Installation; Storage And Conditions At Delivery; Mounting On Site; External Mounting - GE Masoneilan 12420 Instruction Manual & Safety Manual

4. Installation

4.1. STORAGE AND CONDITION AT DELIVERY
Level instruments have been carefully packed in our premises to
prevent them from damage during handling and transportation.
Units must be stored in an area where temperatures are
between -50 °C and +93 °C.
Units are factory dry calibrated (simulation by weight) to the
service specific gravity specified by the customer.
When service specific gravity has not been specified, units are
factory dry calibrated to a specific gravity of 1.
Recalibration is recommended when the actual specific gravity
differs from calibration specific gravity.
Recalibration is needed when verification of instrument
performance is made with liquid in the displacer chamber.

4.2. MOUNTING ON SITE

Unpack the unit carefully and record the serial number for future
reference. Remove the shipping stud that secures the displacer in
the chamber.
Whenever possible, locate the instrument at some easily
accessible, well-lighted place on the vessel. The location must
have ambient temperature at the instrument case within the
range of -50 °C to +80 °C (unless limitations due to hazardous
area approvals – see Section 2).
NOTE: Do not remove instrument cover until the unit has been
installed and is ready for calibration.
The codes shown on numbering system indicate the instrument
designation as a function of various installation modes, displacer
chamber connections, and environmental standard or protection
of the case against explosion. Figures 3 and 6 show the various
ways of installing the displacer chamber.
4.2.1. E
XTERNAL MOUNTING
(Chamber Type Model, Figures 3 & 4)
Install the instrument in a vertical position on the side of the tank
or vessel, so that the mid-range mark on the chamber is at
normal level. The mid-range is marked on the chamber.
The equalizing lines between chamber and vessel must be the
same size as the chamber connections. Install a block valve in
each line.
The use of a drain connection is recommended as shown in
Figure 3.
CAUTION: The displacer is always immobilized in the displacer
chamber to avoid any internal damage during transportation.
During the level installation, the displacer has to be unlocked by
unscrewing the M6 stern at the drain.
® 2014 General Electric Company. All rights reserved.
MID
RANGE
Type 12400 (Screwed NPT, BW, SW)
Type 12401 (Flanged)
MID
RANGE
Type 12405 (Screwed NPT, BW, SW)
Type 12408 (Flanged)
Masoneilan 12400 Series Transmitter/Controller Instruction Manual | 13
MID
RANGE
Type 12409 (Screwed NPT, BW, SW)
Type 12402 (Flanged)
MID
RANGE
Type 12406 (Screwed NPT, BW, SW)
Type 12407 (Flanged)
Figure 4