WLS-TC

Specifications

Document Revision 1.0, February, 2010
© Copyright 2010, Measurement Computing Corporation

Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input
Table 1. Generic analog input specifications
Parameter

Conditions

Specification

A/D converters
Number of channels
Input isolation

Four dual 24-bit, Sigma-Delta type
8 differential
500 VDC minimum between field wiring andUSB interface
Thermocouple sensor type

Channel configuration
Differential input voltage
range
Absolute maximum input
voltage
Input impedance
Input leakage current

Thermocouple±0.080 V±C0x through ±C7x relative to GND(pins 9, 19, 28, 38)±25 V power on, ±40 V power off.

Normal mode rejection ratio
Common mode rejection ratio
Resolution
No missing codes
Input couplingWarm-up time
Open thermocouple detectfIN = 60 Hz
fIN = 50 Hz/60 Hz

CJC sensor accuracy

15 °C to 35 °C

Open thermocouple detect enabled

5 Gigohm, min.
105 nA max.
90 dB min.
100 dB min.
24 bits
24 bitsDC
30 minutes min.
Automatically enabled when the channel pair isconfigured for thermocouple sensors.
The maximum open detection time is
3 seconds.
±0.25 °C typ.
±0.5 °C max.
-1.0 to +0.5 °C max

0 °C to 70 °C

Channel configurations
Table 2. Channel configuration specifications
Sensor Category

Conditions

Specification

Thermocouple

J, K, S, R, B, E, T, or N

8 differential channels

Note 1:Channel configuration information is stored in the EEPROM of the isolated microcontroller by
the firmware whenever any item is modified. Modification is performed by commands issued
over USB or wireless from an external application, and the configuration is made non-volatilethrough the use of the EEPROM.

Note 2:

The factory default configuration is Type J.

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Specifications

Accuracy
Thermocouple measurement accuracy
Table 3. Thermocouple accuracy specifications, including CJC measurement error
Sensor TypeMaximum error

Typical error

Temperature range

J±1.499 °C±0.643 °C±1.761 °C±0.691 °C±2.491 °C±1.841 °C±2.653 °C±1.070 °C±1.779 °C±0.912 °C±1.471 °C±0.639 °C±1.717 °C±0.713 °C±1.969 °C±0.769 °C±0.507 °C±0.312 °C±0.538 °C±0.345 °C±0.648 °C±0.399 °C±0.650 °C±0.358 °C±0.581 °C±0.369 °C±0.462 °C±0.245 °C±0.514 °C±0.256 °C±0.502 °C±0.272 °C-210 to 0 °C
0 to 1200 °C-210 to 0 °C
0 to 1372 °C-50 to 250 °C
250 to 1768.1 °C-50 to 250 °C
250 to 1768.1 °C
250 to 700 °C
700 to 1820 °C-200 to 0 °C
0 to 1000 °C-200 to 0 °C
0 to 600 °C-200 to 0 °C
0 to 1300 °C

KSRBETN
Note 3:

Thermocouple specifications include linearization, cold-junction compensation and system noise.
These specs are for one year, or 3000 operating hours, whichever comes first and for operation ofthe device between 15 °C and 35 °C. For measurements outside this range, add ±0.5 degree to themaximum error shown. There are CJC sensors on each side of the module. The accuracy listed
above assumes the screw terminals are at the same temperature as the CJC sensor. Errors shown
do not include inherent thermocouple error. Please contact your thermocouple supplier for details
on the actual thermocouple error.

Note 4:

Thermocouples must be connected to the device such that they are floating with respect to GND(pins 9, 19, 28, 38). The device GND pins are isolated from earth ground, so connecting
thermocouple sensors to voltages referenced to earth ground is permissible as long as theisolation between the GND pins and earth ground is maintained.

Note 5:

When thermocouples are attached to conductive surfaces, the voltage differential between
multiple thermocouples must remain within ±1.4 V. For best results we recommend the use ofungrounded or insulated thermocouples when possible.

2WLS-TCSpecifications

Throughput rate to PC (USB or wireless)
Table 4. Throughput rate specifications
Number of input channels

Maximum throughput

12
34
5
6
7
8

2 Samples/second
2 S/s on each channel, 4 S/s total
2 S/s on each channel, 6 S/s total
2 S/s on each channel, 8 S/s total
2 S/s on each channel, 10 S/s total
2 S/s on each channel, 12 S/s total
2 S/s on each channel, 14 S/s total
2 S/s on each channel, 16 S/s total
Note 6:

The analog inputs are configured to run continuously. Each channel is sampled twice per second.
The maximum latency between when a sample is acquired and the temperature data is provided
by the device is approximately 0.5 seconds.

