HACH 3400 Contacting conductivity sensor

Contacting conductivity sensor

HACH 3400

The GLI 3400 series conductivity probes use different cell constants to cover different measuring ranges, achieving high measurement accuracy in any measuring range from ultrapure water to boiler water, at various temperatures, and in other demanding environments. The GLI 3400 series conductivity probes are available in four models, each suitable for different applications, with flexible installation options.

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3422 Series Compression Conductivity Probe

Material: Titanium
Typical applications: Ultrapure water, deionized water
Installation method: Flow-through or insertion type

3433 Series Non-metallic General-purpose Conductivity Probe

Material: Graphite
Typical applications: Surface water
Installation method: Insertion or immersion type

3444 Series High-temperature Conductivity Probe

Material: Titanium or 316 stainless steel
Typical applications: Boiler water, condensate
Installation method: Insertion type

3455 Series Sanitary Conductivity Probe

Material: 316 stainless steel
Typical applications: Pharmaceutical, sanitary, food, industrial water
Installation method: Insertion type flange mounting

Features and Benefits

Each conductivity probe is tested to obtain its unique four-digit electrode constant. The electrode constant is used together with GLI's DRY-CAL calibration method to ensure high accuracy of conductivity probe measurement;
This series of conductivity probes offers a variety of material options, with high temperature response performance, capable of handling any measurement range from ultrapure water to boiler water, as well as various harsh environments;
Multiple conductivity probe installation methods: compression mounting type, non-metallic general-purpose type, boiler/condensate type, and sanitary flange type.

Calibration Method

The conductivity measurement electrodes are calibrated using the DRY-CAL calibration method. Each conductivity electrode undergoes conductivity slope measurement and temperature offset measurement at the factory, and each conductivity probe is marked with its factory calibration data. Operators only need to input the calibration data during installation, and the conductivity electrode is ready for operation.

Technical Specifications

Measuring range: Maximum range 0-200,000µS/cm. The specific measuring range varies with different electrode constants:
Electrode constant Measuring range
Conductivity ( µS/cm) Resistivity (Megohm)
0.05 0～100 0.002～20
0.5 0～1000 0.001～20
1 0～2000 Not applicable
5 0～10000 Not applicable
10 0～200,000 Not applicable
Sample temperature: -20～200℃；
Maximum flow rate: 3m/s
Pressure range: 100psig at 200℃；
Accuracy: ± 2% of reading >20 μS/cm
Probe weight: 0.45kg

Ordering Guide

Source: Public information from HACH Water Quality website

Municipal Wastewater Treatment

Municipal Wastewater Treatment · Controllers and Sensors — Application Case

Site Conditions

This is a Municipal Wastewater Treatment customer whose plant is at the inlet, biological and outlet stages of a municipal plant. The main task was online water monitoring with a controller and sensor combination.

The Problem

The difficulty lies in high solids and corrosive fractions, with large diurnal flow swings; at the same time effluent parameters drift and probes foul with sludge and biofilm. Specification therefore means matching each controller channel to its sensor type.

What We Did

We took a Hach channel approach — supplying against the Hach original part numbers. Delivery was built around matching each controller channel to its sensor type, with point-by-point checks on: stable compliance with Grade 1A discharge limits and online data reporting.

Operating Outcome

In service the system performs as intended — factory-matched combinations that make faults easier to locate, with routine maintenance falling noticeably.

Food & Beverage

Food & Beverage · Controllers and Sensors — Application Case

Application Context

dosing, pasteurising, filling and CIP stages is a typical Food & Beverage duty. The project started from Controllers and Sensors, focusing on online water monitoring with a controller and sensor combination.

Process Constraints

frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, and syrups, dairy and beverages that scale easily, under strict hygienic requirements only amplify it. The Controllers and Sensors specification must therefore cover matching each controller channel to its sensor type.

Delivery Approach

Delivery was handled as the Hach channel — supplying against the Hach original part numbers. Execution centred on matching each controller channel to its sensor type, together with food-safety and hygienic design per 3-A / EHEDG.

Field Results

Operation shows the benefit clearly — factory-matched combinations that make faults easier to locate, with confidence in this measuring point improving markedly.

Chemical & Pharmaceutical

Chemical & Pharmaceutical · Controllers and Sensors — Application Case

Customer Profile

The typical setting in Chemical & Pharmaceutical is reactors, metering vessels and finished-product tanks. The measuring point is Controllers and Sensors; the focus is online water monitoring with a controller and sensor combination.

Key Difficulties

Conditions are highly corrosive media with solvents and crystallisation, partly in explosive atmospheres and, on top of that, corrosion plus Ex protection shortens instrument life and makes downtime costly, which a standard configuration cannot handle for long. The design therefore starts with matching each controller channel to its sensor type.

Implementation

The scope ran through the Hach channel: supplying against the Hach original part numbers. Technically it hinges on matching each controller channel to its sensor type, and on these requirements: Ex certification and GMP traceability of records.

Customer Benefit

In practice this means factory-matched combinations that make faults easier to locate, which cut the workload on the site maintenance team.

Power & Energy

Power & Energy · Controllers and Sensors — Application Case

Project Background

The project covers boiler feedwater, turbine condensate and FGD/DeNOx systems. The work centres on Controllers and Sensors and the core task is online water monitoring with a controller and sensor combination.

Operating Challenges

The medium and duty are characterised by high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. So Controllers and Sensors cannot be specified generically — it calls for matching each controller channel to its sensor type.

Solution

The Ainstru engineering team worked through the Hach channel: supplying against the Hach original part numbers. The configuration involves matching each controller channel to its sensor type, with these requirements in view: compliance with power-industry codes and unit availability targets.

Results

Since start-up the system has run steadily; the practical result is factory-matched combinations that make faults easier to locate.

HACH

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3400 Contacting conductivity sensor