Pure Water and Ultrapure Water pH/ORP Analyzer

Intended for the pure water and ultrapure water applications found in the semi-conductor, power, water and pharmaceutical industries. These analyzers work with any pH/orp sensor that does not have a preamplifer built onto the sensor.

The new EXAxt 450 series builds on the superior functionality of the industry leading Yokogawa EXA series by enhancing the EXA's proven operation and application flexibility. The Model 450 series feature a uniquely simple touch screen menu structure that offers a choice of multiple languages.

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

In addition to dynamic sensor checking, the Model 450 offers a wash cycle function to assure trouble free and accurate analysis with a minimum of maintenance. The EXAxt 450 also offers full application functionality with PID control on either mA output(s) or on contact output(s).

The PH450 combines pH with Temperature and ORP (Redox) measurement that can be utilized though different output functions: two mA outputs, four independent SPDT contact outputs and a digital HART signal is superimposed on mA1. This information can be used to generate additional current and contact outputs in the HIM monitor and in maintenance optimization programs like PRM or AMS.

The EXAxt 450 series provides a truly unique Human Machine Interface. The high resolution graphical display and touch screen operation provides all information 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 touch screen operation with menu structure in 5 languages
  • Dual High Impedance Capability, allowing for Differential pH/ORP measurements  
  • Enhanced diagnostics, process trending graphics andon-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)
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)
pH input ≤0.01 pH
ORP input ≤1 mV
Temperature ≤0.3℃ (≤0.4℃ for Pt100)
Step response  < 4 sec for 90% (pH 7 - pH 4)
Overview:

The lifetime of a pH sensor has a significant impact on the overall annual costs of a pH measuring loop. Optimizing four key factors will decrease these costs and optimize process control and overall plant efficiency.

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