pH 502

pH Digital Controller with Matching Pin and PID Control

The pH 502 series of controllers offer many features to increase the level of control available in your plant. These instruments can be configured to utilize P, PI, PID controlling. With this feature, the pH 502 takes the place of three instruments that only allow one configuration each. The pH 502 line includes models that incorporate control through analog output to drive any compatible device, such as an electrovalve or pump. Models equipped with a solid state relay are also available to ensure maximum life of the switching device. Each model has a differential input for a grounding bar to extend electrode life. Several models come with an RS485 port, as well as analog recorder output.

Fail Safe Alarm System protects against power interruption or line failure. 1, 2 or 3 point automatic calibration and manual or Automatic Temperature Compensation complete the features of this controller.

Choose your configuration
pH 502421-1 dual setpoint with SSR relay, on/off and PID controls, analog output, 115V
pH 502421-2 dual setpoint with SSR relay, on/off and PID controls, analog output, 230V and PID controls, RS485 output, 230V

Specifications
Range pH 0.00 to 14.00 pH
Temperature -9.9 to 120°C
Resolution pH 0.01 pH
Temperature 0.1°C
Accuracy @ 20°C pH ±0.02 pH
Temperature ±0.5°C
Input Impedance  1012 Ohm
pH Calibration  automatic, one, two or three point, at pH 4.01, 7.01, 10.01
Temperature
Compensation  automatic (with Pt100 probe) or manual from -9.9 to 120°C
Outputs  digital: RS485 bi-directional opto-isolated; or analog, galvanically isolated: 0-1 mA, 0-20 mA and 4-20 mA, 0-5 VDC, 1-5 VDC and 0-10 VDC
Set Point Relay  1 or 2 contact outputs SPDT 5A-250 VAC, 5A-30 VDC (resistive load) or 1 or 2 Solid State Relay (SSR), 1A, 250 VAC (resistive and inductive load), fuse protected (2A, 250V fast fuse)
Alarm Relay  one contact output SPDT, 5A-250 VAC, 5A-30 VDC (resistive load), fuse protected (5A, 250V fuse)
Power Supply  115 VAC ±10% or 230 VAC ±10%; 50/60 Hz
Power Consumption  15 VA
Over Current
Protection  400 mA 250V fast fuse
Environment  0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions  panel cutout: 140 x 140 mm, instrument: 144 x 144 x 170 mm
Weight  1.6 kg (3.5 lb.)