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Signet 8850 Conductivity Transmitters
Member of the ProcessPro® Family of Transmitters
Panel Mount
Description
The Signet 8850 Conductivity
Transmitter is designed for multiple
installation options, simple set-up
and easy operation, thus satisfying
a broad range of application
requirements.
Full microprocessor based
electronics allow for a wide operating
range and long term signal stability in
three different instrument versions:
the 8850-1 for a traditional two-wire
current loop, the 8850-2 features
current loop plus two dry contact
System Overview
In-line Sensor Installation
Signet 8850
Conductivity
Instrument
Signet Conductivity Electrode
(sold separately)
Signet 8850
Conductivity
Instrument
Signet Universal
Adapter Kit (3-8050)
(sold separately)
Integral MountPipe, Tank, Wall MountPanel Mount
Signet 8850
Conductivity
Instrument
Signet Integral
Adapter Kit (3-8052)
(sold separately)
Pipe, Tank, Wall and Integral Mount
relays, or the 8850-3 with two-wire
current loop, one sensor input signal
and two current loop outputs.
The 8850 is offered with a NEMA 4X/
IP65 front panel with a self-healing
window in a convenient 1/4 DIN
package for easy mounting. The 8850
can be configured via a simple menu
system.
In addition to programmable outputs
and relays, the unit can also be set up
to measure raw conductivity values,
hence meeting USP requirements.
Submersible Sensor Installation
Panel, Pipe, Tank, Wall Mount
Signet 8850 Conductivity Instrument
Pipe extension
or conduit
with 3/4 in.
FNPT threads
(customer supplied)
Signet Conductivity
Electrode
(sold separately)
Features
• Meets USP requirements for raw
conductivity
measurements
• Display choices of μS,
mS, KΩ, MΩ, PPM
(TDS)
• Simulate function
• Programmable
temperature
compensation
• Relay and open
collector options
• Dual output option
allows temperature
and process signal
transmission
• NEMA 4X/IP65
enclosure with self-
healing window
• Compatible with ALL
Signet conductivity
electrodes
Application
• RO/DI System Control
• Rinse Tank Control
• Cooling Tower,
Scrubber or
Blowdown Control
• Environmental
Study (TDS)
• Desalination Monitor
• Water Quality
Monitoring
• Leak Detection
• Chemical
Concentration
C
US
E171559
126
3/4 in. NPT Fittings - Customer supplied
Note: Submersible installation not applicable
for Sanitary Conductivity Electrode.
www.gfsignet.com
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Dimensions
)
3-8850-XP Panel Mount
96 mm (3.8 in.)
96 mm
(3.8 in.)
Optional
Splashproof
Rear Cover
41 mm
(1.6 in.)
Field version with universal
mounting kit.
41 mm
(1.6 in.)
56 mm
(2.2 in.)
97 mm
(3.8 in.)
106 mm
(4.18 in.)
Model 8850
Ordering Notes:
1) Instruments can be mounted directly to a sensor by
choosing the following:
• Order integral adapter kit
3-8052 (sold separately) to
connect the sensor to an
instrument.
• The following sensor part
numbers can be used for
integral mounting:
3-2819-1, 3-2820-1,
3-2821-1, 3-2822-1 (with
3-2820.390), and 3-2823-1.
2) Use the universal mount
kit (3-8050) with the field
mount instrument to
mount to a pipe, tank or
wall.
3) To mount the panel version
to a wall, use the heavy
duty wall mount bracket
4) Order RC filter kits to
protect relays from voltage
spikes.
Please refer to Wiring,
Installation and
Accessories sections
for more information.
www.gfsignet.com
92 mm
(3.6 in.)
82 mm
(3.23 in.
