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pH-HR Data Logger

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The pH-HR is a small, three channel, high resolution (12 bit) pH and Temperature Datalogger. The logger connects to an external pH probe. As many pH probes have a built in Pt-100 temperature sensor there is a logger input for this sensor. It also has an internal thermister sensor inside the logger. This logger has been designed to use the Wedgewood Analytical (Innovative Sensors) Model 11 and Model 12 pH probes.
Model 11 Probe Information  
Model 12 Probe Information
This logger should work with other pH probes but it has only been tested with the Innovative Sensors Model 11 and Model 12 probes.

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pH Input:
External Sensor Connector
4 pin Switchcraft Plug (EN3C4M )
1 pH Probe Positive
2 pH Probe Negative
3 Pt-100 A
4 Pt-100 B
pinout4.gif (1972 bytes) View from Front of Socket or Rear of Plug
Accuracy ± 0.1pH
Resolution ± 0.1pH
Pt-100 Input:
External Sensor Connector Same 4 pin Switchcraft Plug as pH input
See pH
1 pH Probe Positive
2 pH Probe Negative
3 Pt-100 A
4 Pt-100 B
Accuracy ± 1º C
Resolution ± 0.5º C
Internal Temperature:
Sensor Type Thermister
Linear accuracy over range ± 0.3º C (0º C to 70º C)
Repeatability ± 0.1º C
Long term stability ± 0.1º C
Working Temperature -30º C to +70º C
Storage Temperature -30º C to +70º C
Sampling Rate
1 second minimum
10 hours maxium
in 1 second intervals
Storage capacity
522,240 samples logging pH only 
261,120 samples logging pH and Temperature
362 days with 1 min logging interval, pH only
4.9 years with 5 min logging interval, pH only
Two independent Alarms
Triggered on any combination of six user configurable Alarm Conditions
Both alarms can be configured to send SMS messages
Conditions can be setup to reset alarms
Start modes
Start immediately
Start on date/time
Start on condition (eg pH > 6.2pH
Stop modes
Stop when memory is full
Stop on date/time
Loop around (continues logging)
Logging Modes
Each channel can be set to log any combination of: 
  • Point readings
  • Average reading
  • Maximum reading
  • Minimum reading
User Replaceable
7.2V Lithium battery pack (must be ordered)
One to Five years depending on usage. 
The data is retained in the case of battery failure.
Battery Status Monitor in OmniLog Software
Download Time 9min 30sec for Full Logger
Case material 304 Stainless tube
Screw on end cap Plated brass
Weight 148g
Size 20mm diameter X 182mm long
Temperature Compensation Temperature compensation is performed within the logger so temperature data does not have to be logged if it is not required.
Calibration The pH input is calibrated in the factory at 25º C with a traceable calibrated voltage source.
Temperature compensation is then checked at 0º C, 50º C and 100º C. 

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