Campbell Scientific A6REL-12 Relay Driver - Manual (Page 7)

A6REL-12 Relay Driver
2. Specifications
Operating voltage: 12 VDC nominal (8.4 to 24)
Current drain at 12 VDC: 6 μa quiescent; 30 mA per active LED
(switch ON or AUTO active).
Toggle Switch: ON/OFF manual override; AUTO for
datalogger control.
Underwriters Laboratories (UL) and Canadian Underwriters Laboratories
(CUL) listed product. UL and CUL listing number is 5Z21.
RELAY SPECIFICATIONS
Arrangement: Dual single pole double throw Break
before make
Contact material: Gold-clad silver
Individual contact rating: 2A at 30 VDC
0.6A at 125 VAC
Coil voltage: 8.4 to 24 VDC
Coil resistance: 720 Ohms ±10%
Expected life (contact closures):
Mechanical
10 8
Electrical 2A at 30 VDC 5x10 5
1A at 30 VDC 2x10 6
Actuation/release time: Approx. 3 ms
Operating temperature: -40 ° to 70°C
The A6REL-12 protects each contact against voltage surges of
180 VDC (130 V rms) or greater with a power content of 8
Watts maximum and maximum duration of 0.1 ms. NOTE
3. Powering the A6REL-12
The A6REL-12 may be powered by the datalogger power supply or a separate
8.4 to 24 VDC battery.
If the 21X power supply is used to power the A6REL-12, all low level analog
measurements (thermocouples, pyranometers, thermopiles, etc.) must be made
differentially. This is a result of slight ground potentials created along the 21X
analog terminal strip when the 12 volt supply is used to power peripherals.
This limitation reduces the number of available analog channels and may
require the use of a separate battery to power the A6REL-12.
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