概览
The SW12V is a power switch that enables your data logger to determine whether 12 Vdc power is passed onto an external device.
优势与特点
- Allows an older data logger to supply power to an HMP45C or HMP155A temperature and RH sensor only during measurement, thereby reducing current drain
图像
技术说明
The SW12 provides similar functionality as a data logger's switched 12 V terminal. Therefore, this power switch is typically used with older data loggers (e.g., CR510, 21X, CR7) that do not have a switched 12 V terminal.
The SW12V consists of a cable that connects to the data logger, and a terminal block for connecting the external device.
The SW12V has a shrink wrap that lists the function of each wire by color. Wiring to the power source should be red to positive (12 V), black to ground, and green to control (on a Campbell Scientific data logger this is a control port labeled with a “C” or a universal port labeled with a "U."). Power out (to the device being powered) requires a 12 V connection and a ground connection.
Power is distributed to the remote device when the control wire is activated. Wire the power (+ lead) from the device being powered to a connection labeled “SW12V” on the SW12V green connector. Wire the ground (─ lead) to the G terminal on the SW12V green connector.
产品规格
| Function | Enables a data logger to determine whether 12 Vdc power is passed onto an external device. |
| Current Ratings |
|
| Control Line Voltage Range | 4 to 16 Vdc |
| Cable Length | 17.7 cm (18 in.) |
| Weight | 45.4 g (0.1 lb) |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR3000 (retired) | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) |
Additional Compatibility Information
Sensors
The SW12V is primarily used with the redesigned HMP45C relative humidity probe (effective May, 2004) and the HMP155A relative humidity probe.
常见问题解答
SW12V: 4
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-
The maximum voltage sourced through the SW12V is 16 Vdc.
-
Yes, this is possible. Keep in mind, however, that a common ground between related devices is essential for obtaining a good measurement.
-
The maximum current is dependent on temperature:
- 0.9 A @ 20° C
- 0.65 A @ 50° C
- 0.36 A @ 85° C
These limits are set by the polyfuse incorporated in the device.
-
The control line voltage range is 4 to 16 Vdc. A drive current of < 0.5 mA is required.