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pH-HR Data Logger

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.

Specification:
	pH Input:
		External Sensor Connector	4 pin Switchcraft Plug (EN3C4M ) Weatherproof IP66
		Pinout	1 pH Probe Positive 2 pH Probe Negative 3 Pt-100 A 4 Pt-100 B 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
		Pinout	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
	Logger:
		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
		Alarms	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
		Battery	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.