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.
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.
- 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
|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.
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|
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
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)|
Between measuring plant and control rooms, especially when the distance between these places is greater than the length of the standard appropriate electrode cables, the connecting equipment can be an expedient method for connecting sensor cables to a measuring instrument.
The quality of paper for printing or writing should be high and it depends on many parameters. Cobb is one of the parameters, which requires control. Using a retractable fitting, this optimum pH level can be achieved by using Yokogawa's 4-wire pH Analyzer with a suitable, retractable fitting and sensor. Since a separate controller is not required for the dosing pump, this solution provides a cost-saving.
Many Ethanol plants running today are using a combination style pH electrode with a non-flowing reference to measure pH in the Mash Slurry transfer line from the Mash slurry mix tank to cook. The Mash is being pumped out of the Mash Slurry tank is at approximately 180 °F and 40 to 60 psig.
- A Word About Buffers
- pH and ORP Handbook
- Care & Maintenance in High Purity Water (85 KB)
- PH450G/SC450G/ISC450G pH/ORP/Conductivity Converters HART Communication (373 KB)
- Free Programmable Buffer Tables (153 KB)
- PH450 Buffer Tables (124 KB)
- Proper Calibration (104 KB)
- Sensor Diagnostics
- Temperature Compensation (115 KB)
- Wet vs Dry Electrodes, Problems and Solutions (111 KB)
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