8-Channel Wireless Temperature Measurement Module


8-Channel Wireless Temperature Measurement Module | OM-WLS-TEMP

8-Channel Wireless Temperature Measurement Module

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  • 8 Temperature Input Channels
  • Supports Thermocouple Types J, K, T, E, R, S, B, N, RTD’s, Thermistors and Semi-Conductor Temperature Sensors
  • Built-In Cold Junction Compensation and Open Thermocouple Detection
  • Eight Digital I/O–User Configuration for Alarms
  • 802.15.4 Wireless Protocol
  • Range: Up to 46 m (150') Indoors and 732 m (2400') Outdoors
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The OM-WLS-TEMP is a wireless USB 2.0 full-speed temperature input module (fully compatible with both USB 1.1 and 2.0). The OM-WLS-TEMP provides 8 differential input channels that are software programmable for different sensor types including:

  • Thermocouple Types J, K, T, E, R, S, B, N
  • RTD–2, 3 or 4-wire Pt100 RTDs
  • Thermistors–2, 3 or 4-wire measurements
  • Semiconductor temperature sensors–LM36 or equivalent

The OM-WLS-TEMP provides a 24-bit analog-to-digital (A/D) converter for each pair of differential analog input channels. Each pair of differential inputs constitutes a channel pair. A different type of sensor (i.e., thermocouple, RTD, thermistor or semiconductor) can be connected to each channel pair, however both channels in the channel pair need to be the same sensor type (although if thermocouples are connected it is possible to mix thermocouple types).

The OM-WLS-TEMP provides two integrated cold junction compensation (CJC) sensors for thermocouple measurements and built-in current excitation sources for resistive sensor measurements, an open thermocouple detection feature allows detection of a broken thermocouple. An onboard microprocessor automatically linearizes the measurement data. The OM-WLS-TEMP features 8 independent temperature alarms. Each alarm controls an associated digital I/O channel as an alarm output. The input to each alarm is one of the temperature channel inputs. The output of each alarm is software configurable as active high or low. Temperature threshold conditions are software programmable to activate each alarm. When an alarm is activated, the associated digital I/O channel is driven to the output state. All configurable options are software programmable. The OM-WLS-TEMP is fully software-calibrated. The OM-WLS-TEMP can be operated as a standalone plug-and-play device which draws power through the USB cable.

The unit can also be operated as a remote device that communicates with the computer through the OM-WLS-IFC USB-to-wireless interface device. An external power supply is shipped with the device to provide power during remote operation. When operating as a remote device, the OM-WLS-TEMP communicates with the computer through the OM-WLS-IFC device connected to the computer’s USB port. Before the OM-WLS-TEMP can be operated remotely, it needs to be connected to the computer’s USB port and the network parameters configured to establish a wireless link with the interface device. Only devices with the same parameter settings can communicate with each other. All configurable options are software programmable using the included InstaCalTM utility software. LEDs on the OM-WLS-TEMP indicate the status of communications over the wireless link. An LED bar graph shows the fade margin of signals received by the OM-WLS-TEMP.

The OM-WLS-TEMP modules ship with an impressive array of software, including the new TracerDAQ®, a full-featured, out-of-the-box data logging, viewing, and analysis application. Driver support and detailed example programs are included for Universal Library programming libraries for Microsoft® Visual Studio® programming languages, and other languages, including DASYLab®, and ULx for NI LabVIEW® (comprehensive library of VIs and example programs compatible with 32-bit and 64-bit LabVIEW v8.5 through 2012) and InstaCalTM installation, calibration and test utility-powerful solutions for programmers and nonprogrammers alike. These modules operate under Microsoft Windows® XP (32-bit only) and VISTA/7/8 (32-bit and 64-bit) operating systems.

