Max Machinery 243 Helical Flow Meter - Manual (Page 5)

Max Machinery, Inc. 240 Series User Manual © Copyright 2013 Rev. 002Q4 5
Transmitter General Description
Max transmitters are designed to work with the entire family of Max Flow Meters to provide extremely precise flow
measurement in a cost effective package. Different options of industrial housings or IP66 rated explosion proof
enclosures, combined with a choice of one-part and two-part, high temperature designs with remote electronics cover a
wide range of application environments – from the laboratory to harsh industrial processes.
This latest generation of transmitters use modern sensor technology coupled with advanced signal processing to deliver
high levels of performance and reliability. Hall sensors are used to detect the position of a driven magnet inside a Max
Flow Meter. Changes in position are tracked by a microprocessor, which generates an output proportional to the flow
rate. Advanced signal processing provides both fine angular resolution (0.36 degrees rotation) and rapid response
(output updated every one millisecond).
Max transmitters are typically mated to a mechanical flow meter, configured, and calibrated at the factory as a set.
This ensures accuracy and allows quick setup in the field. For field installations where the transmitter has not been set
up with a meter at the factory, an optional serial interface kit may be purchased to give full access to configuration
options
and parameters.
Transmitter Features
High resolution measurement –
Analog Output: Configured output ranges to any value within ± 10 Vdc or ± 20 mA.
Frequency Output: Configured output resolution of 1 to 1000 pulses per revolution.
Linearization of up to 16 points to fully describe the flow meter’s output curve and achieve the highest system
linearity over the meter’s entire operating range.
Compensation Algorithm – Compensates for variations in Hall sensor
and flow meter characteristics to provide a stable, undamped output
that accurately represents the instantaneous flow rate. This feature
is factory set when the meter and transmitter are mated together. If
the transmitter is changed, the compensation can be performed via a
button on the circuit board.
Anti-Dither Buffer - Masks the false output that may occur at very
low flow rates in the presence of vibration or hydraulic noise. If the
meter reverses direction the output signal will be interrupted for a
user selected portion of a meter rotation. Reverse flow exceeding
the buffer setting will result in an output proportional to reverse flow
rate. The buffer quantity can be set from 1% to 100% of a revolution.
Model 289
Model 295
Analog/ Frequency
Ex Proof Housing