A21REL-12 4-Channel Relay Driver

Overview

With an A21REL-12, your Campbell Scientific datalogger 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 datalogger power supply or a separate 12 Vdc battery.

Specifications

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 Range -25° to +50°C
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
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR300
CR3000
CR310
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
CR850
CR9000 (retired)
CR9000X

Mounting Equipment

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

Additional Compatibility Information

Datalogger Considerations

Each of the four relays is controlled by a datalogger 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 datalogger 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 datalogger enclosure with double-sided tape or Velcro.

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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-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

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