Resistivity, Conductivity Electronics – 2850

Resistivity, Conductivity Electronics – 2850

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Resistivity or Conductivity Electronics Overview

The GF Signet 2850 Conductivity/Resistivity Sensor Electronics are available in various configurations for maximum installation flexibility. The threaded j-box version can be used with these same GF Signet sensors for submersible sensor mounting.  Universal mount version used for pipe, wall, or tank mounting and enables single or dual (digital output only) inputs using any standard GF Signet conductivity / resistivity sensor. It is also available as a combined integral system configuration for in-line mounting and includes a conductivity electrode in a choice of 0.01, 0.1, 1.0, 10.0, or 20.0 cm-1 cell constants. The 2850 is ideal for applications with a conductivity range of 0.055 to 400,000 µS or a resistivity range of 100 MΩ to 10 kΩ. Each range can be inverted and are field selectable.

All 2850 units are available with a choice of a single or dual digital (S3L) outputs, or a single 4 to 20 mA. The single digital (S3L) output version can be paired with the 9900 Transmitter to extend the distance between the measuring points to 120 m (400 ft).

The 8900 Multi-Parameter Controller allows for up to six sensor inputs directly into the Georg Fischer  Signet  8900 Multi-Parameter Controller. All 2850 units are built with NEMA 4X/IP65 enclosures which allow output wiring connections with long cable runs of up to 305 m (1,000 ft).

Resistivity or Conductivity Electronics Features

  • Accepts any cell constant
  • Compatible with all GF Signet  Conductivity Sensors
  • Output choices include digital (S3L) for use with the 4 to 20mA of GF Signet 8900, 9900, 9950
  • Compatible with GF Signet  Instrument Type 8900 or instruments accepting a 4 to 20mA output
  • Single or dual input available for remote mount version (S3L) only

Description

Ordering Information – 2850 Sensor Electronics** with EasyCal

NPT mount junction box (¾ inch threaded) for standpipe or integral mounting, single input only

3-2850-51 159 001 398 One input/one digital (S3L) output
for use with 8900 or 9900 One input/one 4 to 20 mA output
3-2850-52 159 001 399 One input/one 4 to 20 mA output

Universal mount junction box for remote mount, single or dual input

3-2850-61 159 001 400 One input/one digital (S3L) output for use with 8900 or 9900
3-2850-62 159 001 401 One input/one 4 to 20 mA output
3-2850-63 159 001 402 Dual input, dual (S3L) output for use with 8900 only

**For use when remote sensor mounting is desired. Compatible with ALL Signet conductivity electrodes. See individual electrode product pages for more information.

Specifications

General
Compatible Electrodes All GF Signet Sensors
Materials
NPT Mount Junction  Box for Integral Mount PBT
Universal/Remote Mount PBT, CPVC

EasyCal – Automatic Recognition of the Following Conductivity Values

146.93 μS, 1408.8 μS, 12856 μS (@25 °C) (Test solutions Per ASTM D1125-95)
10 μS, 100 μS, 200 μS, 500 μS, 1000 μS, 5000 μS, 10,000 μS, 50,000 μS, 100,000 μS (@ 25 °C) (Standard test solutions)
Electrical
Power 12 to 24 VDC ±10%, regulated for 4 to 20 mA output (typically called “Loop Powered”)
5 to 6.5 VDC ±5% regulated recommended (provided by the GF Signet 8900, 9900, 0486),

3.0 mA max for Digital (S3L) output (Reverse polarity and short circuit protected)

Digital (S3L) Output: Serial ASCII, TTL level 9600 bps

Accuracy Conductivity ± 2% of reading
Temperature < 0.2 °C
Resolution Conductivity 0.1% of reading
Temperature < 0.2 °C
Update Rate Conductivity and

Temperature

< 600 ms

 

Available Data
via Digital (S3L) Output
Raw conductivity
Calibrated  conductivity
Calibrated  temperature-compensated conductivity
Temperature
Max. Temperature/Pressure Rating
Operating Temperature -10 °C to 85 ° C 14 °F to 185 °F
Storage Temperature -20 °C to 85 ° C -4 °F to 185 °F
Relative Humidity 0 to 95%, non-condensing
Enclosure NEMA 4X/IP65

Current Output – Field-selectable ranges

Factory Set Span(Integral mount only) 0.01 cell (2839**) 4 to 20 mA = 0 to 100 ?S
0.10 cell (2840**) 4 to 20 mA = 0 to 1000 ?S
1.0 cell (2841**) 4 to 20 mA = 0 to 10,000 ?S
10.0 cell (2842**) 4 to 20 mA = 0 to 200,000 ?S
20.0 cell (2823)* 4 to 20 mA = 0 to 400,000 ?S

*Special Order 

**Test certificate supplied  with all sensors. Custom cell constant programmed into the electronics.

Max. Loop Resistance 50 Ω @ 12 VDC
325 Ω @ 18 VDC
600 Ω @ 24 VDC
Accuracy ± 2% of output span
Resolution 7 μA
Update Rate < 600 ms
Error Indication 22 mA
Pure Water Compensation When using 0.01-cm cell and raw conductivity value < 0.5 μS, the 2850 auto-switches to compensate for non-linear temperature effects  found in this low conductivity

(high resistivity) range.

Shipping Weight
NPT Mount

Junction  Box

0.75 kg 1.75 lb
Universal Mount 0.75 kg 1.75 lb
Standards and Approvals
CE, FCC
RoHS compliant, China RoHS
Manufactured under ISO 9001 for Quality and ISO 14001 for Environmental

Management and OHSAS 18001 for Occupational Health and Safety

Field Selectable Ranges for 4 to 20 mA Operation

The chart below indicates the field selectable ranges in which the 2850 sensor electronics can be set via internal switches. All ranges can be inverted if required. Signet Models listed below are compatible Conductivity/Resistivity electrodes.

0.01 Cell                     0.10 Cell                     1.0 cell                     10.0 Cell                     20.0 Cell
Signet Model 2839 Signet Model 2840 Signet Model 2841 Signet Model 2842 Signet Model 2823 (Special Order)
10 to 20 MΩ 0 to 2 μS 0 to 20 μS 0 to 200 μS 0 to 400 μS
2 to 10 MΩ 0 to 5 μS 0 to 50 μS 0 to 500 μS 0 to 1,000 μS
0 to 2 MΩ 0 to 10 μS 0 to 100 μS 0 to 1,000 μS 0 to 2,000 μS
0 to 1 MΩ 0 to 50 μS 0 to 500 μS 0 to 5,000 μS 0 to 10,000 μS
0 to 5 MΩ 0 to 100 μS 0 to 1000 μS 0 to 10,000 μS 0 to 20,000 μS
0 to 10 MΩ 0 to 200 μS 0 to 2000 μS 0 to 50,000 μS 0 to 100,000 μS
N/A 0 to 500 μS 0 to 5,000 μS 0 to 100,000 μS 0 to 200,000 μS
N/A 0 to 1,000 μS 0 to 10,000 μS 0 to 200,000 μS 0 to 400,000 μS

The 4 to 20 mA output ranges shown in this chart can be inverted using the internal switch Resistivity. Ranges are in BOLD Note: The 2819-2823 series Integral Systems must be ordered through special order products.

Brand

Georg Fischer

georg Fischer Signet logo

Additional information

Options

3-2850-51_Integral mount w/elect S3L, 3-2850-52_Integral mount w/elect 4-20, 3-2850-61_UNIV J BOX W/ELECT S3L, 3-2850-62_UNIV J BOX W/ELECT 4-20 mA, 3-2850-63_UNIV J BOX W/ELECT DUAL S3L

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