Kobold MAS Series, Instruction Manual

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MAS Instruction Manual
Page 19
Figure 4-1
Proper LFE Location
Within The Flow Body
4.2.3
Sensor Tube
CAUTION! Opening the sensor cavity will shift calibra- CAUTION! Opening the sensor cavity will shift calibra-
CAUTION! Opening the sensor cavity will shift calibra- CAUTION! Opening the sensor cavity will shift calibra-
CAUTION! Opening the sensor cavity will shift calibra-
tion.
tion. tion. tion. tion.
Do not remove the PCB Bracket (No. 7) unless it is absolutely
necessary to gain access to the sensor cavity. Doing so will shift
the calibration more than 1.5%. The remaining parts of the flow
path are disassembled as shown in the exploded view in Appendix
A. Note the position of the insulation blanket before removal and
re-install in the same fashion. After removal, the sensor tube (No.
5) can be cleaned by purging, washing with a solvent, or by rodding
out the 0.031 inch (.787 mm) internal diameter tube with a 0.029-
0.030 inch (.737-.762 mm) outside diameter rod or wire or with the
Model CK Cleaning Stylet available from Kobold Instruments. To
maximize the time response of your MAS, Kobold has designed
the sensor tube with thin walls. Therefore, when cleaning, be
Therefore, when cleaning, be Therefore, when cleaning, be Therefore, when cleaning, be Therefore, when cleaning, be
extremely careful not to bend the sensor tube or to mar its extremely careful not to bend the sensor tube or to mar its extremely careful not to bend the sensor tube or to mar its extremely careful not to bend the sensor tube or to mar its extremely careful not to bend the sensor tube or to mar its
inlet or outlet edges.
inlet or outlet edges.
inlet or outlet edges. inlet or outlet edges.
inlet or outlet edges.
It is important when reinstalling the sensor to make sure that no
torque is imparted on the sensor tube. Torque can be eliminated
by using a good quality oxygen compatible grease on the sensor
sealing “O”-rings. The sensor assembly should slide freely into
the cavity flanges without having to twist it. Twisting will impart
undesirable torque on the sensor and could lead to long term
shifting of the zero value. Also, take E X T R E M E
E X T R E M E
E X T R E M E E X T R E M E
E X T R E M E care to not
disturb or unravel the sensor windings.
.61
(15.49)
.60
(15.24)
INLET OUTLET
.85
(21.59)
.90
(22.86)
DIMENSIONS IN INCHES
(DIMENSIONS IN MILLIMETERS IN PARENTHESES)