SDM-CD16AC

Name: SDM-CD16AC
Brand: Campbell Scientific
SKU: 8594
Availability: Discontinued

16-Channel AC/DC Relay Controller

SDM-CD16AC

Retired

16-Channel AC/DC Relay Controller

No longer available to order

This product is retained for service, documentation, and compatibility information.

Replaced by

SDM-CD16ACA
16-Channel AC/DC Relay Controller

Model:: SDM-CD16AC
Item Number:: 8594
Warranty:: 1 year

Overview

With an SDM-CD16AC, your Campbell Scientific data logger can automatically activate external ac or dc devices such as motors, pumps, heaters, valves, and fans. This ac/dc relay controller has 16 ports for connecting your ac or dc devices. Each port can be controlled automatically by the data logger’s program or controlled manually with an override toggle switch.

Key Advantages

Greatly Expands Control Capacity
Use multiple modules for up to 256 control ports

Technical Description

The SDM-CD16AC has a toggle switch that provides three positions: ON and OFF for manual override, and AUTO for data logger control.

In the ON position, the common (COM) and normally open (NO) contacts are closed.
In the OFF position, the normally open contact is open.
In the AUTO position, the state of the relay is controlled by the SDM command issued through the data logger’s control ports or SDM terminal.

SDM Operation

The SDM-CD16AC is a synchronously addressed data logger peripheral. Data logger control ports 1, 2, and 3 are used to address the SDM-CD16AC, then clock out the desired state of each of the 16 control ports. Up to 16 SDM-CD16ACs may be addressed, making it possible to control a maximum of 256 ports from the first three data logger control ports.

Benefits

Allows the data logger to automatically turn devices on or off when a threshold (for example, temperature or water depth) has been reached
Addresses up to 16 SDM-CD16ACs, allowing up to 256 ports to be controlled by one data logger
Includes LEDs that indicate when a port is active
Provides a manual override for each port
UL/CUL approved product

Specifications

Function: Allows a data logger to automatically activate external ac or dc devices such as motors, pumps, heaters, valves, and fans.
Number of Channels: 16
Operating Temperature: -40° to +55°C
Humidity: Non-condensing
Contact Operation: Single pole double throw
(break before make)
Contact Material: Gold-clad silver
Coil Voltage: 11 to 18 Vdc
Coil Resistance: 360 Ω ±10%
Expected Life (contact closures): Mechanical 10⁷
Actuation/Release Time: ~4 ms
Toggle Switch: ON/OFF manual override
AUTO for data logger control
Operating Voltage: 12 Vdc nominal
(11 to 18 Vdc)
Standards: Underwriters Laboratories (UL) listed product (E162021)
Dimensions: 24.6 x 5.1 x 8.6 cm
(9.7. x 2.0 x 3.4 in.)
Weight: 0.8 kg
(1.8 lb)

Individual Contact Ratings

Normally Open Rating: 5 A
(@ 30 Vdc)
5 A
(@ 125 Vac)
5 A
(@ 250 Vac)
Normally Closed Rating: 1 A
(@ 30 Vdc)
3 A
(@ 125 Vac)
2 A
(@ 250 Vac)

Current Drain @ 12 Vdc

Quiescent: 6 mA
Per Active LED: 45 mA
(switch on or auto active)

Accessories

(2)

Common Accessories

(2)

Replacement Parts

(3)

Ships With

(2)

Similar Products

(5)

Compatibility

Data Logger Considerations

Up to 16 SDMs can be connected to our data loggers. To communicate with connected SDM devices, the CR3000 and CR5000 use the SDM-C1, SDM-C2, and SDM-C3 ports. The other data loggers use ports labeled C1, C2, and C3. The 21X also requires channel 1H.

Programming

The SDMCD16AC Instruction controls SDM-CD16AC operation in CRBasic. Edlog Instruction 29 controls SDM-CD16AC operation in the CR7, and Edlog Instruction 104 controls SDM-CD16AC operation in the CR10(X), CR23X, and 21X data loggers.

Power Considerations

The data logger's rechargeable power supply, connected to our newer 1.2 A wall charger, is sufficient for powering the SDM-CD16AC. The SDM-CD16AC's LEDs consume 45 mA each when active. If all 16 LEDs are active at once, a current drain of over 720 mA should be expected. If more than one SDM-CD16AC will be used, a deep-discharge external battery may be necessary. This external battery should share a common grounding point with the data logger's ground.

Campbell Scientific does not recommended using the data logger’s alkaline batteries to power the SDM-CD16AC for long-term applications.

Enclosure Considerations

The SDM-CD16AC requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. Grommets and screws are provided to attach the flanges/bracket to the backplate of our enclosures.