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Room Pressure Monitors
Isolation Room Equipment
Room Pressure Sensor for Patient Care Areas
Negative Pressure Rooms Positive Pressure Rooms

   ACCUSTAT®, P1 & BMS  
Monitors negative or positive pressure
Meets CDC guidelines
Accurate to .001" WG
User alarm setting
One minute delay
Status LED's
Room Pressure Sensor

ACCUSTAT® Room Pressure Monitor & ACCUSTAT® P1(portable)

Room Pressure Monitors
Negative & Positive Pressure Rooms
Isolation Room Equipment
Room Pressure Monitor
Negative Pressure Room
Positive Pressure Room
Isolation Room Equipment

Stationary Model
The ACCUSTAT® room pressure monitor is designed specifically for monitoring low, negative or positive
pressure differentials. Accurate pressurization is a
vital step in creating a compliant, controlled and safe environment. Ideally suited for monitoring negative
pressure in hospital isolation rooms, or pressure
differentials in other critical applications and environ-
ments where pressure monitoring is critical. The ACCUSTAT® is a pressure sensor. It is sensing through pressure the static differential between the two referenced spaces.

State-of-the-art microprocessor design operates from
a single positive supply power source. Temperature compensation provides for consistent predictable per- formance within specified temperature ranges. Pressure monitor readings are instantaneous and accurate with many optional features to allow for custom-designed installations.

State-of-the-Art Solid-State Circuitry
Room Pressure Monitor
Negative & Positive Pressure Rooms Isolation Room Equipment

ACCUSTAT® Printed Circuit Board

A large, lighted digital display readout identifies instantaneous subfractional pressure changes
when compared to the adjoining areas. Pressure
readings are accurate to within .001" WG with
audio and visual alarms identifying unsatisfactory conditions.

The ACCUSTAT® utilizes a highly sensitive pressure transducer eliminating the varying inconsistencies of "airflow" monitors. Air pressure tends to be more
consistent and less corrupted by airflow direction disruption, thereby reducing the frequency of false
alarms and inconsistency.

ACCUSTAT® Wallplate Stainless steel, wall-mounted
probe plate secures probe tube for thru-wall monitoring.

In-Room Probe Plate

ACCUSTAT® P1 (Portable)
Portable Room Pressure Monitor
Negative & Positive Pressure Rooms
Isolation Room Equipment

Portable Room Pressure Monitor

When monitoring individual rooms in multiple locations, the ACCUSTAT® P-l offers user flexibility. The circuitry
is identical to the stationary ACCUSTAT® except for the addition of built-in rechargeable battery component. The unit can be powered from a standard 115V electrical outlet
or by the 8-10 hour nicad battery. The case is durable stainless steel with a vinyl coated fold-down handle. It weighs less than five pounds and includes an extended flexible probe tube. The P1 is a welcome resource to con-
firm pressurization anywhere when portability is the issue. A valuable piece of isolation room equipment. Pressure sensor meeting CDC guidelines for patient care areas.

ACCUSTAT® Room Pressure Monitors Pricing
AC-022    ACCUSTAT® (Stationary Model) (Includes transformer & stainless steel wall plate to secure probe
ACP-022    ACCUSTAT® (Portable Model)
(Includes battery charger and
probe tube)…$1070.00
(Interfaces with Building Management System)
(Includes S/S wall plate &
probe tube)…$945.00

Pricing: FOB factory
Delivery: Stock
Pricing Subject to change without notice

Late Update: 12/13/06


There are two remote monitoring possibilities with the ACCUSTAT®: A direct interface with the building management system (ACCUSTAT® BMS) or a localized remote module.

The BMS is a built-in module to allow transmission of a 4-20 mA analog output. This can be tied into a BAS/EMCS system. An alarm contact is also provided by the monitor  for visual or audible remote annunciation. The time-delayed audible alarm feature is activated after a one minute time expiration.

Isolation Room Pressure Monitors
Negative Pressure Rooms
Positive Pressure Rooms Equipment

Remote Monitoring Panel

This option allows the status of up to six rooms to be individually monitored from a single monitoring station. The stainless steel panel contains six red and green status LEDs, which conform to the status of the individual stationary ACCUSTAT®'s monitoring the rooms. An audible alarm signal with mute feature and bi-color LED for visual references identify any room in non-compliance. Additional mute switches can be included to disable indications for individual rooms in the event the room isn't being utilized to monitor negative pressure.

