3 1/2 STRAIN/MICROVOLTMETER, TRANSMITTER & CONTROLLER
QUANTA Q2000S
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The QUANTA 2000S is a 3 1/2 digit meter/controller for use with pressure transducers and load cells which require bridge excitation and preamplification of microvolt signals. Deadload and tare adjustments make it suitable for weighing applications. Like process meters, it provides zero and span adjustments for direct readout in engineering units. It can also be used as a microvoltmeter with differential input. EXCITATION SUPPLY AND PREAMPLIFIER The Q2000S provides a constant-voltage excitation supply, which is adjustable from 1 to 10 V and can drive up to 30 mA. It also provides a high-impedance preamplifier, which is continuously adjustable so that signal levels from ±2.0 to ±500 mV can produce the full-scale display of ±1,999 counts. At 10 V excitation and maximum gain, full-scale readout can be obtained with strain-gauge sensitivity as low as 0.20 mV/V. An active filter is provided for noise reduction. BRIDGE CONNECTION Bridges can be connected by 4 or 6 wires. In 6-wire con-nection, two lines sense the voltage applied to the bridge and compensate for lead resistance (these two sense lines require the optional PCB connector D1). RESOLUTION AND ACCURACY Resolution is one part in ±1,999 counts, or 0.05% of full scale. Accuracy is 99.9% of reading. The measurement is ratiometric to reduce errors due to temperature and power- line variations. The same internal reference controls the meter gain and the excitation level. INPUT POWER AND DISPLAY OPTIONS Six types of meter power are available: 120 Vac, 240 Vac, 24 Vac, 5 Vdc, isolated 9-32 Vdc, and isolated 26-56 Vdc. An LED display is standard. An LCD display is available in the Q2000 and is ideal for viewing in bright ambient light. ANALOG OUTPUT OPTIONS A 1 mV/count (±2 V full-scale) analog output is standard and is ideal for driving a strip-chart recorder. An additional analog output can be provided by an optional vertical plug-in board. Available output signals are 0-5 Vdc, 0-10 Vdc, 0-1 mA (source or sink), and 4-20 mA (source or sink). The top and bottom of each output range can be scaled to fit a user-selected display span. CONTROL OUTPUT OPTIONS Additional outputs can be provided by a horizontal upper board. Available options include single-setpoint control with one 10 A relay, dual-setpoint control with two 10 A relays, 4-20 mA proportional control (source or sink), time-proportional 2 A solid-state relay control, and isolated, parallel BCD output. For additional information, please refer to the QUANTA, Options, and Mechanical sections. SPECIFICATIONS
Gain adjustment: Seven overlapping ranges with fine adjustment Input configuration: Differential, ratiometric Zero adjustment: ±225 µV/volt of excitation Span adjustment: 1 to 2.47 of preamp gain Bias current: 11 nA typ, 22 nA max NOISE REJECTION NMR, SIG HI to SIG LO: 95 dB, 50/60 Hz CMR, SIG GND to SIG LO: 80 dB, DC to 60 Hz CMV, SIG GND to SIG LO: ±1 V, DC to 60 Hz CMR, SIG GND to PWR GND: 120 dB CMV, SIG GND to PWR GND: 1500 Vp per HV test, 354 Vp per IEC spacing ACCURACY AT 25°C Error, max: ±0.05% of reading ±1 count Span tempco: ±0.01% of reading/°C Zero drift, max: ±0.3 µV/°C Offset drift, max: ±(0.01% offset V ±0.01% FS V)/°C Step response: 1 s to 99.9% of span Warmup to rated accuracy: 30 min CONVERSION Technique: Dual-slope, average-value Signal integration period: 100 ms Read rate: 2.5/s EXCITATION Configuration: Constant-voltage Voltage sense: Internal or remote Voltage range: Adjustable from 1 to 10 V Load current, max: 30 mA DISPLAY LED: 0.56 in (14.2 mm) 7-segment, red LCD: 0.50 in (12.7 mm) 7-segment liquid crystal Symbols: 1.8.8.8 Decimal point positions: Three positions selectable by jumpers behind lens or at connector Overrange indication: Three least-significant digits blanked POWER AC voltages: 120, 240 or 24 Vac +10%/15% AC frequency: 49-440 Hz DC voltages: 9-32 Vdc, isolated to 300 Vp; 26-56 Vdc, isolated to 300 Vp; 5 Vdc ±5%, non-isolated Power consumption: 5 W max ENVIRONMENTAL Operating temperature: 0 to 60°C Storage temperature: 40 to +85°C Relative humidity: 95% at 40°C (non-condensing) MECHANICAL Dimensions: Newport DIN1A (1/8 DIN) case (see Mechanical section for drawings) Weight: 17 oz (480 g) Case material: 94V-0 UL-rated polycarbonate 
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