Pressure sensors-relays comply with TU RB 200020142.025-2000.

Pressure sensors-relays comply with TU RB 200020142.025-2000.

Designed for use in monitoring, control and regulation systems for excess pressure (pressure) and vacuum pressure (thrust) of gas burner devices, domestic heating installations and in technological pipeline systems to control 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 limit of pressure setting (mbar)

4 - Sensor version:

N - for overpressure

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

The lid is made of transparent plastic.

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

General technical characteristics of pressure sensors and switches:

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

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

Degree of protection according to GOST 14254 - IP54

The amount of external leakage is 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. When installing the sensor differently, 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 facing up to avoid moisture and condensation getting inside the sensor (the recommended position is with the stuffing box facing down).

Electrical wires are connected to the sensor contacts using clamping screws. To connect 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 of no more than 300 VA (cos ? = 0.6) at a voltage of 220 V for alternating current circuits with a frequency of 50 Hz and 70 VA at a voltage of 24 V for direct current.

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Operating principle and scope of application of RD pressure sensors and switches

Operating principle of the RD sensor-relay(pressostat, alarm) is as follows: when the pressure value in the controlled system reaches a certain preset setpoint, the single-pole changeover contact (1SPDT *) switches and the relay is activated, closing or opening electrical circuit. At the moment when the pressure changes (falls) by the amount of the adjustable differential (ΔP), the relay automatically returns to its original position, therefore pressure switch sensors belong to the category of 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 sensor-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 application of the RD pressure switch: heat supply systems, ventilation, water supply, engineering industry, protection of various mechanisms, in particular, pressure switches are installed in pumping units to protect against dry running caused by a sharp decrease in pressure in the system. In RD compressors, the unit operates in automatic mode.
RD models are also widely used in air conditioning systems, refrigeration units, boiler rooms, boiler rooms, heating points, fire extinguishing systems, compressor rooms and other industrial, energy and housing and communal services facilities - 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 switch:
— Heat supply
— Water supply
- Ventilation
— Air conditioning
— Fire fighting

Additional equipment for sensors, relays and pressure alarms

Connection to the process (pressure supply to the device inlet):
Mounting fittings: selecting devices (OU): bosses, bends (including Perkins loops)
Impulse tubes (usually copper tube D=6,8,10mm for flaring (nut), soldering (nipple) or with fittings)).
Pressure gauge taps (up to 16/25 bar) or valves/valve blocks (over 2.5 MPa).
Adapters (steel, brass, stainless steel), dampers (hydraulic shock pulsation absorbers), coolers (radiators), membrane separators RM, connecting hoses mod-55004.
Set of mounting (KMCH) and connecting (KPC) parts.
At the outlet of the device:
Secondary devices and automation with relay inputs (controllers, regulators, etc.).
Electromagnetic (solenoid)* and shut-off and control valves KZR.
Installation cable and wires.

Permits and technical documentation

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

The detailed technical description and operating instructions contain the following sections:
— purpose, description and designation of types (brand, model);
— technical data (such characteristics: measurement range (setpoint settings) and permissible response error, etc.);
— device and operation (principle of operation, design, etc.);
— operating conditions, degree of protection and stability;
— installation, seals, storage conditions;
— indication of safety measures during installation and operation;
— conditions of storage, transportation, rules of installation, operation and dismantling;
— methodology for setting up and re-setting;
— Maintenance and repairs (malfunctions, causes, methods and solutions);
— packaging, labeling, transportation labeling;
— weight, overall and connecting dimensions;
— additional equipment, spare parts and accessories (SP&A).

*- Additional information, definitions, concepts and explanations

Switching capacity(switching wear resistance of contacts) relays are 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 operate reliably during the required 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 control key contacts is insufficient, the circuit remote control complemented by contactors - devices that are capable of switching significant currents.

Designation of relay contacts in the diagrams - 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: switching 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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GC Teplopribor - production and supply of instrumentation and automation: Sensors-relays/indicators of excess pressure and vacuum (pressostats), see technical description/characteristics, price list (wholesale price), how to order and buy inexpensive RD at manufacturer's price in stock or on order with warehouse in Moscow, delivery/shipment to TC (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 sensor-relays (alarms) of excess pressure (pressure) and vacuum (thrust): analogues, fakes and illiquid goods, deprived of proper service, guarantees, with shorter or expiring warranty periods, without additional options and complete set; therefore, possibly having a lower price than the original products.

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

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

If it is necessary to simultaneously monitor 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 alloys or oil- and petrol-resistant rubber. For the production of sensor membranes, rubberized fabric is used, which allows the membrane to withstand pressures of up to 1.5 bar. The housing cover is made of transparent plastic.

The sensor response pressure is set using a scale screw.

Electrical wires are connected to the DRD sensors with contact clamp screws.

1. DRD - series designation

3. Upper limit of pressure setting (mbar)

4. Sensor version

5. Sensor setting type:
A - to increase the measured pressure
B - to decrease the measured pressure

Technical data

Schematic diagram of pressure sensors-relays of the DRD series

DRD pressure switch sensors are connected to the system using threaded (G1/4) holes A and B. Moreover, if pressure is supplied through hole A, hole B is closed with plug 1 and vice versa.

It is recommended to install the sensor in a position where the diaphragm is vertical, since the sensor is factory configured for use in this position. If installed differently, the sensor will experience 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 permissible load current for pressure sensors-relays of the DRD series