Module 8 kênh đầu vào số Campbell Scientific SDM-SW8A

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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SDM-SW8A 8-Channel Switch Closure Input Module

Gọi 0904251826 để được trợ giúp

Module 8 kênh đầu vào số Campbell Scientific SDM-SW8A


The SDM-SW8A increases the number of switch closures or voltage pulses a datalogger can measure. Sensors that output a switch closure or voltage pulse signal include tipping bucket rain gages, flow meters, and anemometers.

Benefits and Features

  • Well suited for use in energy management studies

  • Provides eight individually configured channels

  • Measures a variety of signals: reed switches, dry contacts, or slow voltage pulses

  • Allows up to four SDM-SW8As to be connected to a single datalogger

Detailed Description

The SDM-SW8A provides eight channels for connecting the sensors. Each channel is individually configured for single-pole double-throw (SPDT), single-pole single-throw (SPST), or voltage pulse measurements. Output options include counts, duty cycle, and state.

SDM Operation

The datalogger enables individual modules through an addressing scheme; multiple SDMs (in any combination) can be connected to one datalogger. We recommend a maximum of four SDM-SW8As be connected to a single datalogger. After a module is enabled, it operates independently of the datalogger until additional commands are received or results are transmitted.


Measurement Types

Switch closure (SPDT, SPST), dc voltage pulse

Input Voltage Threshold

From below 0.9 to above 4.0 Vdc (±20 Vdc maximum)

Maximum Input Frequency

100 Hz (50% duty cycle)

Minimum Input Pulse Width

5 ms high, 5 ms low

Maximum Bounce Time

3 ms open without counting

Output Options

State, duty cycle, counts

Maximum Count/Port


Internal Sampling Frequency

500 Hz

Watchdog Reset


Operating Voltage

9.6 to 16 V

Typical Current Drain

  • 3 mA quiescent

  • 6 mA active (maximum)

Operating Temperature

-25° to +55°C

Relative Humidity

0 to 90% RH (non-condensing)


15.7 x 6.9 x 2.3 cm (6.2 x 2.7 x 0.9 in.)


0.23 kg (0.5 lb)



SDM-SW8A Switch Closure Module


SDM-SW8A 8-Channel Switch Closure Input Module

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