© 2003 Onset Computer Corporation
Part #: MAN-S-CIA
Doc #: 7583-A
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
®
Weather Station and Micro Station data loggers. The
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.
Specification 12-Bit
4-20 mA Input Adapter
Measurement Range*
4-20 mA
Accuracy
± 0.1 mA (± 0.5% full scale) over full temperature range of -40°C to 75°C
(-40°F to 167°F)
Resolution
± 4.93 µA
Input Impedance
124
Ω
Switched Input
Maximum switch voltage above ground (Pin 2 to Pin 1): 20 V
Maximum switch current: 50 mA
On time: 316.6 ms ± 3%
Sensor Trigger: Source
Voltage: 2.5 V ± 2.4%; maximum source current: 1 mA
On time: 316.6 ms ± 3%
Operating Temperature
Range
-40° to 75°C (-40° to 167°F)
Housing
Plastic case; must be placed inside logger enclosure to protect from direct
exposure to the weather
User Connection
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.)
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
Yes
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
* The input adapter can provide readings as low as 0 mA. This can be helpful when diagnosing sensor issues such
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.
Part # S
-CIA-
CM14
