DM8 Liquid Density Analyzer
In 1967, Yokogawa developed the model VD6 vibration type liquid density analyzer in response to user requests for an online density analyzer that could be used in process automation. This was an important development in the instrumentation field, because density is a fundamental physical quantity, and its accurate measurement is important to almost all processes. The VD6 density analyzer has gone on to develop an excellent reputation as a highly stable, high sensitivity meter.
The new DM8 vibration type liquid density analyzer is a highly reliable, multi-function meter that builds on the experience gained with the VD6. It takes advantage of the latest computer technology to integrate a wide range of sensor techniques. Its converter incorporates a microprocessor that directly converts sensor frequency signals into density values for display. It is provided with a variety of functions such as one-touch calibration, self diagnosis and digital output (RS-232C).
|Bulletin for DM8|
|General Specification for DM8|
|User's Manual for DM8|
|High sensitivity and stability.|
|One touch calibration with a standard calibrating solution.|
|Free setting of measuring range in the field.|
|Failure alarm display and output.|
|Outdoor installation of converter.|
|Measurement object||Liquid density|
|Measurement principle||Vibration density measurement|
|Measurement range||Density :0.5 to 2.0 g/cm3|
|Measuring liquid temperature||-10 to 100℃|
|Measuring liquid pressure||2 MPa G or less|
|Withstandable pressure||4.9 MPa G|
|Output signal||Analog output:4 to 20 mA DC (load resistance 550 Ω or less), and 0 to 1 V DC (load resistance 250 kΩ or more), isolated output.
Digital output: RS-232C
|Output signal span||0.05 to 0.5 g/cm3 settable|
|Reference temperature set range||0 to 100℃ (in increments or decrements of 1℃)|
|Contact output on failure||One output|
|Settable range for temperature coefficient||0 to 0.002 g/cm3/℃|
|Calibration procedure||One-touch calibration by strong calibration liquid density (one-point calibration)|
|Ambient temperature||-10 to 55℃|
|Case construction||Dust and rain proof construction|
|Power supply||90 to 132 V AC or 180 to 264 V AC, 50/60 Hz|
|Weight||Approx. 7.5 kg (Converter), approx. 12.0 kg (Detector)|
Overall performance after combining the detector and converter.
|Linearity||±0.5 % of span (when span is 0.2 g/cm3 or less)|
|Repeatability||5 x 10-4 g/cm3 (for digital output)
1 % of span (for analog output)