Model DI-5B47T-07

Description

Each DI-5B47 thermocouple input module provides a single channel of thermocouple input which is filtered, isolated, amplified, linearized and converted to a high level analog voltage output (see block diagram). This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the requirement of external multiplexers.

The DI-5B modules are designed with a completely isolated computer side circuit which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin to I/O Common, pin 19. The DI-5B47 can interface to eight industry standard thermocouple types: J, K, T, E, R, S, N, and B. Its corresponding output signal operates over a 0 to +5V range. Each module is cold-junction compensated to correct for parasitic thermocouples formed by the thermocouple wire and screw terminals on the mounting hardware. Upscale open thermocouple detect is provided by an internal pull-up resistor. Downscale indication can be implemented by installing an external 47MΩ resistor, ±20% tolerance, between screw terminals 1 and 3.

Signal filtering is accomplished with a six-pole filter which provides 95dB of normal-mode-rejection at 60Hz and 90dB at 50Hz. Two poles of this filter are on the field side of the isolation barrier, and the other four are on the computer side.

After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.

A special circuit in the input stage of the module provides protection against accidental connection of power-line voltages up to 240VAC.

Accessories

Specifications

Input Range:	0ºC to +200ºC (+32ºF to +392ºF) -0.1V to +0.5V
Thermocouple Type:	T
Accuracy:	±0.25ºC (Includes conformity, hysteresis, and repeatability. Does not include CJC accuracy.)
Input Bias Current:	-25nA
Input Resistance:	Normal: 50MΩ Power Off: 40kΩ Overload: 40kΩ
Input Protection:	Continuous: 240Vrms max Transient: ANSI/IEEE C37.90.1-1989
CMV, Input to Output:	Continuous: 1500Vrms max Transient: ANSI/IEEE C37.90.1-1989
CMR (50Hz or 60Hz):	160dB
NMR:	95dB at 60Hz, 90dB at 50Hz
Stability:	Input Offset: ±1µV/°C* Output Offset: ±20µV/°C Gain: ±25ppm/°C
Noise:	Input, 0.1 to 10Hz: 0.2µVrms Output, 100kHz: 300µVp-p, 150µVrms
Bandwidth, -3dB:	4Hz
Response Time, 90% Span:	0.2s
Output Range:	0V to +5V
Output Resistance:	50Ω
Output Protection:	Continuous Short to Ground
Output Selection Time (to ±1mV of VOUT)	6µs at Cload = 0 to 2000pF
Output Current Limit:	±14mA max
Output Enable Control:	Max Logic “0”: +0.8V Min Logic “1”: +2.4V Max Logic “1”: +36V Input Current, “0”, “1”: 0.5µA
Open Input Response:	Upscale
Open Input Detection Time:	10s
Cold Junction Compensation:	Accuracy, 25°C: ±0.25°C Accuracy, +5°C to +45°C: ±0.5°C Accuracy, -40°C to +85°C: ±1.25°C
Power Supply Voltage:	+5VDC ±5%
Power Supply Current:	30mA
Power Supply Sensitivity:	±2µV/% RTI (RTI-Referenced to Input)
Environmental:	Operating Temperature: -40ºC to +85ºC Storage Temperature: -40ºC to +85ºC Relative Humidity: 0 to 95% Noncondensing RFI Susceptibility: ±0.5% Span Error at 400MHz, 5W, 3ft
Mechanical Dimensions:	2.28" × 2.26" × 0.60" (58mm × 57mm × 15mm)

*This is equivalent to °C as follows: Type J = 0.020°C/°C, Types K & T = 0.025°C/°C, Type E = 0.016°C/°C, Types R & S = 0.168°C/°C, Type N = 0.037°C/°C, Type C = 0.072°C/°C.

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