Pulse Input Adapters (S-UCA/B-M006) User's Guide
Contents
1. Onset products have been damaged by customer error or negligence or if there has been an unauthorized modification Tune up Service Onset will examine and retest this or any other smart sensor or input adapter A tune up fee may be charged 2003 Onset Computer Corporation All rights reserved Onset and HOBO are registered trademarks of Onset Computer Corporation Part MAN S UCA B Document 8129 A Page 4 of 42. mechanical contact closure output Typical Setup of S UCA M006 with a FET Switch Transducer The 120 Hz Pulse Input Adapter S UCA M006 is designed for devices with a normally open solid state switch FET switch or open collector with a maximum pulse frequency of 120 Hz This input adapter will not work with sensors that have mechanical switch outputs AC outputs or outputs that must be de bounced see above A typical setup of a FET switch transducer is shown below Pulse Input Adapter 3 3 Volts 100 K Ohms Transducer 1K Ohms Pulse Output Input Port Figure 2 120 Hz Pulse Input Adapter S UCA M006 connected to a device that has a FET switch output Note e The Pulse Input Adapters consume about 1 uA of current with the input high switch open and about 33 uA with the input low switch closed For maximum logger battery life use the Pulse Input Adapters with normally open switches or with transducers that have a duty cycle of 90 or higher Page 3 of 4 Pulse Input Adapters Connecting to the Logger To start using the Pulse Input Adapter stop the logger and insert the adapter s modular jack into an available sensor connection port on the logger If no port is available use a 1 to 2 sensor connection adapter Onset Part S ADAPT which allows you to plug two sensors into one port on the HOBO Weather Station only The HOBO Weather Station supports a maximum of 15 data channels and 1
3. white black Operating Temperature Range 40 to 75 C 40 to 167 F Overall Cable Length 6 5 m 21 ft Housing Weatherproof PVC housing protects input adapter electronics Housing Dimensions 14 x 0 95 cm 5 5 x 0 375 in Weight 310 g 11 oz Bits per Sample Number of Data Channels 12 1 Measurement Averaging Option No reports the number of pulses over the logging interval Length of Smart Sensor 50 cm 1 6 ft Network Cable Part Number S UCA M006 S UCB M006 A single HOBO Weather Station can accommodate 15 data channels and up to 100 m 328 ft of network cable the digital communications portion of the input adapter and smart sensor cables A single HOBO Micro Station can accommodate 4 data channels For maximum battery life the Pulse Input Adapters should be used with their preferred switch type The adapters will work with active high inputs S UCA and normally closed switches S UCB but battery life will not be optimized 2003 Onset Computer Corporation Part MAN S UCA B Doc 8129 A 900IN E VON S Hed Pulse Input Adapters Inside this package e Pulse Input Adapter e 2 wire nuts Connecting the Input Adapter Typical Setup The adapter housing should be installed outside the logger enclosure Be sure to follow the instructions included with the logger to ensure that the logger is properly sealed where the sensor cable exit
4. 5 sensor ports The HOBO Micro Station supports a maximum of 15 data channels and 4 sensor ports and cannot be expanded with the 1 to 2 adapters The logger automatically detects the new input adapter the next time you launch it Launch the logger and verify that the Pulse Input Adapter is functioning correctly See the HOBO Weather Station User s Guide for more details about connecting HOBO smart sensors to the HOBO Weather Station Verifying Functionality To verify proper operation of the Pulse Input Adapter connect the adapter to a logger and launch the logger With the logger launched enter a known number of pulses for example if using a tipping bucket rain gauge tip the bucket several times Then read out the logger and verify that the number of pulses in the data file is correct If you think that the Pulse Input Adapter is not capturing pulses check the connections to the adapter and verify that the device being measured is functioning normally If you believe the adapter is not working properly you can send the adapter back to Onset for repair Contact Onset or your Onset Authorized Dealer for a Return Merchandise Authorization RMA number Warranty This product is warranted to be free from defects in material and workmanship for a period of one year from the date of original purchase During the warranty period Onset will at its option either repair or replace products that prove to be defective This warranty is void if the
5. Pulse Input Adapters Part S UCA B M006 The Pulse Input Adapters are used to log the number of switch closures per interval and are designed to work with the HOBO Weather Station and Micro Station data loggers The adapter has a plug in modular connector that allows it to be added easily to the Weather Station or Micro Station Two versions are available for easy interfacing with either mechanical contact closures or solid state electronic switches The contact closure version is ideal for connecting to tipping bucket rain gauges Specification Pulse Input Adapter S UCA M006 for Electronic Switches S UCB M006 for Contact Closures Maximum Input Frequency 120 Hz 120 pulses per second 2 Hz 2 pulses per second Measurement Range 0 4093 pulses per logging interval Resolution 1 pulse Lockout time 45 us 10 327 ms 10 Recommended Input Type Preferred Switch State Electronic solid state switch closure or CMOS level digital output example FET opto FET or open collector Active low input Mechanical contact closure example reed switch in a tipping bucket rain gauge Normally open Edge Detection Falling edge Schmitt Trigger buffer logic levels low lt 0 6 V high 2 2 7 V Minimum Pulse Width ims Input Output Impedance 100 KO Open Circuit Input Voltage 3 3 V Maximum Input Voltage 3 6 V User Connection 24 AWG wires 2 leads
6. r s ground connection Typical Setup of S UCB M006 with a Tipping Bucket Rain Gauge or Mechanical Contact Switch The Contact Closure Pulse Input Adapter S UCB M006 is designed to work with Tipping Bucket Rain Gauges and other devices with normally open mechanical contact closure switched outputs with a maximum pulse frequency of 2 Hz This sensor has a pre set lockout time of 327 ms and is designed to work with signals that must be de bounced to be accurately measured Note e Bounce is a phenomenon where a single pulse may contain several false pulses or bounces De bouncing a signal is typically required when measuring signals from mechanical switches contact closures and reed switches The lockout time prevents bounce induced false pulses from being counted as separate switch closures If your gauge has a counter display and battery disconnect them and connect the Pulse Input Adapter in their place In most cases the black and white wires can be connected directly to the relay output When Page 2 of 4 Pulse Input Adapters connecting to relay or switch contacts polarity does not matter A typical setup for connecting a sensor with a mechanical switch output is shown below Pulse Input Adapter 3 3 Volts 100 K Ohms Sensor Ex Tipping Bucket Rain Gauge White 1K Ohms Normally Open Input Port Switch Figure 1 2 Hz Pulse Input Adapter S UCB M006 connected to a device that has a
7. s the logger enclosure Secure the adapter housing to the mast or sensor mounting arm Excess cable should be coiled and secured with cable ties When making a connection to a third party sensor take time to make sure that the connection is reliable The connection should be protected from rain dirt and direct exposure to the elements The input cable can be connected directly to screw terminals on the sensor or to sensor cables with the included wire nuts To use the wire nuts strip about cm 3 8 of insulation from the end of wires taking care not to nick the metal conductors Then twist the stripped wires together clockwise and then screw on the wire nut clockwise Check the connection by gently pulling on the wires to verify a solid mechanical connection Always strain relief the connection to make sure that the connection is not broken by being jerked or repeatedly worked back and forth Installation Considerations e Ifsensor cables are left on the ground use a conduit to protect against animals lawn mowers exposure to chemicals etc e Refer to the HOBO Weather Station User s Guide or the HOBO Micro Station User s Guide for information about setting up complete stations Input Connections The Pulse Input Adapter sensor has two input connections The white wire is powered at 3 3 V through a 100 KQ resistor This power is supplied from the logger s battery The black wire is connected through the adapter to the logge
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