home site map contact

Field/Laboratory/ Industrial

Instruments, Controllers & Sensors



Process Control Instruments : pH / Redox : Industrial Online pH / Redox(ORP) Monitor / Controller (Alpha PH200)

Our competitively priced Alpha 200 Process Control pH / Redox (ORP) meter shares many of the advanced features of the Alpha 2000 and 1000 units, as with the Alpha 1000, it has the advantage of being Panel Mountable and is ideal for such applications as pH control in fume cupboards or where a panel mountable meter is required. The Alpha pH200 has Galvanically Isolated 4-20 mA Output also Two Level Password Protection preventing un authorized tampering with settings. Applications for the Alpha pH200 include:

General : 

Ideal 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.

Aquaculture : 

Use for pH or ORP control in fish ponds and tanks.

Industrial : 

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

Main Features :

  • User-Customisation through Scrolling Menu, 14-Segment LED - intuitive user interface guides user easily through setup functions
  • Symmetrical Mode Operation eliminates electronic noise problems when used with solution ground
  • Galvanically Isolated 4-20 mA Output for remote monitoring or hardcopy recording
  • Universal Power Supply Input from 85 to 250 VAC/DC allows use at multiple sites and withstands voltage fluctuations
  • Two Level Password Protection prevents un authorized tampering with settings
  • Automatic Temperature Compensation with 3-wire Pt 100 system ensures accurate readings under fluctuating temperatures
  • Adjustable Hysteresis (Dead Band) prevents rapid contact switching near set point
  • Non-Volatile Memory retains all stored parameters and calibration data even if power fails
  • Easy Installation and Wiring with detachable plug-in connectors


Product Code

pH Range 0.00 to 14.00 pH
Resolution & Accuracy 0.01 pH & 0.01 pH
mV Range -999 to 1000mV
Resolution & Accuracy 1/ 2.0 mV
Temperature -10 to 110C
Resolution & Accuracy 0.1/ 0.5C
Sensor Pt 100 (3-wire)
Temperature Compensation Automatic/ Manual (0 to 100C)
Set-point and Controller Function
Function Limit Control
Switching pH/ ORP Hysteresis 0.00 to 2.00 pH/ 0 to 300 mV
Contact Outputs, Controller 2 SPDT relays
Switching Voltage/ Current/ Power Max 250 VAC/ Max 3A/ Max 600 VA
Electrical Data and Connections
Power Requirements  85 to 260 VAC, 50/60 Hz or DC
Signal Output/ Load 4-20 mA galvanically isolated/ 200 ohms
pH/ ORP Input BNC (1012 W  Impedance)
Connection Terminals 3 Detachable connectors (3-pin, 7-pin & 9-pin terminal blocks)
Main Fuse 250 mA, Anti-surge (BUSSMAN S504 + 250mA)
Environmental Conditions
Ambient Temp. Operating Range - 10 to 50 C
Rel. Humidity 10 to 95 % ( non-condensing)
Mechanical Specifications
Dimensions (Control Panel Housing- W X H X D) 96 X 48 X 150 mm
Weight 300g (350g when boxed)

Click Here to View Process Control Instruments

· Home
· Links of interest
· Contact Us



We are proud to announce the launch of the Worlds First CFR 21 Compliant - Windows CE Driven Multi-Parameter 6000 Range of Bench Meters. Ideal for use in industries such as Pharmaceutical, Food & Drug Manufacture and Health & Human Services. Please click here for details.

We accept all major credit/debit cards - please contact us for our best possible prices!; any questions? Why not try our Technical Area where you will find an in-depth explanation of many relevant aspects within the field of electrochemistry! more..


Russell Mainstream Supply Ltd.


Cameron House, 8 Crown Square, Kingskettle, Cupar, Fife, KY15 7PW


Phone: +44 (0)1337 831192

Fax: +44 (0)1337 371192


Email: Sales@rmprocesscontrol.co.uk 



home · links · contact us · site map
Copyright 2005 -- Russell Mainstream Supply Ltd