di 245 voltage thermocouple daq
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DI-245 Heat Flux Sensor Data Logger

DI-245 Heat Flux Sensor Datalogger. Features 4 analog input channels programmable as a thermocouple or voltage input, 16-bit measurement resolution, and a full scale range of ±10mV to ±50V for voltage measurements or Thermocouple types J, K, T, B, R, S, E, or N.

Model DI-245 is a low-cost data acquisition system that offers the performance of products many times its price. Four analog input chan-nels adapt to a wide range of measurement types and applications. Each channel can be programmed to make a thermocouple or voltage measurement. Programmed as a voltage channel you can select one of twelve measurement ranges supporting full scale values from ±10 mV to ±50 V. Programmed as a thermocouple channel you can select from eight thermocouple types: J,K,T,B,R,S,E,N.

Virtually any measurement will experience a difference in ground potential between the instrument, the signal source, and even between signal sources. Known as common mode voltages, these potential differences will cause noisy measurements in the best case or dam-age to the instrument in the worst case unless it’s specifically designed to tolerate them. Each analog input of the DI-245 is electrically isolated from other channels and from ground for safe and accurate measurements in the presence of common mode voltages. Channel isolation means that each analog input is free to float to an independent common mode voltage imposed upon it by the signal source, and still provide an accurate and noise-free measurement.

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SKU: Four differential channels for voltage or thermocouple measurments Categories: , Tags: , , ,

Description

Specifications

Analog Inputs
Number of Channels: 4
Configuration: Differential, Isolated
Programmable measurements per channel: Voltage, Thermocouple
Programmable thermocouple types and measurement range per channel:

Over 25 ±5 °C ambient temperature range.
Stable ambient temperature.
Following 30 minutes warm-up.
Excluding common mode error.
Excluding thermocouple error.
Thermocouple Type Temperature Measurement Range (°C) Accuracy (°C)
J -190 to 1200 ±(0.1% of span + 2)
K -180 to 1360 ±(0.1% of span + 2)
T -190 to 400 ±(0.1% of span + 1)
B 600 to 1000
1001 to 1810		 ±(0.2% of span + 4)
±(0.1% of span + 3)
R -40 to 300
301 to 1760		 ±(0.2% of span + 6)
±(0.1% of span + 3)
S -40 to 400
401 to 1750		 ±(0.2% of span + 6)
±(0.1% of span +3)
E -160 to 990 ±(0.1% of span + 1)
N -170 to 50
51 to 1290		 ±(0.1% of span + 3)
±(0.1% of span + 1)
Programmable voltage measurement ranges per channel: ±10 mV, ±25 mV, ±50 mV, ±100 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, ±10 V, ±25 V, ±50 V
Voltage measurement accuracy:
At 25 °C ambient temperature.
Following 30 minutes warm-up.
Excluding common mode error.		 ±(0.05% of range + 10 µV)
Input impedance: 1 MΩ, all ranges
Isolation: 350Vpp, Input-to-output, Channel-to-channel
Absolute maximum input without damage: 120 V rms
Maximum common mode voltage: 120 V rms
Min common mode rejection (330Ω unbalance): >100 dB (DC to 60 Hz)
Channel-to-channel crosstalk rejection: (Rsource ≤ 330 Ω; Freqsource ≤ 60 Hz) > 100 dB at any throughput
Digital Inputs
Number of channels: 2
Pull-up value: 4.7 KΩ
Isolation: None
Input high voltage threshold: 1.80 V minimum
Input low voltage threshold: 1.40 V maximum
Absolute max input without damage: ±30 V peak
Power
Power Consumption: 0.75 Watts (from USB port)
ADC Characteristics
Voltage Measurement Resolution:
Range Resolution
±10 mV 1.22 µV
±25 mV 3.05 µV
±50 mV 6.10 µV
±100 mV 12.20 µV
±250 mV 30.52 µV
±500 mV 61.04 µV
±1 V 122.07 µV
±2.5 V 305.18 µV
±5 V 610.35 µV
±10 V 1.22 mV
±25 V 3.05 mV
±50 V 6.10 mV
Thermocouple Temperature Measurement Resolution:
TC Type Resolution
J 0.086 °C
K 0.096 °C
T 0.037 °C
B 0.096 °C
R/S 0.111 °C
E 0.073 °C
N 0.092 °C
4-20 mA current loop resolution (5 VFS range with 250-Ω shunt resistor): 6553 ADC counts over the 4-20 mA range
Maximum sample throughput rate: Single enabled channel: 2,000 S/s
Two or more enabled channels: 200 S/s
Minimum sample throughput (hardware): 3.58423 S/s with a single enabled channel
0.358423 S/s with two or more enabled channels
Minimum sample throughput (using WinDaq): 0.709 samples per hour
Sample rate timing accuracy: 50 ppm
Indicators and Connections
Interface: USB 2.0 (mini-B style connector)
Indicator lights: 3 LEDs: Power, Active, Event
Input Connections: One 16-position terminal strips
Pushbutton: Manual event when used with WinDaq software
Environmental
Operating Temperature: 0 to 70 °C
Storage Temperature: -20 to 70 °C
Storage Humidity: 0 to 90% non-condensing
Physical Characteristics
Enclosure: Hardened Plastic
Mounting: Desktop; bulkhead
Dimensions: 2.625D × 5.5W × 1.53H in. (6.67D × 13.97W × 3.89H cm.)
Weight: 4 oz. (114 grams)
Software Support
WinDaq software: OS support
Programming: Instrument protocol, ActiveX Control

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