Digital input/output
Table 5. Digital input/output specifications
Digital type
Number of I/O
Configuration
Pull up/pull-down configuration
Digital I/O transfer rate
(software paced)
Input high voltage
Input low voltage
Output low voltage(IOL = 2.5 mA)
Output high voltage(IOH = -2.5 mA)
Note 7:CMOS
8 (DIO0 through DIO7)
Independently configured for input or output.
Power on reset is input mode unless bit is configured for alarm.
All pins pulled up to +5 V via 47 K kΩ resistors (default). Pull down to ground(GND) also available.
 Digital input – 50 port reads or single bit reads per second typ.
 Digital output – 100 port writes or single bit writes per second typ.
2.0 V min., 5.5 V absolute max.
0.8 V max., -0.5 V absolute min.
0.7 V max
3.8 V min.

All ground pins on the device (pins 9, 19, 28, 38) are isolated from earth ground. If a connection
is made to earth ground when using digital I/O and conductive thermocouples, the thermocouples
are no longer isolated. In this case, thermocouples must not be connected to any conductive
surfaces that may be referenced to earth ground.

3WLS-TC

Specifications

Temperature alarms
Table 6. Temperature alarm specifications
Number of alarms
Alarm functionality

Alarm input modes

Alarm output modes

Alarm update rate

8 (one per digital I/O line)Each alarm controls its associated digital I/O line as an alarm output. The input to each
alarm may be any of the analog temperature input channels. When an alarm is enabled, its
associated I/O line is set to output (after the device is reset) and driven to the appropriate
state determined by the alarm options and input temperature. The alarm configurations are
stored in non-volatile memory and are loaded at power on. Alarms will function both inwireless mode and while attached to USB.
 Alarm when input temperature > T1
 Alarm when input temperature > T1, reset alarm when input temperature goes below T2
 Alarm when input temperature < T1
 Alarm when input temperature < T1, reset alarm when input temperature goes above T2
 Alarm when input temperature is < T1 or > T2
Note: T1 and T2 may be independently set for each alarm.
 Disabled, digital I/O line may be used for normal operation
 Enabled, active high output (digital I/O line goes high when alarm conditions met) Enabled, active low output (digital I/O line goes low when alarm conditions met)
1 second

MemoryTable 7. Memory specifications
EEPROM

1,024 bytes isolated micro reserved for sensor configuration
256 bytes USB micro for external application use

Microcontroller
Table 8. Microcontroller specifications
TypeThree high performance 8-bit RISC microcontrollers

Wireless communications
Table 9. Wireless Communications specifications
Communication standard
Range
Transmit power output
Receiver sensitivity
RF channels
Addressing
Encryption

IEEE 802.15.4, ISM 2.4GHz frequency band, non-beacon, point-to-point
Indoor/urban: Up to 150' (50 m)
Outdoor RF line-of-sight: Up to 1/2 mile (750 m)
10 mW (10 dBm)
-100 dBm (1% packet error rate)
12 direct sequence channels available, channels 12 – 23 (2.410 – 2.465 GHz)
(software selectable)
16-bit PAN (personal area network) IDs per channel (software selectable)
64-bit device address
128-bit AES (software selectable)

Note 8:

Contains FCC ID: OUR-XBEEPRO. The enclosed device complies with Part 15 of the FCC
Rules. Operation is subject to the following two conditions: (i.) this device may not cause
harmful interference and (ii.) this device must accept any interference received, includinginterference that may cause undesired operation.

Note 9:Canada: Contains Model XBee Radio, IC: 4214A-XBEEPRO4WLS-TC

Specifications

Caution! To satisfy FCC RF exposure requirements for mobile transmitting devices, a separation distanceof 20 cm or more should be maintained between the antenna of this device and persons during
device operation. To ensure compliance, operations at closer than this distance is notrecommended. The antenna used for this transmitter must not be co-located in conjunction withany other antenna or transmitter.

USB +5V voltage
Table 10. USB +5V voltage specifications
Parameter

Conditions

Specification
4.75 V min. to 5.25 V max.

USB +5V (VBUS) input voltage
range

PowerTable 11. Power specifications
Parameter

Conditions

Specification

Connected to USB
Supply current
User +5V output voltage range(terminal block pin 21 and 47)
User +5V output current(terminal block pin 21 and pin 47)
Isolation

Connected to a self-powered hub. (Note 10)

500 mA max.
4.75 V min. to
5.25 V max.
10 mA max.

Measurement system to PC

500 VDC min.

Connected to a self-powered hub. (Note 10)

Wireless Communications operationSupply current

500 mA max.

