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7ML19981CM01.1
MERCAP – INSTRUCTION MANUAL
Page 9
Mercap Configurations
The Mercap is a versatile level measurement instrument that can be designed for your
specific application by taking the following conditions into consideration:
Process Connections
Any standard process connection is available with Mercap, and special versions can be
fabricated to match the mounting and application requirements. Various sizes of threaded
and flanged fittings are available.
Seal Types
The basic internal seal for the Mercap is of a conical-shaped, preloaded pressure/leak
resistant construction. Up to three levels of seal protection are implemented depending on
the integrity requirements of the application. A single or double cone internal seal forms 1 or 2
blocks against leaking, and a third flange face gasket is also available in the D and DD seal
construction. The flange face seal also provides a design with no metal wetted parts if
required.
Pressure and Temperature Considerations
The maximum temperature and pressure of operation for the standard Mercap level probe is
200
°
C (392
°
F) and 200 bar (2900 psi). There are, of course, qualifications that must be applied
to these maximums.
Enamel probes are suggested when process temperature exceeds 200
°
C, and/or in
combination with very high pressure.
Note
:
: :
:
Consult Milltronics for chemical applications other than water.
Process Connection and Seal Configuration of Mercap
Process Connection
Process Connection
Process Connection
Process Connection
Seal Type
Seal Type
Seal Type
Seal Type
Seal Description
Seal Description
Seal Description
Seal Description
Threaded
S
Single Cone
Welded Flange
S
Single Cone
S
Single Cone
D
Single Cone + Teflon flange seal
DD
Double Cone + Teflon flange seal Consult factory*
SD
Double Cone (used for stilling well applications)
Solid Machined
Flange
HP
Consult factory*
Note
: HP (high pressure) is only supplied with enamel insulation and a recommended
stilling well for protection of the enamel. A cone seal plus a secondary redundant seal
is provided between the electrode and the stilling well.
Siemens Automation