Pressure switches comply with TU RB 200020142.025-2000.

Pressure switches comply with TU RB 200020142.025-2000.

Designed for use in systems for monitoring, controlling and regulating excess pressure (pressure) and vacuum pressure (thrust) of gas burners, domestic heating installations and in technological pipeline systems for controlling the flow of natural, liquefied gas, air and other gaseous non-aggressive media.

Designation structure:

DRD - X X X

1 - DRD - series designation

3 - Upper pressure setting limit (mbar)

4 - Sensor version:

H - for excess pressure

T - for vacuum pressure

5 - Sensor setting type (except for DRD-...T):

A - to increase the measured pressure

B - to decrease the measured pressure

The body parts of the sensor are made of corrosion-resistant materials (non-ferrous metal alloys, high-strength plastic, oil and petrol resistant rubber). The sensor membrane is made of rubberized fabric and withstands pressure up to 1.5 bar.

The cover is made of transparent plastic.

The set pressure value is set using a screw with a scale. Electrical wires are connected with contact clamping screws.

General technical characteristics of pressure switches:

Climatic version - U3.1 (-30...+60°С).

Working environment temperature - -30°С...+60°С

Degree of protection according to GOST 14254 - IP54

The value of external leakage - no more than 20 cm3 / h

The resource of inclusions is at least 9 years.

It is preferable to install the sensor in a position where the membrane is in a vertical position. With a different installation of the sensor, errors occur due to the influence of the mass of moving parts, which requires additional adjustment. It is also not recommended to place the sensor with the stuffing box up to prevent moisture and condensate from getting inside the sensor (the recommended position is with the stuffing box down).

Electrical wires are connected to the sensor contacts using clamping screws. For connection of wires it is recommended to use fork lugs in accordance with GOST 22002.3.

The design of the sensor allows the use of a cable with a diameter of no more than 10 mm.

Sensor-relays are designed for switching power not more than 300 VA (cos ?=0.6) at a voltage of 220 V for AC circuits with a frequency of 50 Hz and 70 VA at a voltage of 24 V for DC.

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The principle of operation and scope of sensors-pressure switches RD

The principle of operation of the sensor-relay RD(pressure switch, signaling device) is as follows: when the pressure value in the controlled system reaches a certain setpoint, set in advance, a single-pole changeover contact (1SPDT *) is switched, and the relay is activated, closing or opening electrical circuit. At the moment when the pressure changes (falls) by the value of the adjustable differential (ΔP), the relay automatically returns to its original position, so pressure switches are classified as automatic devices.

The versatility of the pressure switch lies in the ability to work both with increasing and decreasing pressure.
The design of many RD sensors-relays and their switching capacity* allows them to be used directly when controlling pumps or other actuators without additional devices (intermediate relays, contact relief devices, etc.).

Scope of pressure switch RD: heating, ventilation, water supply systems, engineering industry, protection of various mechanisms, in particular, pressure switches are installed in pumping units to protect against dry running caused by a sudden drop in pressure in the system. In RD compressors, the unit operates in automatic mode.
RD models have also been widely used in air conditioning systems, refrigeration units, boiler rooms, boiler houses, heat points, fire extinguishing systems, compressor and other industrial facilities, energy and housing and communal services - housing and communal services, where reliable and accurate on-off relay control of a given pressure threshold is required.

The main areas of application of the RD pressure indicator:
— Heat supply
– Water supply
- Ventilation
— Air conditioning
— Firefighting

Additional equipment for sensors-relays and pressure alarms

Process connection (pressure supply to instrument inlet):
Mounting fittings: selective devices (OU): bosses, bends (including Perkins loops)
Impulse tubes (usually copper tube D=6,8,10mm for flaring (nut), soldering (nipple) or with fittings)).
Gauge taps (up to 16/25bar) or valves/valve blocks (over 2.5MPa).
Adapters (steel, brass, stainless steel), dampers (absorbers of water hammer pulsations), coolers (radiators), membrane separators RM, connecting sleeves mod-55004.
Set of mounting (KMCH) and connecting (KPCH) parts.
At the outlet of the device:
Secondary devices and automation with relay inputs (controllers, regulators, etc.).
Solenoid valves (solenoid)* and shut-off and control valves KZR.
Cable and wires mounting.

Permits and technical documentation

At the request of the consumer, an order card (form) (questionnaire), a certificate, permissions for use, a product passport, technical description and operating manual, description of the type and setting method, as well as other permits and technical documentation.