AC Adapter power supply (used for remote wireless communications operation)
Standalone power supply

USB power adapter
2.5 Watt USB adapter withinterchangeable plugs(Includes plug for USA)5V ±5%
2.5 W
100 – 240 VAC
50 – 60 Hz
0.2 A

Output voltage
Output wattage
Input voltage
Input current

Note 10: Self-Powered Hub refers to a USB hub with an external power supply. Self-powered hubs allow

a connected USB device to draw up to 500 mA. This device may not be used with bus-poweredhubs due to the power supply requirements.
Root Port Hubs reside in the PC's USB Host Controller. The USB port(s) on your PC are rootport hubs. All externally powered root port hubs (desktop PC’s) provide up to 500 mA of current
for a USB device. Battery-powered root port hubs provide 100 mA or 500 mA, depending upon
the manufacturer. A laptop PC that is not connected to an external power adapter is an example
of a battery-powered root port hub.

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WLS-TC

Specifications

USB specifications
Table 12. USB specifications
USB device type
Device compatibility
USB cable type
USB cable lengthUSB 2.0 (full-speed)
USB 1.1, USB 2.0
Bus powered, 500 mA consumption max
A-B cable, UL type AWM 2725 or equivalent. (min 24 AWG VBUS/GND, min 28
AWG D+/D-)
3 meters max.

Environmental
Table 13. Environmental specifications
Operating temperature range
Storage temperature range
Humidity

0 to 70 ° C-40 to 85 ° C
0 to 90% non-condensing

Mechanical
Table 14. Mechanical specifications
Dimensions
User connection length

127 mm (L) x 88.9 mm (W) x 35.56 (H)
3 meters max.

LED / button configuration
Table 15. LED configuration
Command LED
Received Signal Strength Indicator(RSSI) LEDs

Wireless Power LEDTransmit LED
Receive LED
ButtonGreen LED – indicates a command was received by the device (either USB orwireless)Three green LED bar graph. The LEDs will turn on when receiving a wirelessmessage, and stay on for approximately 1 second after the end of the message.
These LEDs indicate the amount of fade margin present in an active wireless link.
Fade margin is defined as the difference between the incoming signal strength andthe device's receiver sensitivity.
 3 LEDs on: Very strong signal (> 30 dB fade margin) 2 LEDs on: Strong signal (> 20 dB fade margin) 1 LED on: Moderate signal (> 10 dB fade margin)
 0 LEDs on: Weak signal (< 10 dB fade margin)
Green LED - indicates that the internal RF module is powered.
Yellow LED - indicates transmitting data over the wireless link.
Red LED - indicates receiving data over the wireless link.
Firmware defined; this revision executes an LED test.

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WLS-TC

Specifications

CommandButton(firmwaredefined)

Transmit
Wireless Power

Receive

Received
SignalStrength

Screw terminal connector type and pin out
Table 16. Screw terminal connector specifications
Connector type
Wire gauge range

Screw terminal
16 AWG to 30 AWG
Table 17. Screw terminal pin out

Pin12345678910Signal NameRSVDNC
C0H
C0L
NC
RSVD
C1H
C1L
GND
RSVD

Pin Description
Reserved, Do Not Use

Pin
27
28
2930
3132
33
3435
36

CH0 sensor input (+)
CH0 sensor input (-)
Reserved, Do Not Use
CH1 sensor input (+)
CH1 sensor input (-)
Reserved, Do Not Use

CJC sensor
1112131415
1617181920
212223242526RSVD
NC
C2H
C2L
NC
RSVD
C3H
C3L
GND
RSVD+5V
GND
DIO0
DIO1
DIO2
DIO3Signal Name
RSVD
GND
C7L
C7H
RSVD
NC
C6L
C6H
NC
RSVD

Pin Description
Reserved, Do Not Use
CH7 sensor input (-)
CH7 sensor input (+)
Reserved, Do Not Use
CH6 sensor input (-)
CH6 sensor input (+)
Reserved, Do Not Use

CJC sensor
Reserved, Do Not Use

37383940414243
44
45
46
47
48
49
50
51
52

CH2 sensor input (+)
CH2 sensor input (-)
Reserved, Do Not Use
CH3 sensor input (+)
CH3 sensor input (-)
Reserved, Do Not Use+5V output
Digital Input/Output
Digital Input/Output
Digital Input/Output
Digital Input/Output

7RSVDGND
C5L
C5H
RSVDNC
C4L
C4HNC
RSVD+5VGND
DIO7
DIO6
DIO5
DIO4

Reserved, Do Not Use
CH5 sensor input (-)
CH5 sensor input (+)
Reserved, Do Not Use
CH4 sensor input (-)
CH4 sensor input (+)
Reserved, Do Not Use+5V output
Digital Input/Output
Digital Input/Output
Digital Input/Output
Digital Input/Output

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Fax: (508) 946-9500
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WLS-TC-spec.doc