Max Machinery 290 Series Frequency (269, 294 and 295) - Manual (Page 3)

3 IH 295-000-350 • rev. 6/2011 • ©2010-11 Max Machinery, Inc.
The Max frequency 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
for electrical connections and temperature ranges 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
new 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 frequency proportional to the flow rate. Advanced signal processing provides
both fine angular resolution (0.36 degrees rotation per pulse) and rapid response (output updated
every one ms).
These transmitters are typically mated to a mechanical flow meter, configured, and calibrated at
the factory as a matched set. This ensures accuracy and allows quick setup in the field. For field
installations where the transmitter has not been setup with a meter at the factory, an optional serial
interface kit provides full access to all configuration options and parameters.
Transmitter Features
High resolution measurement - 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 frequency 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 the interface software (Models 269 and 294), or a
button on the PCA (Models 295 and 296).
Anti-Dither Pulse Buffer - Prevents undesired reverse pulses which can occur at very low flow rates
in the presence of vibration or hydraulic noise. If the meter reverses direction and then resumes
forward rotation, the pulse count will represent only the total forward flow. Reverse flow exceeding
the pulse buffer setting will result in an output frequency proportional to reverse flow rate. The
buffer quantity can be set from 1% to 100% of a revolution.
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General Description
Ex Proof
Model 295
Model 296