A detailed technical description and operation manual contains the following sections:
- purpose, description and designation of types (brand, model);
- technical data (such characteristics: measurement range (setpoint settings) and permissible error for operation, etc.);
- device and operation (principle of operation, design, etc.);
— operating conditions, degrees of protection and stability;
— installation, sealing, storage conditions;
- indication of safety measures during installation and operation;
- conditions of storage, transportation, rules for installation, operation and dismantling;
- tuning and reconfiguration technique;
— Maintenance and repair (faults, causes, methods and remedies);
– packaging, labeling, transportation labeling;
- weight, overall and connecting dimensions;
— additional equipment, spare parts and accessories (spare parts).

*- Additional information, definitions, concepts and explanations

switching capacity(switching wear resistance of contacts) the relay is characterized by the value of the power they switch, at which the contacts perform a certain number of switchings.
Switching capacity of contacts, i.e. the conditions under which the contacts reliably operate during the prescribed service life depend, firstly, on the properties of the switched circuit, secondly, on the duration of the passage of current through the contact, and, thirdly, on the switching speed.
In cases where the switching capacity of the contacts of the control key is insufficient, the circuit remote control supplemented by contactors - devices that are capable of switching significant currents.

The designation of the relay contacts on the diagrams is SPST and SPDT:
On the diagrams and on the relay housings, you can find American and English designations for contacts of the following type:
SPST - single pole, single throw: normally closed (SPST-NC or A form contact) or normally open (SPST-NO or B form contact) contact;
SPDT - single pole, double throw: changeover contact (SPDT-C/0 or C-form contact).

Electromagnetic (solenoid) valve- an electromechanical device designed to regulate the flow of all types of liquids and gases. Such a valve consists of a body, a solenoid (electromagnet) with a core, on which a disk or piston is installed that regulates the flow.

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GK Teplopribor - production and supply of instrumentation and automation: Sensors-relays / signaling devices for overpressure and vacuum (pressure switches), see technical description / characteristics, price list (wholesale price), how to order and buy inexpensive RD at the manufacturer's price in stock or on order from warehouse in Moscow, delivery/shipment of shopping malls (Business Lines and others) throughout the Russian Federation.

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ATTENTION! Be careful when choosing a supplier - on Russian market pressure control devices, there are cheap low-quality copies of sensors-relays (signaling devices) of excess pressure (pressure) and vacuum (thrust): analogues, fakes and illiquid assets, deprived of proper service, guarantees, with shorter or expiring warranty periods, without additional options and complete set; therefore possibly having a lower price than original products.

Pressure switches DRD are produced to ensure control and regulation of excess pressure (pressure) of air or gas in ventilation and gas supply systems. DRD monitor the pressure indicator and, if the set values ​​are reached, send appropriate signals to the automation and control system.

Sensors of the DRD series are designed for installation in control systems of industrial and domestic heating installations, gas burners, as well as in technological pipeline systems. DRD sensors provide flow control of liquefied or natural gas, air or other gaseous non-aggressive media.

If it is necessary to simultaneously control several parameters (for example, upper and lower pressure limits), the sensors can be connected into blocks.

Housing parts for the DRD sensor are made of corrosion-resistant materials: high-strength plastic, non-ferrous metal alloys or oil and petrol resistant rubber. For the production of sensor membranes, rubberized fabric is used, which allows the membrane to withstand pressures up to 1.5 bar. The housing cover is made of transparent plastic.

The value of the sensor response pressure is set using a screw with a scale.

Electric wires are attached to the DRD sensors with contact clamping screws.

1. DRD - series designation

3. Upper limit of pressure set point (mbar)

4. Sensor version

5. Type of sensor setting:
A - to increase the measured pressure
B - to decrease the measured pressure

Technical data

Schematic diagram of pressure switches of the DRD series

Pressure switches DRD are connected to the system using threaded (G1 / 4) holes A and B. In this case, if pressure is supplied through hole A, hole B is closed with plug 1 and vice versa.

It is recommended to mount the sensor in a position where the diaphragm is vertical, as the sensor is factory set to operate in this position. In the case of a different installation, the sensor has errors due to the influence of the mass of moving parts, which will require additional adjustment of the sensor using a reference pressure gauge.

Maximum allowable load current for pressure switches of the DRD series