Georg Fischer 8850-3 Specifications

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Signet 8850 Conductivity/Resistivity Transmitters

Check out the 9900 Transmitter
for your single channel needs

Features

Member of the ProcessPro® Family of Instruments

Panel Mount

Pipe, Tank, Wall and

Integral Mount

The Signet 8850 Conductivity/Resistivity Transmitter is
designed for multiple installation capabilities, simple
set-up and easy operation, thus satisfying a broad
range of application requirements.

A single sensor input into the 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 and one open collector output, the 8850-2 features
current loop plus two dry contact relays, or the 8850-3
with two 4 to 20 mA loop output and two open collector
relays.

• Display choices of μS, mS, KΩ, MΩ, PPM (TDS)

• Simulate function

• Programmable temperature compensation

• Mechanical 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

LEAD FREE

Pb

RoHS

MEASURING EQUIPMEN

77CJ

COMPLIANT

Applications

• 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

The 8850 is offered with a NEMA 4X/IP65 front panel
with a self-healing window in a convenient ¼ 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.

Specifications

General

Compatible Electrodes All Signet conductivity/resistivity electrodes
Sensor Input Range

Conductivity 0.055 to 400,000 μS/cm
Resistivity
TDS 0.023 to 200,000 ppm
Temperature PT1000 -25 °C to 120 °C -13 °F to 248 °F

Accuracy

Conductivity/Resistivity ±2% of reading
Temperature ±0.75 °C

Display Alphanumeric 2 x 16 LCD

Contrast User selected, 5 levels
Update Rate 1.8 seconds

Materials

Case PBT
Keypad Sealed 4-key silicone rubber
Panel and Case Gasket Neoprene
Window Polyurethane coated polycarbonate

Electrical

Power 12 to 24 VDC ±10% regulated

-1 90 mA max.

-2 290 mA max.

-3 100 mA max.
Current Output 4 to 20 mA, isolated, passive, fully adjustable and reversible
Max Loop Impedance

Update Rate 200 ms
Accuracy
Open Collector Output High, Low, Pulse, Off

Max Voltage Rating 50 mA max sink, 30 VDC max
Hysteresis User adjustable

Relay Output Mechanical SPDT contacts: High, Low, Pulse, Off

Max Voltage Rating
Hysteresis User adjustable

Environmental

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
Enclosure NEMA 4X/IP65 (front face only on panel mount); field mount is 100% NEMA 4X/IP65

Shipping Weight

Standards and Approvals

10 KΩ•cm to 18.2 MΩ•cm

50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V

±0.03 mA @ 25°C, 24 V

Max 400 pulses/min.

5A @ 30 VDC, or 5 A @ 250 VAC resistive load

Max 400 pulses/min.

0.6 kg 1.32 lb

CE, UL, CUL
RoHS compliant
China RoHS
Manufactured under ISO 9001 for Quality and ISO 14001 for Environmental Management

www.gfsignet.com