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hydroswitch are intended for installing in the pipe formation testers.
Downhole pressure gages DPGU-3 (МСУ-3) with the momentum
timing marker are applied for researching the steam injection wells.
Downhole pressure gages DPGU-1 (МСУ-1), DPGU-HA1

(МСУ−Т1) and DPGU-C-1 (МСУ-К-1) consist of manometer
unit, recording mechanism, clockwork drive and maximum
thermometer. Downhole pressure gages DPGU-2 (МСУ-2), DPGU-

HA2 (МСУ−Т2) and DPGU-C-2 (МСУ-К-2) consist of manometer
unit, bellows, clockwork drive, recording mechanism and hydroswitch.

The letters HA in the identification of these downhole pressure
gages mean that this device is of high accuracy (for the downhole
pressure gages DPGU-HA1 (МСУ−Т1) and DPGU-HA2 (МСУ−Т2)
the admissible reduced error is ± 0.25 % and for the devices DPGU-1
(МСУ-1) and DPGU-2 (МСУ-2) the admissible reduced error is from

± 0.6 to ±1.5 %).
The technical characteristics of downhole pressure gages of

DPGU (МСУ) type are given in table 11.3.

Table 11.3 – The technical characteristics of downhole pressure gages

of DPGU (МСУ) type

Index The type of downhole pressure gage
DPGU-1; DPGU-2;
DPGU-3
DPGU-C-1 DPGU-C-2
The upper limit of 10; 16; 25; 40; 60; 80; 25
pressure measuring, MPa 100; 140; 160; 200

The accuracy class, %:
on the direct running 0.25 0.25 –
taking into account the
direct and reverse 0.6; 1; 1.5 0.6; 1; 1.5 2
running
The maximum working 100; 160; 250 400
о
temperature, С
Sizes, mm:
1700
the length 1770 – 1945 1815 – 1990
the diameter 32; 36 32; 36 36
The mass, kg (not bigger) 11.5 11.7 10.7

Downhole pressure gages in anti-corrosion variant DPGU-C
(МСУ-К) are used for measuring the pressure in aggressive

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