4000 PH pH and ORP Analyzer

Streamline Water and Steam Monitoring with Waltron’s All-New pH/ORP Analyzers

Meet the Waltron 4000 PH, the perfect solution for precise pH and ORP monitoring. It is engineered for unparalleled accuracy, features a versatile single-channel design compatible with a broad spectrum of electrodes, and includes robust temperature compensation. Encased in a durable IP66 NEMA 4X enclosure, the 4000 PH offers flexible installation options and user-friendly operation with its intuitive interface and backlit LCD display. Experience the peace of mind that comes with reliable water and steam analytics crafted to meet the demands of ultra-pure and general-purpose applications.


  • Single-Channel pH/ORP for use with a wide range of glass and redox electrodes using Pt1000 or Pt100 Temperature compensation

  • Displays pH reading and electrode mV values

  • Easy to install and configure with two relays, two digital inputs, and two 4-20mA outputs

  • Durable 1/2-DIN IP66 NEMA 4X enclosure can be panel, surface, or pipe-mounted

  • Simple, intuitive menu, with soft-touch buttons and a large, clear LCD backlit display

  • The instrument can be adjusted in off-line mode

  • Choice of 12-30VDC or 90-265VAC versions


3.75″, 240 x 128 dot, LCD module

Display backlight
Can be set to flash to indicate the instruments alarm status

English, French. Spanish and Italian

5, silicone rubber tactile feedback micro-switched

Digital inputs
2 contact inputs for remote activation of user-defined operations. It can be configured to operate in either normally open or normally closed modes.

Current output specification
Single current output, selectable 0-20mA or 4-20mA into 750 ohms max, fully isolated to 2kV. Expandable across full operating range and offset anywhere in that range. Loop fault detection.

Setpoints and control relay specification
2 normally open fully configurable setpoints with volt-free contacts for each relay. Rated at 5A @ 30vDC / 5A @ 250vAC.

MicroSD card interface
Enables on-site
upgrading of instrument software. SD, SDHC and
SDXC-FAT32 cards supported.

Measurement input
Single-ended or differential with solution ground.
pH: Separate glass and reference electrode pair. Combination electrode. Redox: Separate glass and reference electrode pair. Combination electrode. Other manufacturer’s sensors can be accommodated.

Connection cable
Up to 30 metres (no preamp required)

Measurement ranges
0.00 to 14.00 pH, -1999mV to +1999mV.

± 0.05 pH, ± 3mV.

Linearity and Repeatability
± 0.1 % of range.

Calibration methods
Automatic 4pH / 9pH buffer calibration, manual slope and offset adjustment. Both methods feature post-calibration electrode condition indication.

Custom buffer
13 point 4pH / 9pH custom buffer entry pre-loaded with standard LTH buffers, alternative buffers also supported by user entry.

Temperature sensor
Pt1000 & Pt100 RTD input. Up to 30 metres of cable. Temperature sensor can be mounted in the sensor or separately.

Range of temperature and compensation and compensation type

-10 °C to +150 °C (+14 °F to + 302 °F) for full specification.
Automatic or manual -10 °C to +150 °C


Ambient operating conditions
Temperature -20 to +55°C, relative humidity 5 to 95%. non-condensing.

Power supply
Universal 90-265vAC, 10W max.
LV Option 12-30vDC, 5W max._


Instrument housing
Front panel 144 x 144mm (Panel-cut out: 138 x 138mm)
Depth behind panel: 77mm maximum
Hinged / retained front

Ingress protection rating (IEC 60529 protection rating)

Technical Documents

  • Coming Soon!