Notice: This product was discontinued on See this replacement product:

Multi Channel 4-Wire Analyzer FLXA402

The PH450 pH analyzer provides the best accuracy in the industry, featuring an advanced temperature compensation functionality, preloaded calibration standards, stability checks, and online sensor and analyzer diagnostics to provide verifiable results.

This four-wire, multivariable analyzer combines pH with temperature and ORP (Redox) measurement, all of which can be utilized through the different output functions: two mA current outputs, four independent SPDT contact outputs, and HART. Dynamic sensor checking and wash cycle functions assure trouble free and accurate analysis with minimum maintenance.

Unique Human Machine Interface

The PH450 has a high-resolution, simple touchscreen menu structure with five language options, so information is clearly visible and easily accessible to the operator. Simply select the language of choice and on-screen instructions assure that the best configuration for the application is obtained.

Unique Human Machine Interface

Ideal for Ultrapure Water Applications

The PH450 offers self-diagnostics and process temperature compensation to provide accurate pH measurements in high purity water. One of these temperature compensation methods, the NEN6411 algorithm, takes into account the dissociation of water in strong acid and alkaline solutions, which is especially useful for pH measurement in Pure and Ultrapure water as found in Power Generation Water Chemistry.

Additional Features

Capable of analyzing pH, ORP or rH and Temperature measurements at the same time with the same sensor
Full PID control possible for both acid and alkaline addition simultaneously
Dual High Impedance Capability, allowing for Differential pH/ORP measurements
Enhanced diagnostics, process trending graphics and on-screen logbooks for data storage
Two mA-outputs and four SPDT relay contacts with display indicators
Hart® Communications
FM Class 1, Div.2, Group ABCD, T6 for Ta-20 to 55°C
IP66/NEMA4X 1/2 DIN enclosure for Field Mounting and Panel Mounting
Three sets of preloaded pH buffer standards (NIST, US and DIN) cover most commonly used pH calibration practices
Supports many temperature compensation elements and sensor types

Measuring principle	Electrochemical
Input ranges	pH: -2 to 16 pH ORP: -1500 to 1500 mV rH: 0 to 100 rH Temperature: -30 to 140 deg C (Pt1000)
Transmission signals	General: Two isolated outputs of 4 to 20 mA DC with common negative. Maximum load 600 Ω. Bi-directional HART® digital communication, superimposed on mA1 (4 to 20 mA) signal. Output function: Linear or Non-linear (21-step table) output for pH, temperature, ORP or rH. Control function: PID control. Burn out function: Burn up (21.0 mA) or burn down (3.6 mA) to signal failure accorded with NAMUR NE43. Hold: The mA-outputs are frozen to the last/fixed value during calibration/commissioning.
Contact outputs	General: Four SPDT relay contacts with display indicators. Switch capacity: Maximum values 100 VA, 250 V AC, 5 A Maximum values 50 W, 250 V DC, 5 A Status: High/Low process alarms, selected from pH, ORP, rH and temperature. Configurable delay time and hysteresis. Failure annunciation. Control function: On/Off, PID duty cycle or pulsed frequency control. Wash: Contact can be used to start manual- or interval time wash cycles. Hold: Contact can be used to signal the Hold situation. Fail: Contact S4 is programmed as fail-safe contact.
Contact input	Remote wash cycle start.
Temperature compensation Function	Automatic or manual. Compensation to Nernst equation. Process compensation by configurable temperature coefficient, NEN6411 for water or strong acids/bases or programmable matrix.
Calibration	Semi-automatic 1 or 2 point calibration using pre-configured NIST, US, DIN buffer tables 4, 7 & 9, or with user defined buffer tables, with automatic stability check. Manual adjustment to grab sample.
Display	Graphical Quarter VGA (320 x 240 pixels) LCD with LED backlight and touch screen.
Housing	Cast Aluminum housing with chemically resistant coating; Polycarbonate cover with Polycarbonate flexible window, Protection IP66/NEMA 4X/CSA Type 3S
Power supply	PH450G-A: Ratings; 100 to 240 V AC, Acceptable range; 90 to 264 V AC Ratings; 50/60 Hz, Acceptable range; 50 Hz ±5%, 60 Hz ±5 % Power Consumption; 15 VA PH450G-D: Ratings; 12 to 24 V DC, Acceptable range; 10.8 to 26.4 V DC Power Consumption; 10 W
Environment and operational conditions	Ambient temperature: -20 to 55℃ (-5 to 130℉) Storage temperature: -30 to 70℃ (-20 to 160℉) Humidity: 10 to 90 % RH at 40℃ (100℉) (non-condensing)