Onset UCC Specifications

Pulse Input Adapters (Part #: S-UCC-M00x and S-UCD-M00x)

for use with HOBO® H21, H22, and U30 Series Data Loggers

The Pulse Input Adapters are used to log the number of switch closures per
interval and are designed to work with smart sensor-compatible HOBO data
loggers. The adapter has a plug-in modular connector that allows it to be added
easily to these loggers.

Two versions are available:

• Mechanical contact closure (S-UCD-M00x). Ideal for connecting

tipping-bucket rain gauges to HOBO H21 series loggers or U30 series
loggers.

• Solid-state electronic switches (S-UCC-M00x). Used for connecting

compatible pulse output sensors to HOBO H22 or U30 series loggers.

Inside this package

• Pulse Input Adapter

• 2 wire nuts

Specification Pulse Input Adapter

S-UCC-M00x

for Electronic Switches

Maximum Input Frequency 120 Hz (120 pulses per second) 2 Hz (2 pulses per second)
Measurement Range 0 – 65,533 pulses per logging interval
Resolution 1 pulse
Lockout time 45 µs ± 10% 327 ms ± 10%
Recommended Input Type

Preferred Switch State† Active low input Normally open
Edge Detection Falling edge, Schmitt Trigger buffer (logic levels: low ≤ 0.6 V, high ≥ 2.7 V)
Minimum Pulse Width 1 ms
Input/Output Impedance 100 KΩ
Open Circuit Input Voltage 3.3 V
Maximum Input Voltage 3.6 V
User Connection 24 AWG wires, 2 leads: white(+), black(-)
Operating Temperature Range -40° to 75°C (-40° to 167°F)
Overall Cable Length 6.5 m (21.3 ft.) or 1.57 m (5.1 ft.)
Length of Smart Sensor Cable 50cm (1.6 ft.)
Housing Weatherproof Xenoy housing protects input adapter electronics
Housing Dimensions 12.7 x 2.9 cm (5 x 1.13 in.)
Weight S-UCx-M001: 114 g (4 oz.); S-UCx-M006: 250 g (9 oz)
Bits per Sample 16
Number of Data Channels 1
Measurement Averaging Option No (reports the number of pulses over the logging interval)
Part Number S-UCC-M001 (1 m), S-UCC-M006 (6 m) S-UCD-M001 (1 m), S-UCD-M006 (6 m)

†

For maximum battery life, the Pulse Input Adapters should be used with their preferred switch type. The

Electronic solid state switch closure or
CMOS-level digital output (example: FET,
opto-FET or open collector)

The CE Marking identifies this product as complying with the relevant directives in the
European Union (EU).

Mechanical contact closure (example: reed
switch in a tipping-bucket rain gauge)

S-UCD-M00x

for Contact Closures

adapters will work with active high inputs (S-UCC) and normally closed switches (S-UCD), but battery life
will not be optimized.

© 2010–2013 Onset Computer Corporation. Onset and HOBO are registered trademarks of Onset Computer Corporation.
Other products and brand names may be trademarks or registered trademarks of their respective owners.

Part #: MAN-S-UCx
Doc #: 13577-D

Pulse Input Adapters

Input Connections

The Pulse Input Adapter sensor has two input connections. The white wire (+) is powered at 3.3 V through a 100 KΩ resistor.
This power is supplied from the logger’s battery. The black wire (-) is connected through the adapter to the logger’s ground
connection. The input cable can be connected directly to screw terminals on the sensor or to sensor cables with the included
wire nuts.

Connection using Wire Nuts

IMPORTANT: If using wire nuts, make sure the connection is protected from the elements.

1. Strip 1 cm (3/8") of insulation from the end of wires, taking care not to nick the metal conductors.

2. Twist the stripped wires together clockwise and then screw on the wire nut clockwise.

3. 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.

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. For expansion options, see the logger’s user manual.

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. Refer to the logger’s user guide for more details about connecting HOBO smart
sensors.

Mounting

To provide long-term protection from moisture entry, the smart sensor adapter must be mounted horizontally and with the
cable wires routed with drip loops so that water drains away from the cable entry point as shown in the example below. When
mounted properly, the housing is weatherproof (but not waterproof).

Smart sensor adapter
mounted horizontally

Drip loop

- 2 -

Drip loop