LR4 4-Channel Latching-Relay Module

Overview

The LR4 relay module is useful in situations where the power is unreliable or where power needs to be conserved, because it does not need electricity to keep the relay closed. The state of the relay can only be changed by sending a command to the LR4 or by manually toggling the relay button.   

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Images


Specifications

Supply Voltage 9 to 30 Vdc
Operating Temperature Range -40° to +60°C
Relay Type Latching
Maximum Voltage Ratings of Relays 30 Vdc/30 Vac
Dimensions 17.0 x 3.7 x 6.1 cm (6.7 x 1.5 x 2.4 in.)
Weight 0.48 kg (1.05 lb)

Power Consumption

Quiescent < 2.0 mA
Peak < 250 mA

Communications

Hardware SDI-12, RS-232, RS-485
Protocol SDI-12 Version 1.3, or ModBus via RS-232/RS-485 at 19,200 bps

Digital I/O Input Voltage

Maximum +20 Vdc
Minimum -12 Vdc

Relay Contacts

Relay #1, Relay #2 Two independent; single pole single throw (SPST)
Relay #3, Relay #4 Two independent; single pole double throw (SPDT)

Maximum Current

Relay #1, Relay #2 Not to exceed 100 VA or 5 A
Relay #3, Relay #4 Not to exceed 60 VA or 2 A

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Data Loggers

Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR23X (retired)
CR295X (retired)
CR300
CR3000
CR310
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6
CR800
CR850
CR9000 (retired)
CR9000X (retired)

Downloads

LR4 OS v.1.3 (46 KB) 13-08-2014

Current LR4 firmware. Read the manual for the update procedure.

View Revision History

Articles and Press Releases

FAQs for

Number of FAQs related to LR4: 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.