MM4001 & MM4001iso rtd input transmitters description the MM4001 modules are used to provide an output voltage or current proportional to an rtd input signal. it is useful in measuring temperatures with a variety of rtd materials. the module utilizes a single constant- current source to excite the rtd and also has an accurate and stable leadwire compensation circuit for compensating 3-wire rtds against leadwire effects. the MM4001iso utilizes pulse width modulation to develop a pulse train with a duty cycle proportional to input signal amplitude. this pulse train is coupled through a pulse transformer where the duty cycle data is converted to a proportional dc level in the output circuit. options the following options are available on the MM4001 & MM4001iso: u all circuit boards conformal coated for protection against moisture. dc power inverter-isolated 12 v or 24 v dc power. controls two controls, zero and span, are accessible from the top of the module. calibration the MM4001 modules are shipped precalibrated, if there is a need to recalibrate, proceed as follows: refer to the instrument's label to determine your instrument's supply voltage and input and output ranges. refer to the "block diagram and pin connections" for pin connections. connect a precision decade resistance, potentiometer or rtd simulator to the input. to avoid errors due to the resistances of the connection wires, use a three-wire connection as shown in the ?block diagram and pin connections?. connect a precision dc voltage or current meter to the output. set the input resistance to the low end of the input range and adjust the zero control for the low-end output voltage or current. increase the input resistance to full scale and adjust the span control for the full-scale output. repeat until both readings are correct. case dimensions inches [mm] mounting the module is designed to plug into a standard 8 pin relay socket. (mp008) is a molded plastic socket that can be mounted on a flat surface or snapped into 2? inch wide pvc track (trk 48). a spring hold-down clip (clp1) is avail- able for installations where vibration may be a problem. a din-rail mounted socket (dmp008) is available for 35mm symmetrical rail. a killark hk series explosion-proof hous- ing with dome and 8-pin socket is available(hkb-hk2d-8). warranty the mighty module series of products carry a limited warranty of 10 + 5 years. in the event of a failure due to defective material or workmanship, during the 10 year period, the unit will be repaired or replaced at no charge. for a period of 5 years after the initial 10 year warranty, the unit will be repaired, if possible, for a cost of 10 % of the original purchase price. 1 2 http://
specifications rtd input 3-wire or 2-wire, 10 ohms to 2000 ohms input range select any range within rtd limit [min span 25f/14c (100f/55c with 10 ohms rtd)] excitation current 10 ohms 10 ma 100 ohms 5 ma 1000 ohms 0.5 ma 2000 ohms 0.2 ma output range voltage select any range from -10 v to +15 v, 10 ma max load (min span 0.2 v) current select any range from 0 to 50 ma max, >24 v compliance (1200 ohms max at 20 ma) 18 v compliance for iso option if fullscale output >20 ma open sensor output full scale accuracy 0.1% of span linearity (pt rtd, output vs temp) 0.5% of span, (temp 332f/0c) 0.15% of span, (temp <32f/0c) (others, output vs res) 0.01% of span temperature stability 0.04% of span per c common mode rejection 120 db,dc to 60 hz isolation (MM4001iso) output/input >500 megohms breakdown voltage >1000 vac rms output ripple (peak-to-peak) <0.1% of span breakdown, pwr/circuitry >1500 vac rms operating temperature 14f to 140f / -10c to 60c temperature stability 0.02% of span or 0.025c/c, whichever is greater power 115 vac 10%, 50 or 60 hz (2.5 w max) 230 vac 10%, 50 or 60 hz (2.5 w max) (dc power option) 24 vdc (limits 21 vdc to 32 vdc) (2.5 w max) isolation, dc power supply to input common: 10 megohms specifications are subject to change without notice. ? 2007 wilkerson instrument co., inc dwg#w102234b 3/07 3 4
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