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

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