Hanna Instruments PH500121-1 Digital Proportional pH Process Controller, 0.00 to 14.00 pH, 115V Input Voltage, 4 MHz, Analog Output
The Hanna Instruments pH 500121-1 is a single setpoint pH controller used for industrial process control, and has Automatic Temperature Compensation (ATC) or manual temperature compensation, automatic calibration, a multilevel LCD screen, proportional control, analog output, and a failsafe alarm system. A pH controller is used in industrial control systems to calculate the difference between measured pH and a desired setpoint. The controller then adjusts the pH as needed using process control inputs. The setpoint relay of this meter allows one point between 0 and 14 pH to correspond to the analog output spans. The meter has manual temperature compensation between -9.9 and 120 degrees C or ATC with a Pt100 probe (not included). The dual-level LCD of this controller simultaneously shows the current measurement and the current temperature and push button password programming prevents tampering.
The modulated output of the proportional control may reduce chemical use. The meter has automatic one-, two-, or three-point calibration at pH 4.01, 7.01, and 10.01. Output is analog and galvanically isolated and can drive any compatible device, such as an electro valve or pump. The setpoint relay consists of a single-pole double-throw (SPDT) switch with 5A-250 VAC, 5A-30VDC resistive load that is fuse-protected by a 2A, 250V fast fuse to prolong switching device life. A failsafe alarm system protects against power interruption or line failure. The alarm relay is a one-contact output single-pole double-throw (SPDT) 5A-250VAC switch with a 5A-30VDC resistive load and fuse-protected with a 5A, 250V fuse. Overcurrent protection is provided by a 400 mA 250V fast fuse. The maximum oscillation frequency is 4MHz. Differential input provides ground loop protection. The input impedance is 10 E 12 Ohm. The power supply is 115VAC and power consumption is 15VA. The pH 500121-1 controller comes with mounting brackets and instructions.
| pH range | 0.00 to 14.00 |
| Temperature range | -9.9 to 120 degrees C |
| pH resolution | 0.01 |
| Temperature resolution | 0.1 degrees C |
| pH accuracy | + or €“ 0.02 |
| Temperature accuracy | + or €“ 0.5 degrees C |
| Operating temperature | 0 to 50 degrees C, 32 to 122 degrees F |
| Operating humidity | 95 percent maximum relative humidity non-condensing |
| Panel cutout dimensions | 140 x 140mm (H x W) |
| Instrument dimensions | 144 x 144 x 170mm (H x W x D) |
| Weight | 1.6kg/3.5lb. |
H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.
A pH meter, also called a sensor or tester, is a device used to measure the acidity or alkalinity of a substance. A pH meter has either a portable or a benchtop body. Many portable meters are handheld devices. Some testers have an internal sensor, and may have a tip and body that fit inside of a container for measurement. A meter is commonly used in many different environments from laboratories to field research and manufacturing facilities. Researchers, manufacturers, and hobbyists use a pH meter in aquaculture, agricultural, wine-making, and water-testing, and for scientific applications. Some pH meters may measure additional parameters such as dissolved oxygen (DO), conductivity (also called electro-conductivity or EC), temperature, total dissolved solids (TDS), salinity, resistivity, or oxygen reduction potential (ORP)/mV.
Hanna Instruments manufactures analytical instrumentation and supplies, including pH meters, electrodes, chemical reagents, and buffer solutions. The company, founded in 1978 and headquartered in Woonsocket, RI, meets International Organization for Standardization (ISO) standard 9001.
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