Description

Application

  • Linearised temperature measurement with PT100/1000, Ni100/1000, or Thermocouple sensor.
  • Difference or average temperature measurement of 2 resistance or Thermocouple sensors.
  • Conversion of linear resistance variation to a standard analogue current signal, for instance from valves or Ohmic level sensors.
  • Amplification of a bipolar mV signal to a standard 4-20 mA current signal.
  • Connection of up to 63 transmitters can be connected in a multidrop cummincation setup (HART 7)

Features

  • RTD, TC, Ohm, or mV input
  • Extremely high measurement accuracy
  • HART® communication
  • Galvanic isolation
  • 1- or 2-channel version
  • 6335D can be installed in EX zone 0

HART Protocol

The HART protocol provides a uniquely backward compatible solution for instrument communication as both 4-20 mA analog and digital communication signals are transmitted simultaneously on the same wiring. The Loop Link Programming Kit can configure the individual transmitters for multidrop mode and provide it with a unique polling address. The HART protocol revisions can be changed by user configuration to either the HART 5 or HART 7 protocl. HART provides many benefits promised by fieldbus, while retaining the compatibility and familiarity of existing 4-20mA systems.

HART® 7 protocol offers:

  • Long tag supported (up to 32 characters).
  • Enhanced Burst Mode and Event Notification with time stamping possibillity.
  • Device variables with status, can be mapped individually to any dynamic variable PV, SV, TV or QV.
  • Measuring of trending in the process signal.
  • Automatic event notification with time stamps.
  • Command aggregation for higher communication efficiency.

Options

Type Version Galvanic Isolation Channels
6337

 A: Standard
D: ATEX		 2: 1,500 VAC

 A: Single
B: Double

If required, Omni Instruments will program a 6337 to your specific requirements. Please contact us for details.