1 x 10-9 smL/sec of Helium maximum to the outside environment.

ALARM conditions become true when the current flow reading is equal or higher / lower than corresponding values of high and low alarm levels

Alarm action can be assigned to activate the contact closer separate for High and Low pressure alarm

Alarm action can be assigned to activate the contact closer separate for High and Low temperature alarm

Alarm action can be assigned with preset delay interval 0-3600 seconds to activate the contact closer separate for High and Low alarm

All features of the flow meter can be accessed via the local four button keypad and LCD

Assign action at a preset total volume

Auto Zero

Both keypad menu and digital interface commands are provided to Set the totalizer to ZERO

Contact Closure

Conversion Factors

Conversion factors for up to 32 gases are stored in the DFM

Conversion factors may be applied to any of the ten gas calibrations via keypad or digital interface commands

DFM flow meter support various functions including flow totalizer, flow, temperature, pressure alarms, automatic zero adjustment, 2 relay outputs, 0-5 Vdc analog outputs for flow, pressure and temperature

Engineering Units

Flow Alarm

Flow meter can be programed locally by the four button keypad and LCD or remotely via RS-232 / RS-485 interface

High and Low gas flow ALARM limits can be preprogrammed via keypad or remotely via digital interface

High and Low gas pressure ALARM limits can be preprogrammed via the keypad or remotely via digital interface

High and Low gas temperature ALARM limits can be preprogrammed via the keypad or remotely via digital interface

In addition provision is made for a user defined conversion factor

Interface

Leak Integrity

Multi-Gas Calibration

Pressure Alarm

Pressure alarm conditions become true when the current pressure reading is equal or higher than corresponding values of high pressure alarm settings or equal or lower than corresponding values of low pressure alarm settings

Provisions are made to either start, read or save the current auto zero value via digital commands

Read totalizer

Start / Stop totalizing the flow

Start the totalizer at a preset flow

Temperature Alarm

Temperature alarm conditions become true when the current temperature reading is equal or higher than corresponding values of high temperature alarm settings or equal or lower than corresponding values of low temperature alarm settings

The DFM is capable of storing primary calibration data for up to 10 gases

The DFM supports automatic sensor zero offset adjustment which can be activated locally via the keypad or remotely via digital interface

The Following Units of Measure are Supported F.S., L/min, L/h, mL/min, mL/h, scuft/h, scuft/min, lb/h, lb/min, one user defined engineering unit

The analog interface provides 0 to 5 Vdc outputs for flow, pressure and temperature

The auto zero feature requires absolutely no flow through the meter during auto zero process

The digital interface operates via RS485 and provides access to applicable internal data including flow, temperature, pressure reading, auto zero, totalizer and alarms settings, gas table, conversion factors and engineering units selection, dynamic response compensation and linearization table adjustment

The measured gas flow and associated totalizer data are scaled directly in engineering units via the front panel keypad or digital interface

The total volume of the gas is calculated by integrating the actual gas flow rate with respect to time

This are programmable via the local keypad or digital interface such that the relays can be made to switch when a specified event occurs e.g

This feature allows the same DFM to be calibrated for multiple gases while maintaining the rated accuracy on each

Totalizer

Totalizer conditions become true, when the totalizer reading and the Stop at Total volumes are equal

Two sets of dry contact relay outputs are provided to actuate user supplied equipment

When a low or high flow, pressure or temperature alarm limit is exceeded or when the totalizer reaches a specified value