di-8b35 linearized 4-wire rtd input modules features ? interfaces to 100 platinum rtds ? linearizes rtd signal ? high level voltage outputs ? 1500vrms transformer isolation ? ansi/ieee c37.90.1 transient pro - tection ? input protected to 240vac continu - ous ? 120db cmr ? 70db nmr at 60hz ? low drift with ambient temperature ? csa, fm and ce certifications pending ? mix and match module types description di-8b modules are an optimal solution for monitoring real-world process signals and providing high level signals to a data acquisition system. each di-8b35 module isolates, flters, amplifes, and linearizes a single channel of temperature input from an rtd and provides an analog voltage output. rtd excitation is provided from the module using a precision current source. excitation current does not fow in the input signal leads, which allows rtd mea - surements to be made independent of lead resistance. the exciation currents are small (0.25ma) which minimizes self-heating of the rtd. signal fltering is accomplished with a three-pole flter optimized for time and frequency response which provides 70db of normal-mode-rejection at 60hz. one pole of this flter is on the feld side of the isolation barrier for anti-aliasing, and the other two are on the system side. a special input circuit on the di-8b35 module provides protection against ac - cidental connection of power-line voltages up to 240vac. clamp circuits on the i/o and power terminals protect against harm - ful transients. the modules are designed for installation in class i, division 2 hazardous locations and have a high level of immunity to envi - ronmental noise. specifications typical at t a = +25oc and +5v power di-8b35 input range limits -200?c to +850?c (100 pt) input resistance normal power off overload 50m? 200k? 200k? input protection continuous1 transient 240vac ansi/ieee c37.90.1 sensor excitation current 0.25ma lead resistance effect 0.001?c/2 cmv, input to output 1500vrms max transient, input to output ansi/ieee c37.90.1 cmr (50hz or 60hz) 120db nmr 70db at 60hz accuracy3 di-8b35-01 di-8b35-02 DI-8B35-03 di-8b35-04 0.20?c 0.15?c 0.20?c 0.45?c stability output offset gain 20ppm/oc 50ppm/oc noise output, 100khz 250vrms bandwidth, -3db 3hz response time, 90% span 150ms output range 0 to +5v output protection transient continuous short to ground ansi/ieee c37.90.1 power supply voltage +5vdc 5% power supply current 30ma power supply sensitivity 25ppm/% mechanical dimensions 1.11" 1.65" 0.40" (28.1mm 41.9mm 10.2mm) environmental operating temperature storage temperature relative humidity -40oc to +85oc -40oc to +85oc 0 to 95% noncondensing 1240vac between + and - -/+exc/-exc terminals. 120vac between - and +exc/- exc terminals and between +exc and -exc terminals. 2 refers to the resistance in one lead. 3includes conformity, hysteresis and repeatability. dataq instruments, inc. ? 241 springside drive ? akron, ohio 44333 ? tel: 330-668-1444 ? email: support@dataq.co m ? www.dataq.co m
block diagram di-8b35 4-wire rtd input module ordering information model number input range accuracy* di-8b35-01 -100c to +100c (-148f to +212f) 0.20c di-8b35-02 0c to +100c (+32f to +212f) 0.15c DI-8B35-03 0c to +200c (+32f to +392f) 0.20c di-8b35-04 0c to +600c (+32f to +1112f) 0.45c *includes conformity, hysteresis, and repeatability. data acquisition product links (click on text to jump to page) data acquisitio n | data logge r | chart recorder | thermocoupl e | oscilloscop e the information on this data sheet is subject to change without notice. dataq and the dataq logo are registered trademarks of dataq instruments, inc. all rights reserved. copyright ? 2005 dataq instruments, inc. 241 springside drive akron, ohio 44333 330-668-1444
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