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6841

6841
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www.nokeval.com sales@nokeval.com 6841 Programmable transmitter for strain gauge sensors • • • • • • • • • • • Strain gauge sensors with 4- or 6-wire connection Excitation voltage 10 V to sensors, max 150 mA Red LED display on the front panel Settings via front panel keys Output 0/4..20 mA, 0..10 V Serial communication RS-485 2 alarm relays Taring via front panel keys or external switch Measuring accuracy < 0,05 % Power supply 12..32 VDC or 85..240 VAC Linearisation 6 points The versatile transmitter 6841 is designed for strain gauge sensors. Strain gauge sensors can be connected with 4 or 6 wires. The 6-wire connection is recommended for applications requiring very high accuracy. The transmitter provides 10 V excitation voltage for the sensors, max. four 350 ohm sensors. The transmitter 6841 includes output 0/4-20 mA/ 0-10 V, 2 alarms or serial output RS-485 as standard. Display scaling and taring is easy via front panel keys. Scaling can be carried out in two different ways, either by applying the mV/V values of the bridge or using the teaching function. The teaching is done by first loading the sensors with the min. weight and then with the max. weight, after which the transmitter will automatically calculate the scaling. Additional teaching points can be utilized to improve linearity. In applications where the sensor loading is not in balance a separate serial connection unit of the sensors, 20 SA-4, can be used to prevent the nonlinearity caused by the imbalance. There are two power supply alternatives: one for line voltage 85..240 VAC and the other for 12..32 VDC or 24 VAC, both galvanically isolated from input and outputs. Analog conversion is done by a 16-bit A/D-converter (resolution 1/64000) and the number of measurements is 3 per second. The display can be damped by a digital filter if necessary. The number of decimals on the display is selectable. Schematic Drawing of Transmitter 6841 Power supply: 85..240 VAC or 12..32 VDC/ 24 VAC Configuration, display scaling and taring via front panel keys Tare or hold Alarm 1 Serial output RS-485 Output

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Technical specification: Sensor Sensor connection Bridge connection Bridge supply Measuring range Sensitivity settings Accuracy Repeatability Temperature drift strain gauge, max. 4 x 350Ω parallel 4- or 6 -wire connection full bridge or half bridge 10 VDC, max 150 mA -40..+100 mV mV/V, freely selectable <0,05 % FS <0,02 % of span 0,003% /°C Display Display scaling Display taring Configuration Mounting Operating temp. Terminals Power supply Weight Output: Outputs Output range Accuracy Galvanic isolation Load resistance 4 digits, red LED, digit height 7 mm via front panel on the whole range...

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