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(writing) drawing pen leaves the thin track at very small friction on
the blank. The pen draws an arc which is proportional to the pressure
at the constant movement of the carriage (glass). As a result the record
in the coordinate axes P and T (pressure and time) is received
on the blank.
1 – clockwork drive;
2 – reduction gear; 3 – lead
screw; 4 – carriage (glass);
4 – pen; 6 – sleeve; 7 – body;
8 – helix; 9 – bellows;
10 – body of bellows.
Figure 11.1 – The chart of
helix downhole pressure gage
DPGNS-2 (МГН-2).
The main technical characteristics of helix downhole pressure
gage DPGNS-2 (МГН-2) are given in table 11.1. For example
technical characteristics of downhole pressure gage DPGNS-2-400
(МГН-2-400) are the following: the range of pressure measurement is
from 0 to 40 MPa; the maximum temperature is 160 °С; the length is
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