Getting to know
room pressure monitors for negative & positive pressure rooms.

With various products available, deciding on the correct isolation room pressure monitoring equipment for your application is an important decision to make only once. As a result it will save you time, aggravation and money later. It can be easier to make that decision when all the important facts are addressed. It’s a decision you want to make once and not be remind every time there is a staff complaint or malfunction.

Some companies claim to offer a “pressure room differential monitor” when in actuality it is instead an “air flow monitor.”  An instrument where the probe head measures “flow direction” is an airflow monitor. They reference the flow rate and extrapolate from that a pressure reading. Flow rate to pressure reading, can something get lost in the translation? You bet, especially when the probe head gets clogged with the buildup of airborne particles constantly passing over it. That alters the flow rate in both directions. When the flow rate changes so do the calculations and the result is a false alarm, even if the room pressure is compliant, but the device doesn't know that.

Periodic cleaning and adjustments are in order. Since many rooms can just barely maintain negativity the slightest variance in pressure even caused by negative pressure room users and maintenance personnel who have to contend with irrelevant alarms.

The ACCUSTAT® Room Pressure Monitor by comparison is a true room pressure monitoring device. Airflow isn't measured, only differential air pressure. The quality of the air is irrelevant because nothing passes through or over the probe, so nothing needs to be cleaned, adjusted or replaced. Particles of dust don't influence our room pressure readings. Forgetting to clean the probe doesn't produce false alarms. Blocking or a sudden stream of air across the probe head doesn't alter the readings with the ACCUSTAT®, because that shouldn't alter the pressure.

The ACCUSTAT® maintains accurate consistent readings and does not degradate with use. The ACCUSTAT®’s consistent monitoring to .001” WG is compliant with current CDC guidelines for isolation room monitoring. The minute delay, keyed on/off, lighted numeric display, muting, remote, colored LED and many more features are part of the ACCUSTAT® package. You can be guaranteed years of trouble-free operation. Thousands of ACCUSTAT®S Room Pressure Monitors are in operation worldwide, some for as long as 14 years, and are still providing accurate monitoring of negative and positive isolation rooms for the safety and security of health care facilities and their staffs. It was an accurate decision then and the right decision now.


Product Details (click link): Room Pressure Monitor for Negative Pressure Rooms and Positive Pressure Rooms
  Installation Instructions
ACCUSTAT® P1 Portable Room Pressure Monitor
ACCUSTAT® Pressure Differential Monitor
Manual ACCUSTAT® Negative Pressure Rooms
Model Numbers Negative & Positive Pressure Rooms
Submittal Drawing
Stationary & P1 Room Pressure Monitors

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Isolation Room Equipment/Room Pressure Monitors/Negative Room Pressure and Positive Room Pressure/Pressure Sensor
The CDC Guidelines require that Isolation rooms occupied by TB patients have differential pressure monitored daily by a differential pressure measuring device. The Biological Controls’ ACCUSTAT® is a room pressure monitoring device that measures differential pressure between a controlled space and a referenced space. Pressure measurement for a variable volume air supply and exhaust systems is critical for the conservation of energy and the air purification system, as well.

US Center for Disease Control over a decade ago has required hospitals and health care facilities to house patients with infections which potentially could spread through the air in negative pressure rooms. Hospitals and all other health related organizations require positive pressure for surgical suites and areas with immune-compromised patients to limit the chances of airborne infection spreading through the facility. Biological Controls ACCUSTAT® Room Pressure Monitor accurately measures the actual room pressure differential, verifying the proper operation of your HVAC or your air purification system to help you maintain patient safety.

CDC Guidelines were established and requirements so that a successful project to develop a new Isolation Room in any institution should include early involvement of the nursing staff who will manage the room, the Infection Control Department, and the maintenance staff as well as the architect who will design the space. In many cases hospital and health care facilities convert and existing room into an isolation room, within the facilities as the need arises. Thus creating the need for a Room Pressure Monitor for negative and positive pressure, Hospital Isolation Room Equipment.

