Waltron 3051 Hardness Analyzer

3051 Hardness Analyzer

Range: 0-250 ppb

Range: 0-1 ppm

The Waltron 3051 Calcium Hardness Analyzer is the industry’s only online instrument able to deliver accurate and repeatable results for online analysis and control of extreme low-level Calcium hardness in clean water applications. The 3051 uses Waltron’s proprietary colorimetric chemistry to achieve the most accurate results (+/- 5ppb at the lowest levels) in applications where hardness must be strictly managed. An enhanced color touchscreen user interface makes the 3051 easy to operate and configure, and the clever fast-loop reservoir feature allows accurate measurement independent of flow. The 3051 automates manual bench test analysis for accurate and reliable results, greatly enhanced visibility on changes in hardness concentrations, and earlier detection of potential problems.

  • Accurate and wide-range analysis

  • Multi-stream available

  • Fast loop reservoir

  • Adjustable cycle and calibration frequency

  • Automatic calibration and validation (QA/QC)

  • Compact design

  • Color touchscreen display

  • Grab sample capability

  • Internal datalogger

  • Low reagent level alarm

  • Automatic start/stop based on sample flow detection

  • Minimal analyzer maintenance


0–250 ppb, 0-1 ppm


+/– 5 ppb or +/–3% of full scale, whichever is greater


+/– 5 ppb or +/– 5% of reading, whichever is greater

Analysis Time

10 min, batch process

Sampling Frequency (Cycle Time)

One reading every 20 mins, adjustable

Required Maintenance

Once a month replenish reagents, Quarterly replace tubing

Reagent Consumption (approximate)

3 reagents, 2L each per month

Sensor Classification

Colorimetric with glass flowcell and LED source


Boiler water, and cooling water

Ambient Temperature Range

10-45ºC analyzer (50-113ºF)

Atmospheric Pressure Range

No Limits


Up to 90% not condensable

Unit Dimensions

Height=23.6”(60 cm), Width=15”(38 cm), Depth=8.3”(21 cm)

Positioning and installation details

Wall mounting or with bench support, panel mounting (optional)


17 kg (37.5 lbs.)

Degree of Protection

IP55 (NEMA 4): Wet section, IP65 (NEMA 4x): Electronics


2 or 4 configurable alarm relays

Power Supply

110-220Vac, 50-60 Hz 80 VA

Certification (on request):

Meets low voltage and low electromagnetic compatibility directives


Temperature Range

5-55ºC (41-131ºF)

Inlet Sample

100–500 ml/min, atmospheric, flexible tubing O.D. 1/4″(6 mm)

Outlet Sample

Atmospheric, waste tubing O.D. 3/8″(9 mm)



Sample Conditioning Requirements

Filtering between 10 and 60 micron, depending on the matrix, needed only to avoid clogging.

Materials in Contact with Sample

Glass, Silicone, Plexiglass, Stainless Steel AISI 316


Analog Outputs:

4-20mA (galvanic isolator module available as option) or 0-5V

Serial I/O for Signals:

Serial data output RS232 standard, RS485 available as option


Single/Multi Point

Multi-Point: zero and mid range

Matrix Corrections

Yes, sample blank correction



Technical Documents