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CR9051E 5 Volt Fault-Protected Analog Input Module with CR9050EC Easy Connector Module
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The CR9051E is one of the modules used with our CR9000 and CR9000X dataloggers. It is similar to the CR9050, including 14 differential (28 single-ended) inputs, with the addition of fault protection for each channel and a CR9050EC easy connector module. It also has an onboard platinum resistive thermometer (PRT) and a heavy copper grounding bar for thermocouple measurements.

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Benefits and Features

  • Can be added to or removed from CR9000X to support changing measurement needs
  • Very sensitive resolution: down to 1.6 microvolts
  • Channels become open circuits when the data logger is powered down so sensors are not loaded when not in use
  • CR9050EC disconnects sensors easily so CR9000X can be moved from location to location


Detailed Description

The CR9051E is an I/O module for the CR9000X-series and CR9000-series dataloggers. It contains 14 differential (28 single-ended) input channels for measuring voltages up to ±5 V, and an internal PRT that provides a reference temperature for thermocouple measurements. Each input channel is fault-protected to –40 V/+50 V. This fault protection prevents overvoltages on one channel from corrupting measurements on other channels. Another feature of the CR9051E is that its channels become open circuits when the data logger is powered down so sensors are not loaded.

The CR9051E includes one CR9050EC easy connector module. Easy connector modules allow sensor wiring to remain connected while the input module’s measurement electronics and the rest of the data logger system are used elsewhere. Additional CR9050ECs are purchased as a separate line item.

The CR9051E replaced the CR9050E in 2004. The CR90501E provides fault protection for a wider voltage range; fault protection for the CR9050E was limited to ±9 V. The channels of the retired CR9050E also did not become open circuits when the data logger powered down.


Analog Channels 28 single-ended, 14 differential
Analog Voltage Range ±5000 mV
Analog Voltage Accuracy ±(0.07% of reading + 4 A/D counts), -25° to +50°C
Measurement Resolution to 1.6 μV
Fault Protection Range -40 V to +50 V
Active Current Drain 25 mA
Operating Temperature Range
  • -25° to +50°C (standard)
  • -40° to +70°C (extended)
  • 24.1 x 2.5 x 16.3 cm (9.5 x 1.0 x 6.4 in.) for module and Easy Connector
  • 24.1 x 2.5 x 11.5 cm (9.5 x 1.0 x 4.5 in.) for module only
  • 479 g (16.9 oz) for module and Easy Connector
  • 287 g (10.1 oz) for module only
  • 192 g (6.7 oz) for Easy Connector only


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

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