Differential pressure control switches ДЕМ-202С

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Differential pressure control switches ДЕМ-202С (hereinafter – devices) are intended to monitor and regulate pressure in alarm systems, diesel engine protection and control systems, locomotive-type diesel engine systems, refrigeration plants and other systems used in vessels, railway and motor transport, relay pressure control and differential pressure control by opening or closing electric contacts.

Scope of application:

- ventilation, air conditioning and cold supply systems;

- pump, compressor and turbine machine building;

- local automation systems at heat, gas and power supply facilities

Devices are fit for operation under conditions established for versions УХЛ3, ОМ5 as per GOST 15150-69.

General specifications

1. Device designation, specified setpoint range, basic absolute error, actuation range and threshold return area value of devices are in compliance with those given in Table 1.


 

Table 1

Device designation

Specified setpoint range*, MPa

Basic absolute error, MPa, maximum

Actuation range, MPa, maximum

Return area, MPa, maximum

uncontrollable

maximum

ДЕМ-202С-1-01-2

0.05 to 0.6

± 0.03

0.004

0.05

ДЕМ-202С-1-02-2

0.02 to 0.25

± 0.015

0.004

0.03

* “Specified setpoint range” – values of setpoints at which the requirements of technical conditions are satisfied for each device version.

Notes
1. Setting the device to a specific actuation setpoint shall be done by the manufacturer in compliance with the order.
2. If the order does not specify an actuation setpoint, devices shall be set by the manufacturer to the minimum setpoint value within the appropriate specified setpoint range.
3. The customer is allowed to reset a setpoint within the range of values specified in Table 1.

2. Maximum operating pressure of the controlled medium, maximum allowable pressure, and maximum allowable differential pressure of controlled medium for the devices are given in Table 2.

Table 2

Designation

Maximum operating pressure of the controlled medium, MPa

Maximum allowable pressure of the controlled medium*, MPa

Maximum allowable differential pressure*, MPa

ДЕМ-202С-1-01-2

2.5

3.0

3.0

ДЕМ-202С-1-02-2

0.8

2.2

2.2

* Maximum exposure duration is 5 min

 

3. Devices are designed for operation at contact loads specified in Table 3.

Table 3

Current type

Voltage, V

Switching power, W

Current, A

Сos ϕ, as minimum

Frequency, Hz

min.

max.

DC

24 to 220

60

0.05

AC

127; 220;

380; 440

0.1

6

0.6

50 or 60

Notes
1 Minimum value of switched current is 0.1 A with maximum inductance for DC of 5 mH.
2 It is not allowed to use devices for switching minimum currents if they were used at other current loads.

Page 12 of the Catalog

4. The devices are resistant to and preserve parameters under conditions of operating decreased temperature of minus 50°C and operating increased temperature of plus 50°C of ambient air.

5. Temperature of the controlled medium shall be within minus 40 ± 2°С to plus 60 ± 2°С.

6. As to dust or water ingress protection, devices are of version IP64 as per GOST 14254-96.

7. Weight of the device is 1.1 kg as maximum.

Designation structure 

ДЕМ-202С

Note
1 – supplied as an option and specified in the order only.

Ordering information for ДЕМ-202С devices:

1) differential pressure control switch ДЕМ-202С with return area directed towards differential pressure increase in relation to the setpoint, with setpoint range from 0.02 to 0.25 MPa, with EN 175301-803 form А connector, climatic version УХЛ3, with actuation setpoint at 0.2 MPa
“Differential pressure control switch ДЕМ-202С-1-02-2, УХЛ3, setpoint 0.2 MPa ТУ 4212-147-00227471-2012”;

2) idem, if a setpoint actuation value is not specified in the order
“Differential pressure control switch ДЕМ-202С-1-02-2, УХЛ3 ТУ 4212-147-00227471-2012”;

3) differential pressure control switch ДЕМ-202С with return area directed towards differential pressure increase in relation to the setpoint, with setpoint range from 0.05 to 0.6 MPa, with EN 175301-803 form А connector, climatic version ОМ5, if supplied for export, and with installation kit К1
“Differential pressure control switch ДЕМ-202С-1-01-2, ОМ5, Э, К1 ТУ 4212-147-00227471-2012”.

Overall and mounting dimensions 

ДЕМ-202С

Figure 1 – Overall and mounting dimensions of ДЕМ-202С differential pressure control switches 

ДЕМ-202С

Figure 2 – Overall and mounting dimensions of ДЕМ-202С differential pressure control switches with К1 kit

Electric circuit diagram 

ДЕМ-202С

Connector designation

Document designation

ХР1

XS1

Base as per EN 175301-803

Electric connector GDA4080S62 form А

EN175301-803

Figure 3 – Electric circuit diagram of differential pressure control switches ДЕМ-202С