Eurotherm Input Signal Conditioner, Q438
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Q438 Input Signal Conditioner

Brand: Eurotherm
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The Q438 is a DIN rail mount, potentiometer input signal conditioner with 1,800 Vdc isolation between DC power and the input/ output circuitry.

The input provides a constant voltage and is designed to accept any three-wire potentiometer from 100 to 100 KiloOhms.

The field configurable output is switch selectable providing a 0 to 5 V, 0 to 10 V, 0 to 1 mA, 0 to 20 mA or 4-20 mA DC signal.

Wide ranging, precision zero and span pots, used in conjunction with DIP switches, allow 80% adjustablity of offset and gain to transmit a full scale output from any 20% portion of the potentiometer input.
Features
  • Accepts potentiometers from 100 to 100 KiloOhms
  • Wide ranging zero and span
  • ASIC technology
  • High density DIN rail mounting
  • Flexible DC power supply 9 to 30 Vdc
  • SnapLoc plug-in terminals

Specifications

Brand

Accuracy

  • ± 0.1 %, Max.

Approvals & Certifications

  • CSA C22.2 No. 0-M91 & 142-M1987 (File No. LR42272-84)
  • UL (C,US)
  • UL 508 (File No. E99775)

Consumption

  • Power Consumption: 1.5 W Typical
  • Power Consumption: 2.5 W, Max.

Display

  • Green LED

Electrical Connectors

  • Plug-In Terminal

Electrical Contacts

  • Normally Closed

Electrical Rating

  • 0-1 mA at 7.5 V, Max.
  • 0-20 mA at 12 V, Max.

Excitation Voltage

  • Potentiometer Input: 500 mV, 5 mA - Max.

Humidity

  • Operating: 15 to 95 % Non-Condensing at 45° C (113° F)
  • Soak: 90 % Non-Condensing for 24 Hours at 65° C (149° F)

Hysteresis

  • ± 0.1 %, Max.

Input

  • 0 to 100 %
  • Potentiometer

Input Impedance

  • Output Current (Source Impedance): > 100 kiloohms
  • Output Voltage (Source Impedance): 1 megaohms

Isolation

  • 1,800 Vdc between Line Power & Input, Output

Linearity

  • ± 0.1 %, Max.

Mounting

  • DIN Rail Mounting

Operating Temperature

  • 0° to 55° C (32° to 131° F)

Output

  • 0-10 V
  • 0-20 mA
  • Voltage Drive: 10 mA - Max.

Power Supply

  • Universal DC: 9-30 Vdc

Resistance

  • Potentiometer Input (End-to-End): 100 ohms to 100 kiloohms

Response Time

  • 10 to 90 %: < 200 milliseconds, Typical

Span & Zero Adjustments

  • Potentiometer Input (Zero Turn-Up, Span Turn-Down): 80 % of Full Scale Input

Stability

  • < ± 0.05 %/°C, Max.

Storage Temperature

  • -25° to 70° C (-13° to 158° F)

Switch Type

  • DIP Switches

Documentation

Data Sheets

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