pH/ORP control is easy with the Alpha pH 200 limit controllers. Featuring 6 sub-menus accessible via a four-button keypad for quick, easy setup and calibration, the controller/transmitters also come with two levels of password to protect against unauthorised tampering.
For heightened security, use the Alpha pH 200 limit controller which only allows access to calibration and set-up menus via passwords.
Easy push-button calibration with USA/NIST buffer recognition for fast, effortless calibration. Controller freezes data transmission and relay activities during calibration and maintenance
Symmetrical mode of operation for clear, uninterrupted readings even in electronically noisy environments
Two SPDT relays with independent hysteresis – effective high/low set-points limit control with minimal relay-chattering
Choice of automatic or manual temperature compensation. Three-wire system compensates error due to cable resistance
85 to 250 VAC. 50/60 Hz or DC variable input allows controller to be used with a wide range of supply voltages
Full-scale 4 to 20 mA galvanically isolated current
output for process control
for virtually any batch type application where
pH or ORP control or adjustment is needed.
Use as ORP monitor for ozone systems and general
purpose pH monitor for all types of water
treatment and chemical processes.
for pH or ORP control in fish ponds and tanks.
Use to treat batches of incoming process water,
rinse water treatment, recirculating system
and wastewater treatment. Suitable for pH
or ORP control of plating tanks and chemical
processing tanks. Ideal for low cost monitor
with alarms for batch and process applications.
Perfect for wastewater neutralization in small
and medium sized batches.
0.00 to 14.00 pH
-999 to 1000 mV
-10 to 110 ºC
Pt100; 2 or 3 wire
Auto/manual (0 to 100 ºC)
Point And Controller Functions
Set point 1 (SP1)/
set point 2 (SP2)
0.00 to 14.00 pH or -999 to 1000 mV
Switching pH Hysteresis
0.00 to 2.00 pH
Switching ORP Hysteresis
0 to 300 mV
2 SPDT relays
Max. 250 VAC / max. 3 A / max. 600 VA
Data And Connections
4 to 20 mA scalable outputs for pH/ORP, galvanically isolated