Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP Multivariable Analyzer
Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP Multivariable Analyzer Features
• Easy touchscreen operation
• IP66/NEMA 4X 1/2DIN enclosure for field mounting
and panel mounting
• Unique HMI menu structure in 8 languages
• Predefined buffer solutions
• Trending display up to 2 weeks
• On-screen logbooks store calibration data,
configuration changes and events
• Advanced Process Temperature Compensation
• Three sets of preloaded pH buffer standards
Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP Multivariable Analyzer General Specifications
The EXAxt 450 series is designed to combine the superior functionality of the Yokogawa EXA series with the ease of use offered in pocket computers (PDA).
The PH450G offers the best accuracy in the industry by combining the pH measurement with advanced temperature compensation functionality, preloaded calibration standards and stability checks.
The PH450G is a true multivariable analyzer that combines pH with Temperature and ORP (Redox) measurement and all these measurements can be utilised through the different output functions: two mA current outputs, four independent SPDT contact
outputs and HART®. Both DD and DTM files are available for direct connection to HART® Handheld terminal, HMI monitor and Pactware PC configurator.
The PH450G offers full functionality with PID control on either mA output(s) or on contact output(s) and with integral wash function.
Most important requirements for Electrochemical Analyzers are reliability and repeatability. This is guaranteed in PH450G sensor diagnostics impedance monitoring of both pH and reference cell. In addition to this a dynamic sensor checking coupled with the wash cycle function assure trouble free and accurate analysis with a minimum of maintenance.
Truly unique is the EXAxt 450 series in the Human Machine Interface. The high resolution graphical display and the touchscreen operation make all information visible to the operator. Configuration with the touchscreen is as easy as operating a PDA.Simply choose the language of choice and on screen instructions assure that the best configuration for the application is obtained.
| 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)
|
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We mainly supply Yokogawa flow meters, Emerson 475 field communicator, Emerson AMS Trex Device communicator, Siemens pressure transmitter, Honeywell transmitter, and the Honeywell BW gas analytics.
Wuhan Xieyuan Automation Equipment Co., Ltd
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