PREFACE P-1
General Information
Description
The Chandler Engineering Inline (Flow-Thru) Viscometer is a low pressure couette
(cup/bob) viscometer for real time measurement of oilfield fluids during treatments. The
instrument is connected in a sample line from the clean fluid delivery line.
The viscometer measures viscosity at the standard 511 sec
-1
using the API standard R1 rotor,
B1 bob, and F1 spring. The spring is calibrated to provide 1 degree of rotation per 1
centipoise of viscosity.
Clean fluid flows into the instrument, where a specially designed rotor (cup) pulls fluid into
the gap between the rotor and the bob, when the rotor is turning. This design feature allows
the instrument to measure continuously at a constant sample rate while being insensitive to
flow rate through the instrument. Fluid in the gap is sheared producing a torque on the bob.
This torque is transmitted to the resisting spring using a magnetic drive. The magnetic drive
not only mechanically supports the bob but allows the torque to be transmitted without shaft
seals. The bob rotation is measured with a high precision encoder. The encoder signal is
then scaled to viscosity.
Optional pH measurement system is available.
Features and Benefits
• Based on API geometry.
• Standard analog 4-20mA signals for data acquisition.
• Easy to set-up, easy to operate, easy to clean and maintain.
• Broad range of sensitivity/scalability through the use of different rotor/bob and spring
combinations to accommodate a wide variety of fluid types.
• 12 VDC power for field operation.
• Meets IP67 for outdoor environment.
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