Specifications
General
Compatible electrodes:
All Signet conductivity electrodes
Accuracy: ±2% of reading
Display:
• Alphanumeric 2 x 16 LCD
• Contrast: User selected, 5 levels
• Update rate: 1.8 seconds
Materials
• Case: PBT
• Panel case gasket: Neoprene
• Window:
Polyurethane coated polycarbonate
• Keypad: Sealed 4-key silicone rubber
Electrical
Power:
• 12 to 24 VDC ±10% regulated
(-1) 21 mA max., (-2) 220 mA max.,
(-3) 60mA max.
Sensor input range:
• Conductance: 0.055 to 400,000 μS/cm
• Resistivity: 10KΩ•cm to 18.2MΩ•cm
• TDS: 0.023 to 200,000 ppm
• Temperature:
PT 1000, -25°C to 120°C (-13°F to 248°F)
Open-collector output: Hi, Lo, Pulse, Off
• Open-collector, optically isolated, 50mA
max, sink, 30 VDC max. with pull-up
resistor.
• Hysteresis: User Adjustable
• Max 400 pulses/min.
Ordering Information
Instrument Part Number
3-8850 Conductivity Transmitter
Select the model suited to the application
-1 One input with 4 to 20 mA output and one open collector; uses 4-wire power
-2 One input with 4 to 20mA output and two relays; uses 4-wire power
-3 One input with two 4 to 20mA outputs and 2 open collectors; uses 4-wire power
Field or panel mount- choose one
- Integral mount package
P Panel mount package
3-8850 -2 P Example Part Number
Mfr. Part No. Code
3-8850-1 159 000 228
3-8850-1P 159 000 229
3-8850-2 159 000 230
Electrical (continued)
Current output:
• 4 to 20 mA, isolated, passive, fully
adjustable and reversible
• Max loop impedance:
50Ω max. @ 12 V,
325Ω max. @ 18 V,
600Ω max. @ 24 V
• Update rate: 200 ms
• Accuracy: ±0.03 mA @ 25°C, 24 V
Relay output:
• Mechanical SPDT contacts: Hi, Lo,
Pulse, Off
• Maximum voltage rating:
5A @ 30 VDC, or 5A @ 250 VAC
resistive load
• Hysteresis: User Adjustable
• Max 400 pulses/min.
Environmental
Enclosure Rating: NEMA 4X/IP65 front
Operating temperature:
-10°C to 70°C (14°F to 158°F)
Storage temperature:
-15°C to 80°C (5°F to 176°F)
Relative humidity:
0 to 95%, non-condensing
Shipping Weight: 0.6 kg (1.32 lb.)
Standards and Approvals
• CE, UL listed
• Manufactured under ISO 9001: 2000
for Quality and ISO 14001:2004 for
Environmental Management
Mfr. Part No. Code
3-8850-2P 159 000 231
3-8850-3 159 000 232
3-8850-3P 159 000 233
Accessories and Replacement Parts
Mfr. Part No. Code Description
Mounting
3-8050 159 000 184 Universal mounting kit
3-8050.395 159 000 186 Splashproof rear cover
3-8052 159 000 188 3/4 in. Integral mounting kit
3-8052-1 159 000 755 3/4 in. NPT mount junction box
3-0000.596 159 000 641 Heavy duty wall mount bracket (for panel mount only)
3-5000.598 198 840 225 Surface Mount Bracket
3-8050.392 159 000 640 Model 200 retrofit adapter
Liquid Tight Connectors
3-9000.392 159 000 368 Liquid-tight connector kit for rear cover (3 connectors)
3-9000.392-1 159 000 839 Liquid-tight connector (1 set), NPT
3-9000.392-2 159 000 841 Liquid-tight connector (1 set), PG 13.5
Other
3-8050.396 159 000 617 RC Filter kit (for relay use), 2 per kit
127
Choosing
Products
Instrument
Multi-Pa-
rameter
Flow
pH/ORP
Conductivity/
Resistivity
Pressure, Level
Temperature,
Products
Other
Installation
Wiring &
Reference
Technical
Temperature/
Pressure
Graphs
of Terms
Glossary
Reference
Part No.
Index
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