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7ML19981CM01.1
MERCAP – INSTRUCTION MANUAL
Page 3
Introduction
The Mercap system is a high performance, level measurement instrument consisting of a
sophisticated, easy-to-adjust, transmitter (MST9500) combined with measurement electrodes
and process seals designed to accommodate numerous configurations. The electrode,
comprised of a measurement section and an active shield section, is the primary sensor of
the system, and it indicates the electrical capacitance value of the measurement section
relative to the environment (tank wall, stilling well, or conductive material). This electrode
then connects to the capacitance detector portion of the two-wire loop powered electronic
transmitter. The measurement section can be set up to measure the level of solids, liquids
and slurries, as well as the interface between two immiscible liquids.
The manual is presented in three sections:
1.
The electrode process connections and seals
2.
The transmitter
3.
Appendix sections providing supplementary information.
Identifications and Abbreviations
Various mnemonics and abbreviations are used in this manual. See below:
Short form
Long Form
Description
Units
CE /FM /CSA
Conformitè Europèene/
Factory Mutual/Canadian
Standards Association
DAC
Digital Analog Converter
DCS
Distributed Control System
Control Room apparatus
Ex
Explosion Proof
Exd
Flame Proof
FV
Full Vacuum
ESD
Electrostatic Discharge
HART
TM
Highway Addressable
Remote Transducer
LRV
Lower Range Value
value for 0 %
4 mA
LSL
Lower Sensor Limit
below which PV is incorrect
pF
pico Farads
0.000000000001
Farad
ppm
parts per million
PV
Primary Variable
measured value
Stilling Well
grounded metal tube with
openings
SV
Secondary Variable
equivalent value
SVLRV
Sec. Var. Lower Range Value
0 % equivalent value
SVURV
Sec. Var. Upper Range Value
100 % equivalent value
µ
F
micro Farads
0.000001
Farad
URV
Upper Range Value
value for 100%
20 mA
µ
Sec
micro Seconds
0.000001
Seconds
USL
Upper Sensor Limit
above which PV is incorrect
HART
TM
Communication Foundation, Austin, Texas, USA
Siemens Automation