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Multiply Capability
Provides excitation current for up to 4 model 229 soil-water sensors
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Datalogger Considerations

The CABLE3CBL can be used to connect the CE4 to the datalogger (see Ordering Info).

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR5000 CR7X CR9000X

Compatable Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000

Power Considerations

The CE4 requires 12 Vdc power. A datalogger control port is typically used to activate the module. When the control signal is received, all 4 channels output a 50 mA source current to the connected loads (typically 229 probes). When the control signal is dropped to 0 Vdc, output from the module ceases.

When active, the current required from the 12 V supply is approximately the following:

25 mA + (50 mA)(the number of 229 sensors connected to the CE4 outputs).


The CE4 can source current for four probes directly. In applications that require more sensors, the output(s) of the CE4 can be connected to as many as four AM16/32B multiplexers, greatly expanding system capacity.

When using multiplexers, the user should be aware that switching currents of greater than 30 mA will degrade the contact surfaces of the mechanical relays. This will adversely affect the suitability of these relays to multiplex low voltage signals. Although a relay used in this manner no longer qualifies for low voltage measurements, it continues to be useful for switching currents in excess of 30 mA. Therefore the user is advised to record which multiplexer channels are used to multiplex the 50 mA excitation for the 229-L probes in order to avoid using those channels for low voltage measurements in future applications.

Enclosure Considerations

The CE4 requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. The CE4's case has mounting flanges for attachment to the 1"-on-center hole grid of Campbell Scientific enclosures. Grommets and screws are provided to attach the flanges to the backplate of our enclosures.

Compatible Enclosures

ENC10/12 ENC10/12R ENC12/14 ENC14/16 ENC16/18

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