A/D Converter:
Four dual 24-bit sigma delta A/D converters
Input Isolation: 500 Vdc min between field wiring and USB interface
Number of Channels: 8 differential temperature inputs
Differential Input Voltage Range: Thermocouple, ±0.080V; RTD,
0 to 0.5V; thermistor, 0 to 2V; semiconductor sensor, 0 to 2.5V
Absolute Maximum Input Voltage: ±25V (power on), ±40V (power off)
Throughput Rate: 2 samples/sec max for all active channels
Input Impedance: 5 GΩ min
Input Leakage Current: 105 nA max (with open thermocouple detection enabled)
Normal Mode Rejection Ratio: 90 dB min
Common Mode Rejection Ratio: 100 dB min
Warm-Up Time: 30 minutes max
Thermocouple Input: Software programmable for type J, K, T, E, R, S, B, N
Open Thermocouple Detection: Automatically enabled when a channel
is configured for a thermocouple sensor
CJC Sensor Accuracy: ±0.25°C typical, ±0.5°C max (15 to 35°C);
-1.0 to 0.50°C max (0 to 70°C)
Pt100 RTD Input: 2-, 3- or 4-wire DIN 43760, α = 0.00385, SAMA, α = 0.003911,
ITS-90/IEC751, α = 0.0038505 (3- or 4-wire connections take up 2 differential channels)
Thermistor Input: 2-, 3- or 4-wire standard 2252 through 30,000 Ω
(3- or 4-wire connections take up 2 differential channels)
Semiconductor Sensor: TMP36 or equivalent

Digital I/O Channels: 8
Configuration: Each DIO bit can be independently configured for input or output.
Power on reset is input mode unless bit is configured for alarm
Pull-Up/Pull-Down Configuration: All pins pulled up to 5V via 47 Ω resistors (default).
Pull-down to ground (GND) also available
Digital I/O Transfer Rate
(Software Paced):

  Digital Input: 50 port reads or single bit reads per second (typical)
  Digital Output: 100 port writes or single bit writes per second (typical)
Input High Voltage: 2.0V min, 5.5V absolute max
Input Low Voltage: 0.8V min, -0.5V absolute min
Output High Voltage: 0.7V max (IOL = 2.5 mA)
Output Low Voltage: 3.8V min (IOH = -2.5 mA)
Temperature Alarms: 8 (one per digital I/O line)

IEEE 802.15.4, ISM 2.4 GHz
Range: Up to 150' (50 m) indoor/urban; up to 1/2 mile (750 m)
outdoor line-of-sight
Transmit Power: 10 mW (10 dBm)
Receiver Sensitivity: -100 dBm (1% packet error rate)
RF Channels: 12 direct sequence channels available, channels 12-23
(2.410-2.465 GHz), software selectable
Addressing: 16-bit PAN (personal area network) IDs per channel
(software selectable), 64-bit device address
Encryption: 128-bit AES (software selectable)

Microcontroller: Three highperformance 8-bit RISC microcontrollers
Power Supply Voltage (Supplied by USB Port): 4.75V min to 5.25V max
Power Supply Current (Supplied by USB Port): 500 mA max
User Output Voltage (5V)
4.75V min to 5.25V max, (connected to self-powered hub)
Wireless Communications Operation Supply Current:
500 mA max (ac adaptor required for remote wireless communications operation)
Excitation Current for Resistance Sensors:
RTD, 210 uA ±5% typ; thermistor, 10 uA ±5% typ
Isolation: 500 Vdc min measurement system to pc
USB Device Type: USB 2.0 (full-speed)
Device Compatibility: USB 1.1, USB 2.0
USB Cable Length: 3 m (10') max
Dimensions: 127 L x 89 W x 36 mm D (5.0 x 3.5 x 1.4")
Input Connections: Screw terminal blocks
(accept 16 to 30 AWG wire)
Operating Temperature: 0 to 50°C (32 to 122°F), 0 to 90% RH non-condensing
Storage Temperature: -40 to 85°C (-40 to 185°F)
Weight: 180 g (6.4 oz)
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