The A6REL-12's internal relays are dual single-pole double-throw. Each of the six relays has a three position toggle switch; "on" and "off" for manual override, and "auto" for data logger control. In the on position, the common and normally open contacts are shorted. In the auto position, the state of a relay is controlled by a data logger control port.
A6REL-12's with serial numbers 1445 and higher are UL-approved.
|Function||Controls up to 12 external ac or dc devices.|
|Number of Channels||6|
|Operating Voltage||12 Vdc nominal (8.4 to 24 Vdc)|
|Current Drain at 12 Vdc||
|Toggle Switch||ON/OFF manual override; AUTO for data logger control|
|Relays||dual single pole double throw, break before make|
|Contact Material||Gold-clad silver|
|Coil Resistance||720 Ω ±10%|
|Release/Actuation Time||~3 ms|
|Operating Temperature||-40° to +70°C|
|Dimensions||22.4 x 13.9 x 4.1 cm (8.8 x 5.5 x 1.6 in.) including switches and mounts|
|Weight||635 g (1.4 lb)|
Expected Life (contact closures)
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
|CR500 (retired)||The CR500 has only one control port capable of providing a control signal.|
|CR510 (retired)||The CR510 has only one control port capable of providing a control signal.|
|CR800||The CR800 has only four control ports capable of providing a control signal.|
|CR850||The CR850 has only four control ports capable of providing a control signal.|
Each of the six relays is controlled by a data logger control port.
|Cable(s) Used||Number of Relays Controlled|
|One CABLE3CBL-L and
The A6REL-12 consumes 30 mA per active LED. The A6REL-12 may be powered by the data logger power supply (see manual for considerations with 21X) or a separate 8.4 to 24 Vdc battery. The A6REL-12 must be powered by a Class 2 device (Campbell Scientific power supplies conform to this requirement).
The A6REL-12 requires a non-condensing environment; a Campbell Scientific enclosure is recommended. A6REL-12's with serial numbers 1445 and higher include mounting flanges with keyhole slots that attach to the backplate of an enclosure. Grommets and screws are provided.
A6REL-12s with serial numbers 1444 and lower require the 6281 bracket kit for attachment to the backplate of Campbell enclosures.
Number of FAQs related to A6REL-12: 1
The following relay devices can be used with the CR800 and the CR850:
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.