NV6A

NV6a Filtering signal conditioner for sensor signal matching to a 4…20mA, 2-wire interface Features • • • • • • low noise and low drift 2-wire connection – power supplied by current loop loop current limitation integrated reverse polarity protection highly stable sensor supply voltage protection against reverse polarity of sensor connection • • • • • zero position and gain adjustable via potentiometers electronic components hermetically sealed optionally frequency programmable, active rd 3 order low pass filter optional high pass filter different connector options Description The NV6a amplifies, filters and normalizes the output signals of SEIKA sensors. The symmetrical output signal enables unproblematic subsequent signal processing on the basis of 4…20mA current loop technology. The NV6a does not require a separate supply voltage, as the internal operating voltage feeds off the current loop. The NV6a furthermore provides a highly stable 5V sensor supply voltage with short circuit current limitation. Multiple internal switching variants allow for optimal adaptation of signal processing parameters, such as settling time, filter cut-off frequencies and amplification and zero point adjustment, to the measuring task. Application The NV6a has its application anywhere a SEIKA sensor is, without much expenditure and under optimal compatibility, to be connected to measuring equipment operating on 4…20mA, 2-wire current loop basis and subsequent adjustment of amplification and zero position are necessary. Typical applications are the coupling with memory programmable control systems and the signal transmission over long distances with little transmission line setup. Technical Specifications Dimensions excluding connector Terminal voltage Minimum loop current excluding sensor Maximum loop current Operating temperature Internally generated sensor supply voltage Temperature drift of sensor supply voltage Maximum allowable sensor current Signal loop current range Zero current Compensation range of sensor offset voltage US_offset Amplification range with respect to a loop cursee dimension drawing +8…+30 Volt (reverse polarity protected to -70Volt) approx. 2mA approx. 24mA -40...+85°C +5,00 Volt 20 ppm/Kelvin approx. 1,5mA 4...20mA 12mA 2,3...2,7 Volt (larger ranges, e.g. for B1 in Z direction on request) US_offset±100mV, US_offset±300mV (on request) SEIKA Mikrosystemtechnik GmbH * Ellharter Str.10 * D-87435 Kempten * Tel: 0831-25532 Fax: 0831-25534 Tope Co., Ltd. Tel: (02) 8228-0658 Fax: (02) 8228-0659 httrp://www.sensor.com.tw e-mail: tope@ms1.hinet.net (7/2001) - NV 3 - NV6a rent of 12±8mA Maximum load resistance at 24V supply voltage Signal-to-noise ratio Signal-to-noise ratio with standard sensors Frequency range Electrical connections 500 Ω 30µVs.s. >65dB 0...10Hz, 0...200Hz, 0...1kHz, custom ranges on request pin connector 2,54mm, length 5,7mm, Ø 0,63mm gold-plated soldering pads optional Dimensions 50 10.22 5.5 25 33.02 6.185 2.54 2.54 2.54 1.12 Connections g ain regulator zero regulator s ignal current 4…20mA + 5.4 terminal voltage 8…30V + - Ua +5 Volt (max. 2mA) s ensor transmiss. line SENSOR GND (sensor ground) The terminal voltage is the supply vol tage for both the NV6a and the sensor! Attention! Sensor GND and NV6a GND (both at same potential) must be isolated from current loop! In a multiaxial arrangement (e.g. SW3), all sensor grounds must be isolated from each other. When ordering, look for “Sensor internally insulated, compatible with NV6a”! This restriction is not applicable to signal conditioners with voltage output (NV4a, NV8a, NG..U, etc.)! Since the supply voltages for the NV6a and the sensor feed off the current loop (they require at least 3mA), a terminal voltage of 8V to the NV6a must be guaranteed in order to ensure proper functionality even for the maximum loop current of approx. 24mA (highest voltage drop across load resistance). SEIKA Mikrosystemtechnik GmbH * Ellharter Str.10 * D-87435 Kempten * Tel: 0831-25532 Fax: 0831-25534 Tope Co., Ltd. Tel: (02) 8228-0658 Fax: (02) 8228-0659 httrp://www.sensor.com.tw e-mail: tope@ms1.hinet.net (7/2001) - NV 4 -