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NI WSN-3212 Specifications

These specifications are typical for the range -40 to 70 °C unless otherwise

noted. Some specifications (such as sample interval and power consumption)

can be optimized by customizing node behavior with the LabVIEW Wireless

Sensor Network (WSN) Module Pioneer. See the LabVIEW WSN Benchmarking

document, found on NI Developer Zone, for more information.

Analog Input Characteristics

Number of channels.............................. Thermocouple input channels

ADC resolution...................................... 24 bits

Type of ADC........................................... delta-sigma

Voltage measurement range................. ±73 mV

Common-mode range

Channel-to-common ......................... ±700 mV

Common-mode rejection ratio (0 to 60 Hz)

Channel-to-common ......................... 95 dB

Temperature measurement ranges

Thermocouple types J, K,

R, S, T, N, and B ........................... Works over temperature ranges

defined by NIST

Thermocouple type E........................ -270 to 950 °C

Input bandwidth (-3 dB)......................... 1 Hz

Noise rejection...................................... 65 dB min at 50/60 Hz

Overvoltage protection.......................... ±30 V between any input and common

Differential input impedance................ 20 MΩ

Input current.......................................... 50 nA

Input noise............................................. 0.5 μV

rms

Gain error .............................................. 0.02% max at 25 °C,

0.03% typ at -40 to 70 °C,

0.1% max at -40 to 70 °C

Offset error (with autozero)................... 11 μV typ, 12.5 μV max

1

Minimum sample interval for WSN-3212 can be improved by customizing node behavior with the

LabVIEW Wireless Sensor Network (WSN) Module Pioneer. See the LabVIEW WSN Benchmarking

document, found on NI Developer Zone, for more information.

Digital I/O

Static Characteristics

Number of channels.............................. 4 bidirectional, individually settable

Modes (configurable per channel) ........ Drive High Only, Drive Low Only,

Drive High and Low, and Tristate

Voltage range

Input.................................................. 0 to 30 V

Output (sourcing) .............................. 5 to 30 V

Output current (sourcing or sinking)...... 500 mA max on any one channel,

500 mA total for all four channels

Power-on output state .......................... High impedance, tristate

DIO power supply voltage range........... 5 to 30 V

Digital input logic levels

Input high range................................ 1.65 to 30 V

Input low range................................. 0 to 0.45 V

Input current

0 V input............................................ -160 μA

5 V input............................................ 125 μA

30 V input.......................................... 220 μA

DIO output voltage drop

Sourcing............................................ 0.5 V at 0.1 A; 0.763 V at 0.5 A

Sinking.............................................. 0.057 V at 0.1 A; 0.286 V at 0.5 A

DIO overcurrent fuse

Maximum voltage............................. 30 V

Hold current...................................... 1.1 A at 25 °C

Trip time............................................ 2.5 s at 5 A at 25 °C

Dynamic Characteristics

Output delay time

Sinking, 10 kΩ pull up....................... 15 μs

Sourcing, 10 kΩ pull down ............... 3.5 ms

Power Requirements

Caution: Use the WSN-3212 with a 24 VDC, UL-listed, limited power source

(LPS) supply. The power supply bears the UL-listed mark, LPS. It must also meet

any safety and compliance requirements for the country of use. Do not use

rechargeable batteries.

The following power requirements specifications are typical at 25 °C.

Battery Power

Internal battery

Type................................................... 4 AA, alkaline only

Voltage range ................................... 3.6 to 7.5 V

60-second sample interval ............... 0.4 mW at 6 V

2-second sample interval ................. 7.4 mW at 6 V

60-second sample interval ............... Up to 3 years

2-second sample interval ................. Up to 2 months

External Power

Voltage range........................................ 9 to 30 V

Power input mating connector.............. 2-position MINI-COMBICON,

Phoenix Contact part number: 1714977

Wireless Sensor Network Programmable Analog Input Measurement Nodes