D625 Users Manual
HISTORY OF ANALYTICAL FLOW TECHNOLOGIES
The DENSITRAK® D625 liquid density meter was ORIGINALLY designed by Calibron Systems, Inc.
of Scottsdale, AZ. Calibron Systems, Inc. was eventually acquired by Honeywell Enraf. Honeywell
Enraf licensed the exclusive rights for manufacture and service of the DENSITRAK® meter to
Analytical Flow Technologies in March 2010.
Analytical Flow Technologies is owned and operated by Paul Heinritz, who has a long relationship
with the DENSITRAK® Densitometer in which he ran the DENSITRAK® product line for Calibron
Systems, Inc. and briefly for Honeywell Enraf prior to the DENSITRAK® production move to Pune,
India. Analytical Flow Technologies emphasizes American-Made products, along with high quality
customer service and support to differentiate itself from the large corporation alternatives.
THEORY OF OPERATION
The liquid density meter uses the spring mass principle for measuring the fluid density. A portion of
the measurement tube is energized (transmit sensor) to vibrate and to maintain its natural
resonant frequency by using an electrical feedback driving system. A change in the vibrating mass,
(as a result of change in the fluid density) shifts the resonant frequency which is interpreted by the
receive sensor. The signal is then output to the density processing unit via the rear mount electrical
connector.
An ANALYTICAL FLOW TECHNOLOGIES density processing unit uses algorithms that incorporate
temperature (integrated into the meter), pressure (via an external pressure transmitter 4-20mA
output) and the shift in frequency to determine the density of the measured fluid.
FIGURE 1: CUTAWAY VIEW - DENSITRAK D625 VIBRATING TUBE DENSITOMETER
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