals
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
No Aux Power
515/3-8510-XX
525
2100
2517
2536/3-8512-XX
2540/2541
7000 Vortex
Aux Power Required
2000
2507
Open-collector input signals
Maximum cable length is 200 ft. for 515/8510-XX,
525, 2517 and any sinusoidal ow signal.
Maximum cable length is 1000 ft. for
2536/8512-XX, 2540/2541, vortex, and any
open-collector ow signal.
A 200 ft. (61 m)
B 200 ft. (61 m)
A
B
8550-3
Flow
Flow1: 6.25 GPM
Flow2: 9.75 GPM
ENTER
3.2 Sensor
Input
Connections

Wiring Tips:
Do not route sensor cable in conduit containing AC power wiring.
Electrical noise may interfere with sensor signal.
Routing sensor cable in grounded metal conduit will help prevent
electrical noise and mechanical damage.
Seal cable entry points to prevent moisture damage.
Only one wire should be inserted into a terminal. Splice double
wires outside the terminal.
A
B
A 1000 ft. (305 m)
B 1000 ft. (305 m)
8550-3
Flow
Flow1: 6.25 GPM
Flow2: 9.75 GPM
ENTER

Stand-alone application, no current loop used
Trans mitter
Terminals
P ower
S upply
1224 V DC
Connection to a PLC with built-in power supply
Internal
PLC Connection
Connection to a PLC/Recorder, separate supply
Example: Two transmitters connected to PLC/Recorder with separate power supply +
P L C or R ecorder
Loop 2
Loop 2 +
System Power Loop 1
System Power Loop 1 +
AUX Power
AUX Power +
6
5
4
3
2
1
Trans mitter
Terminals
Loop 2
Loop 2 +
System Power Loop 1
System Power Loop 1 +
AUX Power
AUX Power +
6
5
4
3
2
1
6
5
4
3
2
1
Trans mitter
Terminals
Loop 2
Loop 2 +
System Power Loop 1
System Power Loop 1 +
AUX Power
AUX Power +
Loop 2
Loop 2 +
System Power Loop 1
System Power Loop 1 +
AUX Power
AUX Power +
6
5
4
3
2
1
6
5
4
3
2
1
Loop 2
Loop 2 +
System Power Loop 1
System Power Loop 1 +
AUX Power
AUX Power +
P ower
S upply
1224 V DC +
P L C or R ecorder
Channel 3
4-20 mA in
Channel 4
4-20 mA in

+ +
Trans mitter 1
Terminals
Trans mitter 2
Terminals
P L C Terminals
Channel 1
4-20 mA
+

Power
Supply
1224 VDC
Channel 2
4-20 mA
+


+
Channel 2
4-20 mA
+

Channel 1
4-20 mA

+
Channel 1
4-20 mA in
Channel 2
4-20 mA in
+

+ P ower
S upply
1224 V DC +
NC
NC
Auxiliary Power Note:
Auxiliary power is necessary for flow sensors that require more than 1.5 mA of current.
This includes the following Signet flow sensors: 2000, 2507, 2551 and all Open Collector signal inputs 4
Signet 8550-3 Flow Transmitter
Monitor the ow rate of Channel 1 and Channel 2 simultaneously.
This is the permanent view display.
Monitor the delta ow rate (Channel 1 rate - channel 2 rate = Delta Flow)
This is a permanent display.
Tot1: 1234567.8
Tot2: 123456.78
>
Perm1: 1234567.8
Gallons
Perm2: 123456.78