Continuous-Flow Process Viscometer PV100-DM64

The process viscometer PV100-DM64 works on the principle of a rotational viscometer with coaxial cylinder systeme.

Its basic components are a measuring head and a continuous-flow measuring unit connected by a flange sleeve. The measuring head holds the drive unit, which is either a controllable d.c. motor or a synchronous motor, as well as the torque sensor und the electronics producing the measuring signal.

From the measuring head, the rotation is transferred through a spacer shaft to the permanent-magnetic coupling, which is supported in the pressure-proof measuring sleeve. The magnetic field transfers the torque through the thin-walled measuring sleeve to the rotating measuring element. The latter is enclosed by the measuring beaker. The measuring element is supported by low-friction pin suspensions in the measuring sleeve and measuring cup.

Measuring sleeve, measuring element and measuring cup form a coaxial double-slotted cylinder measuring system. The measuring system is enlosed by the continuous-flow cell through which the measured substance can flow in a main and a partial stream.

Due to a specific design, part of the substance flow is continuously led through the measuring gap of the cylinder system. The viscosity-proportional torque occurring on the measuring bob is measured in the measuring head and converted into an electric standard current signal 4...20 mA, which can be used for display and as a control signal.

The immersion measuring device is designed for use with open containers or closed vessels up to high operating pressures. The immersion depth of measuring system is variable within wide limits by the length of the flange sleeve.

The process viscometer can be completed with an electronic unit for more functions of instrument control, signal processing, as well as temperature adjustment of viscosity.

Recommended Applications

Technical Data

Measuring Head	MH10	MH16	MH16G
viscosity range [mPas]	2 to 104	20 to 105	103 to 107
speed range [rpm] (8 adjustable steps)	1 to 250	1 to 250	0.01 to 2.5
in connection with spindle systeme	MS-ZP1	MS-ZP2	MS-ZP2
shear rate range [s-1]	4.4 to 1.1 * 103	7.64 * 10-1 to 191	7.64 * 10-3 to 1.91
shear stress range [Pa]	2.2 to 44	4 to 76.4	4 to 76.4

accuracy	2.5 %
pressure range	up to 64 bar
temperature range	-20 °C to +300 °C
mechanical connections of flow cell	flange connections DN25 to DN100
flow rate range (for DN40)	0.1 to 6 m3/h
materials for components that are exposed to the measured substance	1.4571 (DIN 17440)
explosion protection	II 2G EEx de IIB T6 (according to ATEX standard)
protection class	IP54
climatic conditions	-25/55/30/90//42 (S02)1-3
installation position	max. 30° deviation from vertical (or overhead operation)
power supply	motor:    24 V DC, 500 mA signal circuit:    24 V DC, 20 mA (supplied from an external source or by PV100 control unit VC1)
measuring signal	4...20 mA to Ra ≤ 350 Ohm analogous, digital via RS485 interface

Optional