Differential & Room Pressure Monitoring


Room pressure monitoring sensor system

There are many applications, which required a controlled room pressure. In all such cases, we need room pressure monitoring systems for continuously checking the pressure. This can be absolute pressure monitoring or relative pressure monitoring. In the case of absolute pressure monitoring, the customer needs to maintain a particular pressure value. In certain other applications, we require relative pressure difference. Relative pressure will be either positive pressure or negative pressure in relation to the pressure immediately outside this room.

Room pressure monitoring systems with pressure sensors

In all pressure monitoring systems, the system has to measure the pressure of the air. For this purpose, there will be a small opening in the unit, which is open to the air. There will be a membrane as part of the pressure sensor, which measures the air pressure. For measuring the absolute pressure, we will need only one such pressure sensing diaphragm. However, for a negative or pressure monitoring, we will require a system with two sensors. We are measuring the negative or positive pressure with respect to the pressure outside the room. Hence, the system needs to measure the pressure inside the room as well as outside the room.


Negative pressure sensor monitoring system

Negative pressure monitoring sensor system

As an example, an isolation ward in a hospital will be a negative pressure room. The pressure is always slightly lower than the outside areas. In this case, the bacteria inside the room will not go to the outside of the room. As the pressure is always negative, there will be a tendency for outside air to enter into this room, but not vice versa. Hence, the contaminated air from the patient room will not go outside this room. Our control panel will constantly show the pressure difference between the rooms. In case the pressure difference reduces, the system will generate an alert. It is possible to connect different alert systems such as phone call, SMS alerts or a local siren with flashing light. In both the case of negative and positive pressure systems, the pressure sensors are the same. It is only the difference in configuration of the pressure values. As these sensors are for monitoring difference in pressure, technically these are the differential pressure monitoring system.

Positive pressure monitoring sensors

An example of a positive pressure room will be Central Sterile Supply Department (CSSD) in a hospital. This room


Positive Pressure Sensor Monitoring System

contains sterile items in a hospital. Contaminated air from other areas should not enter this room. Hence, this room has a slightly higher pressure than the outside. The air inside the CSSD room may go out of the room, but not vice versa. In case the air pressure inside the CSSD room becomes equal to the outside air pressure, it is an alarm condition. Our system will immediately make a phone call, SMS, and local alarms. Eg. If the pressure in the corridor is 101 kPa, the CSSD room will be at 105 kPA. In case the pressure of the CSSD room comes down to 102 kPA, the system will generate an alert.

Differential Room Pressure recording connected to BMS

We can connect our differential room pressure monitoring system to a central recording system. If you want to record only pressure separately it is possible. If you have many such rooms, we can centralize all the data and store on a cloud-based server. Also, we can connect our differential pressure sensors to automation systems through Modbus, BACnet etc. We can also connect to your existing BMS but may require modifications to the existing systems. Our automation team will be able to assist you in this regard.


Room pressure recording system

Negative and positive pressure monitoring with phone, SMS, Siren alert

Our differential monitoring system has audiovisual alerts on the control panel itself. In the case of an alert, there is a local beep and the screen will flash red. Apart from this, we can connect a SIM card based phone call alert system. This phone dialer system will generate calls to 4 operators and send SMS also simultaneously. It can deliver a custom-recorded voice message such as ‘pressure is low in CSSD room 2’. The system will call the operators one by one until anyone picks the call. All the people will receive SMS alerts simultaneously.

Isolation room monitoring and alert

The same system is useful for isolation rooms in hospitals. It is mandatory to keep the negative pressure inside an isolation ward. This means that the pressure in this room should be lower than that of outside rooms, corridors etc. This will prevent infected air from entering into other areas. In order to monitor this, you can use our system. One pressure sensor will be inside the isolation room and the other will be outside the room. The system will continuously check that the pressure inside the room is always at a negative pressure. Otherwise, the system can provide alerts as programmed.

Pressure sensor for operation theatre in hospitals

Similar to isolation wards, operation theatres also require a differential pressure. Operation theatre will have a slightly positive pressure. This is to ensure that when the patient is vulnerable to infections, outside air should not contaminate the air inside the operation theatre. So our pressure monitoring system will have one sensor inside the operation theatre. The second sensor will be outside of the operation theatre. The monitor will continuously check that the operation theatre is always at a higher pressure compared to the outside.

Pressure sensor for Airborne infection isolation (AII) rooms

Airborne Infection isolation wards require differential pressure sensors systems. These rooms are at a negative pressure so that contaminated air does not go out of the room. This will cause fast spreading of the disease across the hospital. Hence it is very important that the pressure of this room is monitored.

Pressure sensor for CSSD room in hospitals

Central Sterile Supply Department (CSSD room) or sterile processing department (SPD) are special rooms in hospitals for cleaning, disinfection, sterilization etc. These rooms are maintained at a slightly higher pressure than the surrounding rooms. The purpose is that outside air should not enter into CSSD room, which can cause contamination. During the sterilization process or after the sterilization, disinfection fo air is done through a disinfection unit fitted in the HVAC systems.

Pressure sensors for Pathology and histology laboratories

The Pathology and histology laboratories in hospitals use different types of chemicals. In order to avoid spreading of these chemical particles, these rooms are normally at a negative pressure. Inorder to ensure the differential pressure, one pressure sensor is fitted inside the laboratory and the second one outside the room.

Pressure sensor for Absolute pressure

The absolute pressure means the exact reading of the pressure in terms of kPA or similar measuring units. Differential pressure means the difference between two pressure points. In the case of an operation room, there are two sensors. One is inside the room and the second one is outside the room. Both these sensors are connected to our monitoring system. The unit will be checking whether the operation theatre is always at a higher pressure. The exact pressure reading is generally not important in this case. However, there are applications in which you will want to know the exact reading. As an example, if the building is at a high altitude, you will want to know the exact atmospheric pressure. If there is a gas pipe outlet, you may want to regulate the pressure. You will need an absolute pressure sensor for this purpose.

Price of differential pressure monitoring systems

Our simplest room pressure monitoring system consisting of one sensor and receiver starts from US$ 1,220.00 (Taxes and Duties in your country will be extra). It is very easy to install by any technician with simple instructions. We are supplying the same in programmed conditions. Hence your technician need not worry about additional programming.