DM, EKM pressure and vacuum gauges

The unit has an increased loading capacity and protection from vibration-caused false activation.

Purpose, application

Pressure gauges (DM, EKM), vacuum gauges(DA), vacuum gauges(DV) hereiafter “pressure gauges” (pic. 1, 2. ) in a set with MS-3-... signal device are designed for measurement of excessive and vacuum pressure of non-crystallized liquids, vapour and gases, not corrosive to parts(being in contact with monitored media) material, as well as for discrete control of auxiliary and regulating devices.
Pressure gauge in a set with MS-3...signal device might be used for pressure control in technological systems in oil and gas, chemical, food, pharmaceutical and municipal industries.
Pressure gauge in a set with signal device might be used for double wall tanks interstitial tightness monituring as well as for flange sealing ring tightness control.

Design, operation principle

Pressure gauge design: Pressure gauges are manufactured on the basis of non explosion-proof devices:
- DM (DA, DV)... - pressure gauges with sliding contacts -see pic. 1;
- EKM ... - pressure gauges on micro switches - see on pic. 2.
Explosion-proof feature of pressure gauges is achieved by their enhancement and combination with MS-3...signal device that plays a role of IS barier. Pressure gauges enhancement doesn’t involve their measurement mechanism and is based on contact shunting with diodes as well as in additional checking and marking.
Principle of operation: Pressure thresholds setting is executed by setting the pressure gauge signal pointers accordingly. Normally, pressure gauge electrical contacts are closed shortly. When the threshold level is reached the contacts are being opened and electric current flows in one direction - via diode, that shunts the contacts. MS-3 signal device is able to emit the corresponding LED signal, emit the sound signal and switch the output relay (see section “MS-3-2R signal devices”.
False activation protection is provided by MS-3... signal device, which executes logical conversion of pressure gauge pulsed signals, occuring as a result of terminals chatter during vibration or bad contact.

Designation, modifications

Designation, modifications, technical features of the devices are given in table 1.
Notes:
1)DA2010/DA2005-Ex pressure and vacuum gauges with measuring range of from -1 up to 0,6 bar are used for double-wall tanks interstitial tightness control, providing a possibility to register pressure drop from 0,2bar up to 0 bar.
2) DM2010 (DM2005) and EKM-100 (EKM-160) pressure gauges are used for LCG tanks interstitial space tightness control in normal and emergency operation modes. In this case both are possible: pressure drop during leakage of external wall, and pressure rising during leakage of internal wall. (pic. 3).
Signal devices modifications - see sections “MS-3-2R signal devices”, and “MS-3 signal device”.

Tecnhical features

Designation

Pressure gauge

DM2010-Ех

DM2005-Ех

Vacuum meter

DV2010-Ех

DV2005-Ех

Manovacuum meter

DA2010-Ех

DA2005-Ех

Pressure gauge

EKM-100-Ех

(EKM100Nvm-Ех)

EKM-160-Ех

(EKM160NVm-Ех)

Pressure gauge

EKM-100Vm-Ех

EKM-160Vm-Ех

Limits

of measurement (kgf/cm2)

From 0 up to 1; 1,6; 2,5; 4; 6; 10; 16; 25; 40; 60; 100; 160; 250; 400; 100; 1600

From -1 up to 0

From -1 up to 0,6; 1,5; 3; 5; 9; 15; 24

EKM100: from 0 up to 4; 6; 10; 16; 25; 40

EKM160: from 0 up to 6; 10; 16; 25; 40; 60; 100; 160; 250; 400

EKM100: from 0 up to 4; 6; 10; 16; 25; 40

EKM160: from 0 up to 6; 10; 16; 25; 40; 60; 100; 160; 250; 400

Accuracy class

DM2010 – 1,5

DM2005 – 1,5 (1,0 available upon request)

DM2010 – 1,5

DM2005 – 1,5 (1,0 available upon request)

DM2010 – 1,5

DM2005 – 1,5 (1,0 available upon request)

2,5 (1,5 available upon request)

2,5 (1,5 available upon request)

Activation variations (+-%)

2,5 (1,5 for 1,0 accuracy class)

2,5 (1,5 for 1,0 accuracy class)

2,5 (1,5 for 1,0 accuracy class)

4 (2,5 for 1,5 accuracy class)

4 (2,5 for 1,5 accuracy class)

Average ambient air temperature range, degress, С

 

-50…+60

 

-50…+60

 

-50…+60

 

-50…+60

 

-50…+60

Water and dust ingress protection

IP53

IP53

IP53

IP54

IP40

Explosion protection marking

0Ex ia IIB T6 Ga

0Ex ia IIB T6

0Ex ia IIB T6

0Ex ia IIB T6 Ga

0Ex ia IIB T6 Ga

Housing diameter

DM2010-Ех – 100 mm

DM2005-Ех – 160 mm

DV2010-Ех – 100 mm

DV2005-Ех – 160 mm

DA2010-Ех – 100 mm

DA2005-Ех – 160 mm

EKM-100-Ех – 100 mm

EKM-160-Ех – 160 mm

EKM-100-Ех – 100 mm

EKM-160-Ех – 160 mm

Details material:

-housing

-fitting

 

- steel;

- brass.

 

- steel;

- brass.

 

- steel;

- brass.

 

- stainless steel;

- brass.

 

- steel;

- brass.

Thread

М20х1,5-Bg (by default); G1/2-B; R1/2

М20х1,5-Bg (by default); G1/2-B; R1/2

М20х1,5-Bg (by default); G1/2-B; R1/2

М20х1,5-Bg (by default); G1/2-B

М20х1,5-Bg (by default); G1/2-B