HS-SG 4-20 ma Current Transmitter for Strain Gauge & Potentiometer Input

Transcription

1 HS-SG 4-20 ma Current Transmitter for Strain Gauge & Potentiometer Input Ideal for load & pressure. DIN Rail mounted, digitally programmable. Scalable for strain gauge and potentiometer follower signals. Standard Features 200 mv, 2V, 20V, 200V & 300V input ranges. All ranges factory calibrated. Digital span adjust from 0 to ±99,999 internal counts. Digital zero adjust from -99,999 to +99,999 internal counts. 10V, 120 ma excitation output to power four 350 ohm load cells in parallel, isolated ma, 0-20 ma or 0-10V transmitter output, jumper selectable, isolated. Output resolution: % of span (16 bits). Output accuracy: ±0.02% of span. Output update rate to 60/sec Switching supply for Vac ±10% Easy setup with PC-based Instrument Setup Software. DIN rail mount housing only 22.5 mm wide. Detachable screw-clamp connectors. 5V, 10V or 24V dc transducer excitation output, isolated. Dual solid state relays for alarm or control, isolated. RS232 or RS485 serial communications, isolated. Universal AC power, Vac ±10%

2 Options: Extended main board for custom curve linearization & rate from successive readings. Description The Laureate HS-SG 4-20 ma output strain gauge transmitter is ideal for use with strain gauges, load cells, bridge networks and potentiometer follower circuits whose output requires zero and span adjustment. An isolated 120 ma, 10V transducer excitation supply is built in and can power up to four 350 ohm load cells in parallel. The two most sensitive voltage ranges, 200 mv and 2V, provide a high input impedance of 1 Gohm to minimize the load on the voltage signal. Strain gauges with a 20 mv output can be internally scaled to display up to 10,000 internal counts, while outputs of 200 mv can be scaled to 99,999 internal counts. For ten times higher sensitivity, use Laureate 4-20 ma load cell transmitters, which allow a 20 mv output to be scaled to the full 99,999 counts. Fast read rate at up to 50 or 60 conversions per second while integrating the signal over a full power line cycle is provided by Concurrent Slope (Pat 5,262,780) analog-to-digital conversion. High read rate is ideal for peak or valley capture and for real-time computer interface and control. Digital signal filtering modes are selectable for stable readings in electrically noisy environments. The internal digital readings and analog output can be separately selected to be either unfiltered or filtered. An unfiltered selection updates after each conversion for fastest response, up to 60/sec, while integrating the input signal over a full power cycle. Fast read rate provides true peak and valley readings and aids in control applications. A batch average filter selection averages each 16 conversions for an update every 1/4 sec. An adaptive moving average filter selection provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, the filter adapts by briefly switching to the shortest time to follow the change, then reverts back to its selected time constant. Another choice is Auto, which provides an automatic time constant selection based on the signal noise characteristics. Three analog transmitter settings are jumper selectable: 4-20 ma, 0-20 ma or 0-10V. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy. The output tracks the reading from -99,999 to +99,999 counts that would be transmitted digitally. For DC signals, this reading has a rated accuracy of ±0.01% of full scale input and can be scaled in software. Output isolation from signal and power grounds eliminates potential ground loop problems. The supply can drive 20 ma into a 500 ohm (or lower) load for 10V compliance, or 10V into a 5K ohm (or higher) load for 2 ma compliance.

3 Standard features of Model HS-SG include: Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 ma, 0-20 ma or 0-10V levels. Serial communications, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or Laurel ASCII protocol. Dual solid state relays for control or alarm, isolated. Rated 120 ma at 130 Vac or 170 Vdc. Transducer excitation output, isolated. User selectable ma, ma or ma. Universal AC power supply for Vac ±10%. Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-pc interface cable is available from Laurel (P/N CBL04). Low voltage power Vdc or Vac. Specifications HS-SG 4-20 ma Transmitter for Strain Gauge & Potentiometer Input Analog Input Range Input Ohms Voltage Current Input Resolution Input Accuracy Update Rate, Max Max Applied Voltage Current Protection Analog Output (standard) Output Levels Compliance, 4-20 ma Compliance, 0-10V Output Resolution Output Accuracy Output Isolation mv V V V V ma ma ma A 16 bits (65,536 steps) ±0.01% of full scale ± 2 counts 50/sec at 50 Hz, 60/sec at 60 Hz 600 Vac for 20, 200 & 600 V ranges, 125 Vac other ranges 25x for 2 ma, 8x for 20 ma, 2.5x for 200 ma, 1x for 5A 4-20 ma, 0-20 ma, 0-10 Vdc (jumper selectable) 10V ( ohm load ) 2 ma ( 5 kohm load or higher) 16 bit DAC ±0.02% of output span plus conversion accuracy 250V rms working, 2.3 kv rms per 1 minute test 1 Gohm 1 Gohm 100 ohms 10 ohms 1 ohm 0.01 ohm

4 Transducer Excitation Output (standard) Output levels Output isolation Dual Relay Output (standard) Relay Type Load rating Serial Communications (standard) Signal Types Data Rates Output Isolation Serial Protocols Modbus Modes Modbus Compliance Digital Addressing Power Input Standard power Low power option Power frequency Power Isolation Mechanical Case Dimensions Case Mounting Electrical Connections Environmental Operating Temp. Storage Temp. Relative Humidity ma, ma, ma (jumper selectable) 50V from signal ground Two solid state relays, SPST, normally open, Form A 120 ma at 130 Vac or 170 Vdc, 28 ohms in series RS232 (default) or RS485 (half or full duplex) 300, 600, 1200, 2400, 4800, 9600, baud 250V rms working, 2.3 kv rms per 1 min test Modbus RTU, Modbus ASCII, Laurel ASCII RTU or ASCII Modbus over Serial Line Specification V1.0 (2002) 247 Modbus addresses. Up to 32 devices on an RS485 line w/o a repeater Vac ±10% or Vdc (DC operation not UL approved) Vdc or Vac DC or Hz 250V rms working, 2.3 kv rms per 1 min test 120 x 101 x 22.5 mm 35 mm rail per DIN EN Detachable screw-clamp plugs 0 C to 70 C -40 C to 85 C 95% at 40 C, non-condensing

5 Pinouts HS-SG 4-20 ma Transmitter for Strain Gauge & Potentiometer Input Potentiometer Follower Application In potentiometric (or potentiometer follower) applications, the signal from a sliding contact voltage divider can be converted to engineering units such as position, level or percentage. By operating in a ratiometric mode, the transmitter will remove any effects caused by variations in the excitation supply. For use with a 1 kohm potentiometer, the recommended applied excitation voltage is 10V. A 2 kohm resistor should be placed in series with the excitation output and excitation return leads. This will allow the transmitter's 2V scale with a high input impedance of 1 Gohm to be used.