Head Mounting Universal Input 4~20mA Transmitter

Product Code: TXHU

The TXHU range of low-cost, loop powered, microprocessor based linearised transmitters have, as standard, a universal input that accepts RTD (Pt100 or Pt1000) and Thermocouple (Types K, J, T, N, E, R, S, B) inputs.

The transmitters can be supplied pre-ranged to suit your application requirements or can be easily configured using the TX-USB configuration kit. Simply install the software (which is available for free download from our website), connect the USB configuration module and plug the lead into the transmitter. The software will then provide the necessary prompts.

  • Features
  • Technical
  • Documents
  • Software
    • Microprocessor based and fully linearised
    • Accepts RTD (Pt100 or Pt1000) and Thermocouple (K, J, T, N, E, R, S, B) inputs
    • 4~20mA, 2-wire output (loop powered)
    • Supplied pre-ranged (can be easily configured)
  • Technical Details (Common)
    Output 2-wire, 4~20mA (loop powered)
    Power Supply 9.5-36V DC
    Supply Voltage Sensitivity  < ±0.005%/V FSO
    Output Load Resistance 700Ω at 24V DC (50Ω/V above 9.5V DC)
    Maximum Output Currrent Limited to < 28mA (emission & immunity)
    Accuracy < ±0.03% FSO typical
    Ambient Drift < ±0.003%/°C FSO typical
    Noise Immunity 125dB CMRR average (2.0kV DC limit)
    R.F. Immunity <1% effect FSO typical
    Reponse Time 400ms typical (10-90% 300ms typical)
    Sensor Break Output Drive Function high upscale/low downscale
    USB Programmable Zero  0 to ±99% of the span 
    Operating Temperature -20°C to +65°C (-4°F to +149°F)
    Storage Temperature -20°C to +100°C (-4°F to +212°F)
    Operating Humidity 5-85% RH max (non-condensing)
    Dimensions 44mm (W) x 23mm (H) x 44mm (D)
    EMC Compliance Emissions (EN 61326)
    Immunity (EN 61326)
    Safety (EN 61010-1)


    RTD Input Specifications
    Input Pt100 or Pt1000 DIN 3-wire type
    (2-wire can be used with offset calibration)
    Sensor Current 0.15mA nominal
    Lead Wire Resistance Pt100: 10Ω/wire max.
    Pt1000: 5Ω/wire max.
    0.02% FSO offset error per Ω of lead resistance
    Accuracy ≤ 0.3°C
    USB Programmable Span -200°C to +850°C (-328°F to +1562°F)
    Linearity (Pt100) 0.02% FSO for span inputs ≤ +200°C (+392°F)
    0.1% FSO for span inputs ≤ +850°C (+1562°F)
    Linearity (Pt1000) 0.02% FSO for span inputs ≤ +200°C (+392°F)
    0.2% FSO for span inputs ≤ +520°C (+968°F)


    Thermocouple Input Specifications
    Thermocouple Types K, J, T, N, E, R, S, B
    Input Impedance 1MΩ min
    Thermocouple Lead Resistance 100Ω max
    Cold Junction Compensation -20°C to +65°C (-4°F to +149°F)
    CJC Error < ±2°C
    Accuracy Types K, J, T, N, E: < ±2°C
    Types R, S, B: < ±3°C
    Temperature Drift Types K, J, T, N, E: < ±0.05°C
    Types R, S, B: < ±0.2°C
  • No software available