The SDM-CD16AC allows a Campbell Scientific datalogger to automatically activate external ac or dc devices such as motors, pumps, heaters, valves, and fans.
Read MoreThe SDM-CD16AC has a toggle switch that provides three positions: ON and OFF for manual override, and AUTO for data logger control.
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.
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 | -25° to +50°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 |
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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 |
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For DC Devices |
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For AC Devices |
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Current Drain @ 12 Vdc |
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Quiescent | 6 mA |
Per Active LED | 45 mA (switch on or auto active) |
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Product | Compatible | Note |
---|---|---|
CR1000 (retired) | ||
CR1000X | ||
CR200X (retired) | ||
CR216X (retired) | ||
CR300 | ||
CR3000 | ||
CR310 | ||
CR5000 (retired) | ||
CR6 | ||
CR800 | ||
CR850 | ||
CR9000X (retired) | Although the CR9000X is compatible, the SDM-CD16AC does not support its fastest communication rates and therefore is not practical for most of its applications. |
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.
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.
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.
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.
Number of FAQs related to SDM-CD16AC: 4
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No. The SDM-CD8S was designed to switch dc loads (12 Vdc nominal; 1 A maximum per channel, total current on all channels not to exceed 6 A). The SDM-CD8S switches the - outputs, rather than the + output. This is called a low-side switch. The + output is the same voltage as the PWR used to power the SDM-CD8S to ground.
To switch an ac load, consider using an SDM-CD16AC.
No. The SDM-CD16S was designed to switch dc loads (7 to 48 Vdc; 2 A maximum per channel). The load power is isolated from the logic power (12 Vdc).
To switch an ac load, consider using an SDM-CD16AC.
Yes. Up to 15 SDM devices can be attached to a data logger because they are addressable with a hex number of 0 to F. Some of those devices may require more power, which would need to be considered when adding devices.
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.