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Eutech Instruments

Eutech Instruments

alpha-pH1000 1/4 DIN pH/ORP Controller
From Eutech Instruments


Industrial Process Controllers & Monitors

alpha,pH1000,1/4 DIN,pH,ORP,Controller,Eutech,Instrumentsalpha-pH1000 1/4 DIN pH/ORP Controller

  • Built-In Programmable Limit, Proportional (Pulse Length or Pulse Frequency) - ideal for precision process control applications

  • User-Customization through Advanced Setup Menu offers flexibility in matching the controller's functions to suit individual's specific requirement

  • Automatic Calibration with Auto-Buffer Recognition eliminates mistakes during calibration

  • Symmetrical Mode Operation eliminates electronic noise problems when used with solution ground

  • One-Point Online Calibration without shutting down the lin

  • Hold Relay for use with float switches/flow switches and other controllers as a failsafe function

  • Level Password Protection prevents un authorized tampering with settings

  • 0 to 2000 Second Time Delay Adjustment on control and alarm delays

  • Galvanically Isolated Scaleable 0-20/4-20 mA Outputs for pH/ORP

  • Wash Contact Relay controls electrodes cleaning systems at desired duration and frequency

  • Choice of Glass or Antimony Electrode for general purpose or hydrofluoric acid applications

  • 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

  • Large Dual Display shows pH (or ORP) with temperature simultaneously - features clear multiple icons, set points, and status messages

  • Choice of Temperature Sensor Pt100/Pt1000 with 2-wire or 3-wire temperature input selection

  • Easy Installation and Wiring with detachable plug-in connectors

alpha,pH1000,1/4 DIN,pH,ORP,Controller,Eutech,Instruments E-Brochure

alpha,pH1000,1/4 DIN,pH,ORP,Controller,Eutech,Instruments Instruction Manual


General: Useful for any batch or on-line type application that requires accurate pH or ORP control.

Water Purification/Treatment: Use for batch and on-line control of incoming process water, rinse water treatment, recirculating system and waste water treatment.

Industrial: Ideal for chemical processing, food processing. aquarium, pharmaceutical, hydroponics and waste control industries.

Regulatory: Hook to recorder to document data for regulatory compliance.


Product Specification

pH Range -2.00 to 14.00 pH
Resolution & Accuracy 0.01 pH & 0.01 pH
mV Range -1000 to 1000 mV / 0 to 100% (for -100 to 100 mV)
Resolution & Accuracy 1 mV / 0.1% & 1 mV
Temperature Range -9.9 to 125 C
Resolution & Relative Accuracy 0.1 C & 0.5 C
Temperature Sensor Pt 100/ Pt 1000 (jumper selectable)
Temperature Compensation Auto / Manual (reference at 25 C)
Set Point and Controller Functions
Function (Switchable) P/PI control (Pulse Length / Pulse Frequency); Limit Control; Off
Hysteresis 0.1 to 1 pH or 1 to 10.0% / 10 to 100 mV
Adjustable Period with Pulse Length Controller 0.5 to 20 seconds
Adjustable Period with Pulse Frequency Controller 60 to 120 pulses/min
Proportional Range 10 to 500%
Integral Action Time (IAT) 0 to 999.9 minutes
Pickup / Dropout Delay 0 to 2000 seconds
Switching pH Hysteresis 0.1 to 1 pH
Switching ORP Hysteresis 1 to 10.0% / 10 to 100 mV
Contact Outputs, Controller
2 potentialfree change-over contacts
Switching Voltage / Current / Power Max 250 VAC / Max 3A / Max 600VA
Alarm Functions
Function (Switchable) Launching or Pulse
Wash cycle 0.1 to 199.9 hrs
Wash direction 1 to 9999 s
Pickup Delay 0 to 2000 seconds
Switching Voltage / Current / Power Max 250 VAC / Max 3A / Max 600VA
Electrical Data and Connections
Power requirement 100/ 2200CD (jumper selection)
Frequency 48 to 62Hz
EMC Specifications Emissions: according to EN 50081-1
Susceptibility: according to EN 50082-1
Signal Output 0/4 to 20mA, galvanically isolated
Load Max. 600 Ω
pH/ORP BNC, screw terminals
Connection Terminal Terminal blocks 5-pole/ 17-pole, removable
Main Fuse/ Fine Wire Fuse Slow-blow 250 V/ 100 mA
Environmental Conditions
Pollution Degree II
Transient Overvoltage Category II
Altitude Up to 2000 m
Maximum Relative Humidity 80% up to 31C decreasing linearly to 50% at 40C
Power Supply Mains supply voltage fluctuations not exceeding 10% of the nominal voltage
Ambient Temp. Operating Range -10 to 50 C
Mechanical Specifications
Dimensions 175 x 96 x 96 mm
Weights Max. 0.7kg
Material ABS with polycarbonate
Insulation IP 54/ IP 40


About Us

Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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