Check the listing for details. Campbell Scientific SDM-SW8A 8-channel switch closure input module - Warranty. Condition: Used. Listed at 199.00 USD. Campbell Scientific SDM-SW8A 8-channel switch closure input module - Warranty SDM-SW8A 8-channel switch closure input module - Great shape Warranty This sale is for a: SDM-SW8A 8-channel switch closure input module - Great shape Warranty Condition: Used, excellent shape. Warranty: 30 Day Warranty. We pledge to offer the best service and warranty to all of our customers! We are extending a 30 Day warranty on this item. This is our way of saying thank you for allowing us to serve you. Certification: This is an genuine product from this manufacturer. Web Information: 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 data logger enables individual modules through an addressing scheme; multiple SDMs (in any combination) can be connected to one data logger. We recommend a maximum of four SDM-SW8As be connected to a single data logger. After a module is enabled, it operates independently of the data logger until additional commands are received or results are transmitted. Specifications 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 65535 Internal Sampling Frequency 500 Hz Watchdog Reset Yes Operating Temperature Range -25° to +55°C Operating Voltage Range 9.6 to 16 V Typical Current Drain 3 mA quiescent 6 mA active (maximum) Relative Humidity 0 to 90% RH (non-condensing) Maximum Cable Length 6 m (20 ft) total to all SDM devices Consult Campbell Scientific if longer lengths are necessary. Dimensions 15.7 x 6.9 x 2.3 cm (6.2 x 2.7 x 0.9 in.) Weight 0.23 kg (0.5 lb)