A21REL-12
A21REL-12
End of life4-Channel Relay Driver
No longer available to order
This product is retained for service, documentation, and compatibility information.
- Model:
- A21REL-12
- Item Number:
- 2391
- Warranty:
- 1 year
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.
Technical 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)
Common Accessories
(3)CABLE3CBL
3-Conductor 22 AWG Cable with Drain
One CABLE3CBL-L can control one relay; two can control four relays. This 22 AWG, three-conductor cable has a Santoprene jacket and an aluminum Mylar shield. A 2-foot length should be sufficient if the datalogger and A21REL-12 will be housed in the same enclosure.
OrderableCABLE4CBL
4-Conductor 22 AWG Cable with Drain
One CABLE4CBL-L can control two relays. This 22 AWG, four-conductor cable has a Santoprene jacket and an aluminum Mylar shield. A 2-foot length should be sufficient if the datalogger and A21REL-12 will be housed in the same enclosure.
OrderableCABLE5CBL
5-Conductor 22 AWG Cable with Drain
One CABLE5CBL-L can control three relays. This 22 AWG, five-conductor cable has a Santoprene jacket and an aluminum Mylar shield. A 2-foot length should be sufficient if the datalogger and A21REL-12 will be housed in the same enclosure.
Orderable
Compatibility
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.
Compatible Products
(9)CR310
Measurement and Control Datalogger
OrderableNotes—ENC10/12
Weather-Resistant Enclosure, 10 x 12 inches
OrderableNotes—ENC10/12R
Raised Lid Enclosure, 10 x 12 inches
OrderableNotes—ENC12/14
Weather-Resistant Enclosure, 12 x 14 inches
OrderableNotes—ENC14/16
Weather-Resistant Enclosure, 14 x 16 inches
OrderableNotes—ENC16/18
Weather-Resistant Enclosure, 16 x 18 inches
OrderableNotes—ENC24/30
Painted Steel Enclosure, 24 x 30 inches
OrderableNotes—ENC24/30S
Stainless-Steel Enclosure, 24 x 30 inches
OrderableNotes—CR350
Measurement and Control Datalogger
OrderableNotes—
Related Resources
Case Studies
Documents
Services Available
- Repair
- No
- Free Support
- Yes