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A21REL-12 4-Channel Relay Driver
Services Available
Repair No
Free Support Yes

Overview

With an A21REL-12, your Campbell Scientific data logger can control up to four external ac or dc devices. This relay driver has four internal relays.

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Detailed Description

The A21REL-12's internal relays are single-pole double-throw. This relay driver may be powered by the data logger power supply or a separate 12 Vdc battery.

Specifications

Function Allows a data logger to control up to four external ac or dc devices.
Number of Channels 4
Contact Ratings
  • 1 A (at 20 Vdc)
  • 0.3 A (at 120 Vac)
Coil Current 13 mA/relay
Relays dual single-pole, double-throw relays
Operating Temperature -25° to +50°C
Operating Voltage 12 Vdc
Dimensions 14.0 x 6.9 x 3.0 cm (5.5 x 2.7 x 1.2 in.)
Weight 227 g (8 oz)

Compatibility

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)
CR300
CR3000 (retired)
CR310
CR350
CR500 (retired) The CR500 has only one control port capable of providing a control signal.
CR5000 (retired)
CR510 (retired) The CR510 has only one control port capable of providing a control signal.
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

Mounting Equipment

Product Compatible Note
ENC10/12
ENC10/12R
ENC12/14
ENC14/16
ENC16/18
ENC24/30
ENC24/30S

Additional Compatibility Information

Data Logger Considerations

Each of the four relays is controlled by a data logger control port.

Cables

Cable(s) Used Number of Relays Controlled
One CABLE3CBL-L 1
One CABLE4CBL-L 2
One CABLE5CBL-L 3
Two CABLE3CBL-L 4

Power Considerations

The A21REL-12 may be powered by the data logger power supply or a separate 12 Vdc battery.

Enclosure Considerations

The A21REL-12 requires a non-condensing environment. No mounting bracket is available. The peripheral is typically mounted in the data logger enclosure with double-sided tape or Velcro.


Frequently Asked Questions

Number of FAQs related to A21REL-12: 1

  1. The following relay devices can be used with the CR800 and the CR850:

    • 7321
    • A6REL-12*
    • A21REL-12
    • LR4
    • SDM-CD8S
    • SDM-CD16AC
    • SDM-CD16ACA
    • SDM-CD16S

    The CR800 and the CR850 can also be used with a wide variety of third-party relay devices.

    *Because the CR800 and the CR850 only have four digital ports, they do not have the ability to switch all six of the relays on the A6REL-12.

Case Studies

Utah Energy Industry: Air Quality and Met Monitoring
The past few years have seen a scramble within the power industry to use more......read more

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