Instrumentation specialist Impress Sensors & Systems Ltd has expanded its SQ range of mechanical pressure switches to include a high pressure series, which is adjustable between 50 and 100 bar.

The new SQ high range mechanical gauge pressure switches are available in three versions: the cost effective SQ275-RH1 zinc-plated SPDT (single pole, double throw) pressure switch; the SQ276-RH1 stainless steel SPDT version for media compatibility; and the SQ27U-RH1 brass SPDT pressure switch. All three switches are user-adjustable between 50 and 100 bar.

The switches are a cost effective, robust option for OEMS and end users across a diverse range of process control applications, including pressure control for piping systems, lubrication systems, hydraulics and pneumatics, air compressors, hydraulic detection for fire fighting systems, sprinkler systems, medical equipment, and tyre manufacturing.

The SQ range of mechanical pressure switches from Impress Sensors also includes a medium pressure series. With similar technical features to the high pressure range, these switches are available in zinc-plated, brass and stainless steel housings, with adjustable pressure ranges between 20 and 49 bar.

The SQ high range pressure switches have NBR diaphragms as standard, with Viton and EPDM diaphragms available as options. Electrical connection is made by simple spade terminals and the switches have a G1/4” male process connection.

SQ 76 series mechanical pressure switches

The switches can operate in temperatures from -10 deg C to +100 deg C. Response frequency is 2Hz and accuracy is +/- 5% FS.

Sam Drury, Sales & Marketing Director at Impress Sensors & Systems Ltd comments: “By introducing the high range SQ switches into our existing range of mechanical pressure switches, we can now offer customers robust, user-adjustable pressure switches from 5mbar up to 100 bar. Different housing materials, diaphragms and selectable contacts, allows us to cater for every customer’s needs, from harsh, media compatible environments through to simple low cost mechanical switches for non-process critical applications.”

For more information on the SQ range of mechanical pressure switches, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.

SQ27 – Impress expands mechanical pressure switches to include high pressure series is a post from: Impress Sensors

Pressure switches monitor pressure levels in an industrial system. If there is a change in pressure beyond normal levels, the switch will either send out an electrical signal or change the industrial process function. Pressure switches were created specifically to fulfill this very purpose.

Electromechanical pressure switches

Electromechanical pressure switches are snap action type switches. These pressure switches open or close according to changes in system pressure. If pressure is maintained at equilibrium then the switch will remain in the constant state.

Solid state pressure switches

The new types of pressure switches are called solid state pressure switches. This type of switch sometimes has an inbuilt display unit for the purpose of indication. And these switches have a very long lifespan as they contain no moving mechanical parts. They can in fact work efficiently for over one hundred million successive operations. They offer the highest accuracy rates and are not affected by external shocks or disturbance caused by vibrations. They have now found a wide range of uses in industrial applications.

A general information guide to industrial pressure switches is a post from: Impress Sensors

For charging different types of batteries, you can use pneumatic pressure switches. The role of pressure switch is to assist in regulating the rate of charge. Thus, they prevent the battery from receiving huge amount of current.

On the other hand, hydraulic pressure switches are also used in different ways. They are widely found on trucks and cars. Hydraulic pressure switches activate the warning light in case the oil pressure in the automobile drops below the stipulated level. Hydraulic pressure switches are also built into the brake system. They activate the brake lights if the pressure increases because of the driver depressing the brake. Pressure switches enable a person to activate and shut down air conditioning and air filtration systems according to the presence of different levels of pressure.

Pressure switches are also found in pool systems. They play an important role in regulating the temperature of the water. This enables pool users to enjoy pleasant temperatures in the summer months and a heated pool during the winter season. Pressure switches are available in a range of designs and sizes and these switches are quite safe to use.

Some pressure switch applications is a post from: Impress Sensors

When selecting a pressure switch for protecting equipment, products or operators, you should essentially consider deadband, set point and reliability. Pressure switches are generally used in plants across the globe for an extensive range of control, shutdown and alarm applications. They are economical means for protecting equipment and operators by sensing when the pressure drops down or rises up beyond safe levels.

Once the pressure rise or drop is determined, an electrical signal is then sent to control the equipment or to activate an alarm. Set point refers to a pressure level where the control function or alarm is set to occur. Generally, most pressure switches enable physical set-point changes in the field. However, some manufacturers also provide models with two different set points for both minimum and maximum pressure alarm applications.

On the other hand, a deadband is actually a difference between reset points and set points resulting from the inefficiencies in mechanical parts of the switches. While some pressure switches include deadband adjustments, others have non-adjustable, fixed deadbands. So, when it comes to selecting pressure switches you need to choose the one that can best suit your requirements.

Selecting the right pressure switches is very important is a post from: Impress Sensors

Hydraulic pressure switches:

Hydraulic pressure switches are used in many different ways. These types of pressure switches can be commonly found in trucks and cars. The hydraulic pressure switches activate the warning light if the vehicle’s oil pressure drops to a level that can possibly create problems for the engine.

The hydraulic pressure switches are also built into the braking system of the vehicle. When the driver depresses the brake pedal, the pressure rises and increases the pressure found in the hydraulic brake pipe. Other hydraulic pressure switches are used throughout different components, including air conditioning and air filtration systems.

Pneumatic pressure switches:

These types of pressure switches are extremely helpful in the appropriate charging of different batteries, particularly the designs that utilise a mixture of nickel with some other metal. Basically, the pneumatic pressure switches help to adjust the rate of charge, thus preventing the battery from receiving excesses of current.

