Instructions

UM-0085-B09 DT80 Range User Manual Page 385

CEM20 Specifications

Interfaces

• Power/Control inputs: 12Vdc, ground, serial data, serial clock (from logger or previous CEM20)

• Power/Control outputs: 12Vdc, ground, serial data, serial clock (to next CEM20)

• Analog output: (to logger channel corresponding to CEM20 address)

• 20 x 4-wire analog inputs

Connections

• Max total cable length between data logger and furthest CEM20: 100m

• Max supported CEM20 units per data logger:

DT80 (Series 2 or later): 5

DT85 (Series 2 or later): 16

DT81/ 82: none

Sampling

• Type: Relay multiplexer

• Maximum Input Voltage: 30Vdc

• Maximum Sampling Speed: 15Hz

• Internal RTD reference junction sensor for thermocouple measurements

System

• Status LED: Sample activity

• Address Selection: 4-way DIP switch. Address 1-15

Power Supply

• Recommended: Logger’s switched 12V output

• Alternative: External regulated 12Vdc ± 5%

Power Consumption

• Sampling: 0.36W (12V 30mA)

• Idle: 0.01W (12V 1mA)

Note: In most cases idle power consumption will be zero because the DT80's 12V output will be turned off when not sampling

Physical and Environment

• Construction: Powder coated steel and anodized aluminium

• Dimensions: 180 x 100 x 50mm

• Weight: 0.55kg

• Temperature Range: -40°C to 70°C

• Humidity: 85% RH, non-condensing

Accessories Included

• Analog and power/control cables for connection to the DT80