Conductivity Sensor System 2850

Conductivity Sensor System 2850

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Overview of Conductivity Sensor 2850

The Signet 2850 Conductivity/Resistivity Sensor Electronics are available in various configurations  for maximum installation flexibility. The universal mount version is for pipe, wall, or tank mounting and enables single or dual (digital versions only) inputs using any standard Signet conductivity/resistivity sensor. The threaded j-box version can be used with these same Signet sensors for submersible sensor mounting. 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 18.2 MΩ to 10 kΩ.

All 2850 units are available with a digital (S3L) output, or  a single 4 to 20 mA. The digital (S3L) output version can be paired with the 9900 or 9950 Transmitter to extend the distance between the measuring points to 120 m (400 ft).

The 8900 Multi-Parameter Controller allows for up to six 2850 (S3L) output conductivity sensors to be used with the 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).

The two-wire 4 to 20mA output version is available with eight 4 to 20 mA output ranges for each electrode cell constant. Each range can be inverted and is field selectable.

EasyCal is a standard feature that automatically recognizes conductivity test solution values for simple field calibration. A certification tool is available for validation of the sensor electronics according to USP requirements.

Conductivity Sensor system Features

  • Test certificate supplied with all sensors
  • Custom cell constant programmed into the electronics
  • Integral mount systems for quick and easy installation
  • Compact design for maximum installation flexibility
  • Extends the distance between the measuring point and the 9900 Transmitter to 120 m (400 ft)
  • Digital (S3L) interface or two-wire 4 to 20mA output
  • EasyCal with automatic test solution recognition
  • For use with ALL Signet conductivity electrodes

Description

Ordering Information – 2850 Integral Mount Systems, PVDF* (includes Sensor Electronics and PVDF Electrodes) with EasyCal

Digital (S3L) output

3-2850-51-39V 159 001 818 2839 Electrode, 0.01 cell NPT threads
3-2850-51-40V 159 001 819 2840 Electrode, 0.1 cell NPT threads
3-2850-51-41V 159 001 820 2841 Electrode, 1.0 cell NPT threads
3-2850-51-42V 159 001 821 2842 Electrode, 10.0 cell NPT threads
3-2850-51-39VD 159 001 822 2839 Electrode, 0.01 cell ISO threads
3-2850-51-40VD 159 001 823 2840 Electrode, 0.1 cell ISO threads
3-2850-51-41VD 159 001 824 2841 Electrode, 1.0 cell ISO threads
3-2850-51-42VD 159 001 825 2842 Electrode, 10.0 cell ISO threads

4 to 20 mA output

3-2850-52-39V 159 001 826 2839 Electrode, 0.01 cell NPT threads
3-2850-52-40V 159 001 827 2840 Electrode, 0.1 cell NPT threads
3-2850-52-41V 159 001 828 2841 Electrode, 1.0 cell NPT threads
3-2850-52-42V 159 001 829 2842 Electrode, 10.0 cell NPT threads
3-2850-52-39VD 159 001 830 2839 Electrode, 0.01 cell ISO threads
3-2850-52-40VD 159 001 831 2840 Electrode, 0.1 cell ISO threads
3-2850-52-41VD 159 001 832 2841 Electrode, 1.0 cell ISO threads
3-2850-52-42VD 159 001 833 2842 Electrode, 10.0 cell ISO threads

*For use when an integral 2850 system is desired (uses 2839-2842 series electrodes). Integral systems are shipped with a sensor and 2850 combined. Other 2850 systems are available with Signet 2818 to 2823 electrodes upon request. See individual electrode product pages for more information.

Accessories and Replacement Parts

Mfr. Part No. Code Description
3-2850.101-1 159 001 392 Plug-in NIST traceable recertification tool, 1.0 μS simulated
3-2850.101-2 159 001 393 Plug-in NIST traceable recertification tool, 2.5 μS simulated
3-2850.101-3 159 001 394 Plug-in NIST traceable recertification tool, 10.0 μS simulated
3-2850.101-4 159 001 395 Plug-in NIST traceable recertification tool, 18.2 MΩ simulated
3-2850.101-5 159 001 396 Plug-in NIST traceable recertification tool, 10.0 MΩ simulated
3-2839-1V 159 001 810 Electrode PVDF/SS- 0.01 μS/cm, ¾ inch NPT, 4.6 m (15 ft) cable
3-2839-1VD 159 001 811 Electrode PVDF/SS- 0.01 μS/cm, ISO 7/1-R 3/4, 4.6 m (15 ft) cable
3-2840-1V 159 001 812 Electrode PVDF/SS- 0.1 μS/cm, ¾ inch NPT, 4.6 m (15 ft) cable
3-2840-1VD 159 001 813 Electrode PVDF/SS- 0.1 μS/cm, ISO 7/1-R 3/4, 4.6 m (15 ft) cable
3-2841-1V 159 001 814 Electrode PVDF/SS- 1.0 μS/cm, ¾ inch NPT, 4.6 m (15 ft) cable
3-2841-1VD 159 001 815 Electrode PVDF/SS- 1.0 μS/cm, ISO 7/1-R 3/4, 4.6 m (15 ft) cable
3-2842-1V 159 001 816 Electrode PVDF/SS- 10.0 μS/cm, ¾ inch NPT, 4.6 m (15 ft) cable
3-2842-1VD 159 001 817 Electrode PVDF/SS- 10.0 μS/cm, ISO 7/1-R 3/4, 4.6 m (15 ft) cable
5523-0322 159 001 807 Sensor cable (per ft), 3 cond. plus shield, 22 AWG

Note: Although a customer can extend the cable of a conductivity sensor, GF Signet does not recommend this, and offers extended cable lengths from the factory.

General
Compatible Electrodes All 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 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 μS
0.10 cell (2840**) 4 to 20 mA = 0 to 1000 μS
1.0 cell (2841**) 4 to 20 mA = 0 to 10,000 μS
10.0 cell (2842**) 4 to 20 mA = 0 to 200,000 μS
20.0 cell (2823)* 4 to 20 mA = 0 to 400,000 μS

*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

3-2850-51-39V – S3L, NPT, 0.01cell, 3-2850-51-40V – S3L, NPT, 0.01cell, 3-2850-51-41V – S3L, NPT, 0.01cell, 3-2850-51-42V – S3L, NPT, 0.01cell, 3-2850-51-39VD – S3L, ISO, 0.01cell, 3-2850-51-40VD – S3L, ISO, 0.01cell, 3-2850-51-41VD – S3L, ISO, 0.01cell, 3-2850-51-42VD – S3L, ISO, 0.01cell, 3-2850-52-39V – 4-20mA, NPT, 0.01cell, 3-2850-52-40V – 4-20mA, NPT, 0.01cell, 3-2850-52-41V – 4-20mA, NPT, 0.01cell, 3-2850-52-42V – 4-20mA, NPT, 0.01cell, 3-2850-52-39VD – 4-20mA, ISO, 0.01cell, 3-2850-52-40VD – 4-20mA, ISO, 0.01cell, 3-2850-52-41VD – 4-20mA, ISO, 0.01cell, 3-2850-52-42VD – 4-20mA, ISO, 0.01cell

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