DM, EKM pressure and vacuum sensors
Purpose, application
Pressure sensors (DM, EKM), vacuum sensors(DA), vacuum sensors(DV) hereiafter “pressure sensors” (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 sensor 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 sensor 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 sensor design: Pressure sensors are manufactured on the basis of non explosion-proof devices:
- DM (DA, DV)… - pressure sensors with sliding contacts -see pic. 1;
- EKM … - pressure sensors on micro switches - see on pic. 2.
Explosion-proof feature of pressure sensors is achieved by their enhancement and combination with MS-3…signal device that plays a role of IS barier. Pressure sensors 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 sensor signal pointers accordingly. Normally, pressure sensor 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 sensor 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 sensors 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 sensors 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 sensor DM2010-Ех DM2005-Ех |
Vacuum meter DV2010-Ех DV2005-Ех |
Manovacuum meter DA2010-Ех DA2005-Ех |
Pressure sensor EKM-100-Ех (EKM100Nvm-Ех) EKM-160-Ех (EKM160NVm-Ех) |
Pressure sensor 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 |