pH/ORP Smart Sensor | 2751

pH/ORP Smart Sensor | 2751

pH/ORP Smart Sensor – Overview

This smart sensor is a solution for field-free calibration, out-of-range glass impedance, and broken glass detection, alerting the operator to probe failure or maintenance needs. It features two different outputs: a two-wire 4 to 20 mA loop output with optional EasyCal function or a digital (S3L) output that allows for longer cable lengths. The pH/ORP Electronics will allow for calibration of electrodes in a laboratory setting and installation of pre-calibrated probes in the field, reducing system downtime. Memory chip-enabled electrodes will store operational data such as minimum and maximum pH/mV readings, runtime, and minimum and maximum temperature (pH only), for troubleshooting and operational evaluation. The 2751 self-configures for pH or ORP operation via automatic recognition of the electrode type. The optional EasyCal feature allows simple push-button calibration and includes an LED  indicator for visual feedback.

pH/ORP Smart Sensor – Features

  • Probe health monitoring, glass impedance, and broken glass detection
  • Memory chip interface that allows for transferable calibration, runtime data, and manufacturing information
  • In-line integral mount and submersible installation versions
  • Automatic temperature compensation
  • Auto-configuration for pH or ORP operation
  • Optional EasyCal calibration aid with automatic pH buffer recognition for 4, 7, and 10 pH and ORP  solutions: quinhydrone saturated pH 4 or 7 buffers and Light’s Solution +469 mV
  • Junction boxes for convenient wiring
  • Patented DryLoc® connector provides a quick and secure connection to the sensor

Datasheet

Description

pH/ORP Smart Sensor | 2751

Technical Specifications

General
Compatible Electrodes DryLoc® pH and ORP Electrodes,
Models 2724-2726 | 2734-2736 | 2744-2747 | 2756-2757 Wet-Tap | 2774-2777
Operating Range pH -1 to 15 pH
ORP ±2000 mV
Response Time pH Electrode dependent
ORP Application dependent
Materials In-line PBT (thermal plastic polyester)
Polypropylene (retaining nut)
Submersible CPVC

Electrical

Cable 4.6 m 15 ft 3-conductor shielded (3-2751-1 in-line and the 3-2751-3 or -4
submersible sensor electronics only)
See ordering information for additional cable sizes
22 AWG For 9900, 9950, and 4 to 20 mA max.
Cable length is 305 m (1,000 ft).
For 8900, please refer to the Cable Calculation Table of the catalog
for max. cable length.
Power 12 to 24 VDC ±10%, regulated for 4 to 20 mA output
5 to 6.5 VDC ±5% regulated recommended 3 mA max.
for digital (S3L) output
Current Output pH Fixed 4 to 20 mA, isolated, = 0 to 14 pH
(custom scaling available with 0252 tools)
ORP Fixed 4 to 20 mA, isolated, = -1000 to +2000 mV
(custom scaling available from ± 2000 mV with 0252 tools)
Max. Loop Resistance 100 Ω max. @ 12 V 325 Ω max. @ 18 V 600 Ω max. @ 24 V
Accuracy ±32 µA
Resolution ±5 µA
Update Rate 0.5 seconds
Error Indication 3.6 mA | 22 mA | none
Digital (S3L) Output Serial ASCII | TTL level 9600 bps
Accuracy pH ± 0.02 pH @ 25 °C ± 0.02 pH @ 77 °F
ORP ± 1.5 mV @ 25 ° C ± 1.5 mV @ 77 °F
Temperature ≤ 0.4 °C 0.72 °F
Resolution pH ≤ 0.01 pH
ORP 1.5 mV
Update Rate 0.5 seconds
Available Data Raw mV | pH or ORP | Temperature (pH) | Glass Impedance (pH)
Minimum mV (pH) | Maximum mV (pH) | Minimum Temperature (pH)
Maximum Temperature (pH) | Model Number | Serial Number |
Manufacturing Date |Runtime | Slope pH/mV | Measurement Offset | Temperature
Error Indication Open input diagnostic | Broken glass detection (pH) | High Impedance
Input Impedance, Z 1011 Ω

Environmental

Enclosure 3-2751-1 & -2 NEMA 4X/IP65 with an electrode connected
3-2751-1 & -4 NEMA 6P/IP68 with an electrode and
watertight conduit and/or extension pipe connected

Maximum Temperature/Pressure Rating

Submersible 0 °C to 85 °C 32 °F to 185 °F
In-line 0 °C to 85 °C 32 °F to 185 °F
Storage Temperature -20 °C to 85 °C -4 °F to 185 °F
Relative Humidity 0 to 95%, non-condensing (without electrode connected)

Shipping Weight (based on 4.6m (15ft) cable lengths)

2751-2 0.75 kg 1.65 lb
2751-1, -3 & -4 0.64 kg 1.41 lb

Standards And Approvals

CE | FCC
RoHS compliant | China RoHS
Manufactured under ISO 9001 | ISO 14001 | ISO 45001

pH/ORP Smart Sensor | 2751

Additional information

Options

In-Line Smart Sensor with 4.6m Cable, In-Line Smart Sensor with Junction Box, Submersible Smart Sensor with NPT threads, Submersible Smart Sensor ISO 7/1 threads

Brand

Georg Fischer

georg Fischer Signet logo

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