The pneumatic pressure switches can also be used for adjusting the function of a gas compressor. In this type of application, pressure serves as the means for determining when to shut off the electric flow into the compressor. This greatly helps to prevent an overload situation.

Various types of pressure switches and their applications is a post from: Impress Sensors

DS Series Combined pressure transmitter, pressure switch and pressure display

The DS range of pressure transmitter, switch and display combination is a three-in-one multi-function pressure sensor with signal conditioning which gives a current or voltage output signal, 1, 2 or 4 x independent PNP transistor switch outputs and a freely scalable and programmable led rotatable display!  The potential for this device is a complete control system in a single device, cutting installation and equipment costs and configuration to your exact control requirements.

With pressure ranges spanning from 10mbar on the DS 210 through to 600 bar on the DS 200 within the DS series we should be able to cover all requirements on air pressure measurement and liquid pressure sensing alike.  The DS range will cover your requirements for an air pressure transmitter, oil pressure transmitter, hydraulic pressure transmitter and also if it’s just a simple pressure switch that you require then this device will solve that requirement also.

There are several options available within the range including:

1. ATEX certification
2. 1, 2 or 4 switch points
3. analogue output in either 4-20mA, voltage or none!
4. electrical connection
5. process connection type

There’s also the option for a 3-wire 4-20mA configuration which allows for re-calibration of the 4-20mA output signal, not only is the display scalable, the output is also!

The digital LED display on the device is freely rotatable through 2-axis so you will always be able to see the display clearly.  If installed on a vertical pipe horizontally then simply rotate the display through the body until it is face on and then rotate it on the display part so the readings are horizontal.  The brightness is also adjustable depending on the environment you are installing to.

The DS 210 – Air pressure sensor switch

Suitable for air pressure and non aggressive gases, the start of measurement is from as low as 10mbar through to 1000mbar Gauge reference only.  Vacuum pressure ranges also available.

The DS 201 – Ceramic pressure sensor switch and display

Suitable for Gases and Liquids from pressure ranges from 600mbar through to 600 bar Gauge or Absolute reference making this suitable for gauge pressure sensor, absolute pressure sensor requirements and absolute pressure switch applications also.

The DS 200 – Stainless steel pressure sensor switch and display

Suitable for Gases and Liquids compatible with the stainless steel media isolated diaphragm.  Pressure ranges from 100mbar through to 600 bar Gauge or Absolute reference, being based on a silicon pressure sensor with stainless steel diaphragm the over pressure capability is inherently higher and also the resolution is higher than the DS 201 with the ceramic pressure sensor.

The DS 230 – OEM Digital pressure switch with display

Suitable for Gases and Liquids compatible with the ceramic diaphragm and FKM internal O-ring seal.  Pressure ranges from 2 bar through to 400 bar Gauge reference only.  This is a lower cost version with less accuracy and no transmission of output, just purely a pressure switch and pressure display device targeted at OEM applications.

The DS series pressure transmitters, switches and display products are very diverse in their capabilities as a control device, please contact sales for a discussion on to how best implement the pressure product into your application.

Product Datasheet: DS 210, DS 201, DS 200, DS230

Product Page: Combined Pressure Transmitter, Pressure Switch and Display products page

If you have any applications you wish to discuss or any questions questions regarding this product then please contact sales here sales@impress-sensors.co.uk

DS Series combined pressure transmitter, pressure switch & display! is a post from: Impress Sensors

901 ATEX Pressure Switches

A range of compact, low cost pressure switches are now available that are ATEX-certified for use in Zone 0, Zone 1 and Zone 2 gaseous atmospheres.

The new 901 range of ATEX-certified pressure switches, from Aldermaston-based sensor specialist Impress Sensors, are ideal for monitoring overpressure, vacuum or differential pressure of both liquid and gaseous substances, including aggressive media, in hazardous environments. The switches can be used to monitor fluid levels and filters, as well as excessive or inadequate pressure and pressure differentials in closed systems.

The explosion-proof pressure switches are ideal for a range of explosive atmosphere environments, including nuclear, oil and gas, chemicals, pharmaceuticals, sewerage and food processing.

The switches are available in a factory-set version, in which the pressure setting and switching differential are set by the manufacturer, or an adjustable version, the 901 Prescal, where the customer uses a scaled adjustment knob to alter the trip and reset pressure, without having to use a screwdriver.

A wide range of switch options are available, including pressure connections in various materials, shapes and sizes. Customers can also select from a diverse range of materials for seals and diaphragms. All switches are intrinsically safe and have been categorised as Temperature Class T4 and Explosion Group IIB or IIC.

Sam Drury, Sales Director at Impress Sensors & Systems comments: “Some of our customers need to monitor pressures in potentially explosive atmospheres. In the chemicals sector, for example, air mixtures and ignitable gases are commonplace and can cause explosions if a source of ignition is present. Therefore, industrial instrumentation devices such as pressure switches need to be protected accordingly. We are delighted to be able to offer these ATEX-certified sensors to the UK.”

The factory-set 901 switch can be set according to the customer’s specification at a fixed value between 5mbar and 12bar in the positive pressure range and between –5mbar and –900mbar in the negative pressure range. With the 901 Prescal switch, the switching pressure can be controlled using an adjustment knob.

For pressurized connection, there is a choice of plastic or metal hose connectors or threaded couplings.

Product Datasheet: 901 Prescal ATEX Pressure Switch, 901 fixed range ATEX Pressure Switch

Product Page:  Pressure Switches product page

If you have any applications you wish to discuss or any questions questions regarding this product then please contact sales here sales@impress-sensors.co.uk

ATEX Pressure switch, fixed pressure range or adjustable! is a post from: Impress Sensors