HST Series

HART®Smart Isolated 2-Wire Transmitter
Conax  HST Series HART®Smart Isolated 2-Wire Transmitter
  • Inputs TC – Types E, J, K, T, R, S, N, B, C. RTD – 2, 3, and 4-wire Pt-100, (DIN & NIST curves) Pt-200, Ni-100, Cu-10 and other RTDs.DC mV ±120.00mV input SPAN.
  • Potentiometers – 100Ω to 20KΩ
  • Resistance – 2, 3, and 4-wire 0 to 600Ω
  • Optional: DCmA, DCV.
  • Optional: AC-Volts, AC-Amps, Frequency/Pulse.
  • Minimum Range None. Limited only by signal quality.
  • Digital Resolution >17 bits
  • Outputs 4-20mA isolated analog current loop, or Digital communication,
  • HART® protocol. Supply 12-45 VDC (@ no load). Reverse polarity protected.
  • Display (optional) 8×1 Character LCD indicator for programming and display of input and output parameters and status.
  • Operating Conditions -20ºC to +70ºC. 0-95% RH, non-condensing
  • Storage Temperature -55ºC to +125ºC
  • Turn-On Time Within 4 seconds to rated response
  • Response Time 0.5 seconds to 99% of reading (2 updates per second).
  • Damping Factor Programmable 0.0 to 32.0 seconds
  • Long Term Stability Better than ±0.1% of SPAN for 6 months
  • Isolation 800 VDC or peak AC
  • RFI/EMI Immunity Tested per SAMA PMC 33.1C from 20 to 1000 MHz and for field strength up to 30 V/m.
  • C.M.R.R. >120db DC to 60 Hz
  • Enclosure Extruded, anodized aluminum
  • Dimensions 3.00″ x 2.44″ x 2.46″
  • 3.00″ x 2.44″ x 3.00″ (with programmer/display)
  • (Hockey-puck housing. Suitable for mounting inside
  • 3.5″ diameter explosion-proof enclosures.
Performance Specifications
  • Analog Output Resolution 0.025% of SPAN (±4µA)
  • Analog Output (D/A) Linearity ±0.025% of SPAN
  • Digital Sensor Linearization <±0.02ºC for Pt-100 RTD
  • <±0.1ºC for thermocouples
  • Cold Junction Compensation Automatically corrected to within <±0.3ºC for all T/C types
  • Temperature Stability Zero: <±0.003%/ºC of SPAN
  • Span: <±0.005%/ºC of SPAN
  • Supply Voltage Effect: <±0.001% per volt
  • Calibration Automatic. Unit includes all of the calibration parameters. It performs periodic “ZERO”, “SPAN”, self-test, and auto calibration. No field calibration is required.
Product Description:
The Conax Model HST HART® Smart Isolated 2-Wire Transmitter features universal input capability in 3 variations to accept most of today’s process parameters: Thermocouples, RTDs, DcmV, Potentiometers, Resistance Sensors, DcmA, DCV, AC Amps, Frequency and Pulse.Model HST is fully software driven and all input parameters are programmable. An external hand-held programmer, an integral transmitter mounted programmer, or HART protocol hand-held enables on site calibration, and indication of process parameters. Other features of the Model HST include high precision linearization for thermocouple and RTD sensor inputs, inverse output capability, variable input signal damping, sensor breakdown indication, full display scaling capability, auto-zero input, and more. Heavy duty metal case construction and carefully designed input and output circuitry ensures a high degree of protection from adverse environmental conditions to maximize RFI/EMI immunity.
pdf_pic General Specifications
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