Important Engineering Features for Negative Pressure Rooms and
Positive Pressure Rooms:
The room airflow should be a minimum of 12 air changes per hour. The CDC Guidelines do not specify if the airflow or exhaust airflow should equal 12 air changes per hour, but making the supply airflow equal to 12 air changes per hour is the most conservative approach. They do specify that the exhaust airflow volume should exceed the supply airflow volume by 10% or 50 CFM, whichever is greater, to maintain a negative pressure within the room with respect to surrounding areas. The negative pressure will cause an inward flow of air into the Isolation Room when the doors are opened, preventing the migration of airborne pathogens to the surrounding areas. The effectiveness of the 12 air changes standard has not been proven with regard to minimizing TB bacteria in a room; however, actual experiments have proven that increasing airflow rates in hospitals does show a reduction in total bacteria counts in the air.

The ACCUSTAT® pressure sensor, sensing through pressure the static differential between the two referenced spaces. If variable volume is used, it is imperative that accurate, reliable controls be used to sense the pressure differential between the patient room and the surroundings and adjust the air purification/ exhaust system to maintain the desired pressure differential. The CDC Guidelines specify a minimum pressure differential of 0.001 inches w.g. (water gauge). Which can be accomplished utilizing the ACCUSTAT® Room Pressure Monitor.

ACCUSTAT® Room Pressure Sensor is CDC compliant in providing a visible and/or audible alarm when low air pressure is sensed, while incorporating a time delay, to allow persons to enter or leave the room without activating the signal. If an anteroom is provided with the Isolation Room, the guidelines require that the Isolation Room be maintained at negative pressure with respect to the anteroom. The pressure relationship between the anteroom and the corridor is that the anteroom should be slightly negative to the corridor and is measured utilizing a probe tube.

The Isolation Room should be well sealed from the surroundings to help maintain the pressure differentials. Penetrations through walls must be sealed and drywall ceiling should be used or drop ceiling tiles that are impervious to air. Swinging doors are easier than sliding doors.

Aspergillus Control (MOLD)
While the Joint Commission on Accreditation of Healthcare Organizations (JCAHO) has long required the operation and maintenance of building systems to address infection control issues, an increased national focus on patient safety has recently prompted it to add more specific requirements to the Environment of Care, EC.1.9

Specifically, beginning January 1, 2001, the utility systems management program must “reduce the potential for organized-acquired illness,” and maintain “appropriate pressure relationship, air exchange rates, and filtration efficiencies for ventilation systems serving areas specifically designed to control airborne contaminants,” such as dust and biological agents. JCAHO will focus additional attention on precautions taken to protect high risk patients. Subsequently more health care facilities and hospitals will find greater need to create negative air pressure Isolation Rooms and the need to monitor room pressure. Biological Controls Room Pressure Monitors Sensor Isolation Room Equipment comes with a complete two year warranty and customer support.

Despite the risk analysis, however, always ensure that proper air pressure relationships in an area with high risk patients. Develop protocols to ensure that proper ventilation rates are maintained annually.

Limiting the spread of disease through a health care facility, patients suspected of having diseases will spread through the air and must be placed in negative pressure rooms, airborne infection Isolation Rooms. Similarly, immune-compromised patients at risk of contracting diseases should stay in positive pressure, protective environment rooms. Biological Controls' room pressure monitors continuously controls room pressure, by monitoring differential to comply with standards from the CDC Centers for Disease Control and AIA American Institute of Architects.

Features and Benefits of ACCUSTAT® Room Pressure Monitor for
Negative & Positive Pressure Rooms

• Creates a complaint, controlled and safe environment
• Highly sensitive pressure transducer eliminating the varying inconsistencies of “airflow”
• CDC Complaint providing visual, audible and alarm signals
• Large lighted digital readout identifies subfractional pressure changes within .001” WG
• Continuously measurements monitoring of actual room pressure differential
• Temperature compensation for consistent performance within specified temperature ranges
• Three models Stationary, Business Management System and Portable (multiple locations)
• Portable Unit preferred by facilities using mobile equipment (Click here for MICROCON® The Mobile    Hospital Air Purification System) room to room set up temporary or short term negative or positive    pressure environments. (Click here for Isoport our Portable Isolation Room Enclosure)
• Remote Monitoring up to six rooms
• Pressure sensor sensing through pressure the static differential between the two referenced    spaces.

Room Pressure Monitors for Clean Rooms
Most significant concern is contamination control and is of utmost importance in a clean room. High air change rates and laminar airflow are two of the methods used to keep impurities away from crucial yield. Measures can become ineffective if the clean room pressure differential should go negative, sucking in contaminants. ACCUSTAT® clean room pressure monitors sensor constantly measure the room pressure differential, signaling if the space goes negative so appropriate action can be taken.

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