Onset S-CIA-CM14 User Manual

12-Bit 4-20 mA Input Adapter (Part # S-CIA-CM14)

The 12-Bit 4-20 mA Input Adapter is used for sensors with
4-20 mA current loop outputs and is designed to work with the
HOBO
input adapter features both a battery-saving switched input and a
non-switched input. It also provides a trigger source voltage for
controlling power to external sensors. The input adapter has a
plug-in modular connector that allows it to be added easily to the
HOBO Weather Station or HOBO Micro Station.

* The input adapter can provide readings as low as 0 mA. This can be helpful when diagnosing sensor issues such

†

®

Weather Station and Micro Station data loggers. The

Specification 12-Bit 4-20 mA Input Adapter

Measurement Range* 4-20 mA
Accuracy

Resolution ± 4.93 µA
Input Impedance 124Ω
Switched Input Maximum switch voltage above ground (Pin 2 to Pin 1): 20 V

Sensor Trigger: Source Voltage: 2.5 V ± 2.4%; maximum source current: 1 mA

Operating Temperature
Range

Housing

User Connection

Dimensions 4.5 x 4.8 x 1.6 cm (1.8 x 1.9 x 0.6 in.)
Weight 25 g (0.88 oz)
Number of Data Channels† 1
Measurement Averaging

Option
Digital Filtering Automatic digital filtering with 32 readings/sample in 16.6 ms
Bits per Sample 12
Length of Network Cable† 14 cm (5.5 in.)
Part Number S-CIA-CM14

as open inputs.

The HOBO Weather Station and HOBO Micro Station have 10 and 4 data ports, respectively. A single HOBO

Weather Station or HOBO Micro Station can theoretically accommodate up to 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),
although available space in the enclosure may limit the number of sensors you can attach.

± 0.1 mA (± 0.5% full scale) over full temperature range of -40°C to 75°C
(-40°F to 167°F)

Maximum switch current: 50 mA
On time: 316.6 ms ± 3%

On time: 316.6 ms ± 3%

-40° to 75°C (-40° to 167°F)

Plastic case; must be placed inside logger enclosure to protect from direct
exposure to the weather

Six-position screw terminal strip (16 – 30AWG); shielded cable recommended with
outside diameter of 3.2 mm to 3.8 mm (0.125 in. to 0.150 in.)

Yes

Part # S-CIA-CM14

© 2003 Onset Computer Corporation
Part #: MAN-S-CIA
Doc #: 7583-A

12-Bit 4-20 mA Input Adapter

Inside this package

• 12-Bit 4-20 mA Input Adapter

• Hook-and-loop tape

• Three cable ties

Mounting

For the HOBO Weather Station, use the self-adhesive hook-and-loop tape included in the package to
mount the input adapter on top of the battery cover inside the logger enclosure. To mount more than one
adapter, use the back of the logger enclosure door.

For the HOBO Micro Station, you can place the input adapter inside the logger enclosure and allow it to
float freely. It is not necessary to use the hook-and-loop tape.

You can connect up to 10 adapters inside the HOBO Weather Station enclosure, or up to two adapters
inside the HOBO Micro Station, based on available space.

Mounting Considerations

• If sensor cables are left on the ground, use a conduit to protect against animals, lawn mowers,

exposure to chemicals, etc.

• Refer to the HOBO Weather Station User’s Guide or the HOBO Micro Station User’s Guide for

information about setting up complete stations.

Attaching Sensor Cables

For the HOBO Weather Station, bring the cable through the opening at the bottom of the logger
enclosure. Leave some slack in the cable inside the logger housing so that you can open and close the
logger’s door and change the batteries without straining the cable connection. Be sure to provide “drip
loops” underneath the logger to prevent water from trickling up the cable and into the logger. Pack the
opening with duct seal.

For the HOBO Micro Station, bring the cable through the logger’s sensor port. (See the HOBO Micro
Station User’s Guide for details on removing the dome nut and stuffing gland from the sensor port.)
Ensure that the cables to the sensor are the appropriate size for the stuffing gland (0.125”-0.15”). Be sure
to provide “drip loops” underneath the logger to prevent water from trickling up the cable and into the
logger.

Use the included cable tie to provide strain relief to the cable (or individual wires), as shown below.

Figure 1: Cable strain relief

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