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Blood Pressure Units

Blood Pressure Units

A blood pressure unit is used to determine the pressure inside the blood vessels of a patient.  There are two numbers that are important when taking a patient’s blood pressure, they are the systolic and diastolic pressures.  The systolic pressure is higher than the diastolic in a healthy adult and it corresponds to when the heart contracts.  While the diastolic number corresponds to when the heart is relaxed between beats.  Blood pressure readings are read as a fraction in a way for example 120/80 or 120 over 80 and readings can be classified as either low, normal, or high.  A person with low blood pressure has a blood pressure lower than 90/60 and the only real risk associated with this being that the patient may feel light headed or faint if it gets too low.  Normal blood pressure is any reading that is higher than 90/60 and lower than 140/90.  High blood pressure is any reading higher than 140/90 there are many health risks associated with high blood pressure and any patient with a blood pressure on the high side should consider changing their lifestyle.
How it works

There are two different types of blood pressure units either an automatic or a manual but they both work on the same principle.  First, the cuff is wrapped around the patients arm then the cuff is inflated to a point where it cuts off flow.  Next, the pressure in the cuff is slowly deflated until vibrations or Korotkoff sounds are heard.  When the sounds are first heard this is the systolic pressure of the patient and when the sounds stop this is the diastolic pressure.


Preventative Maintenance

The preventative maintenance of a blood pressure unit consists of, if applicable, an electrical safety inspection followed by a physical inspection of the unit and all accessories.  Next the blood pressure unit is tested for accuracy at different blood pressures and the system is tested for leaks.  Finally, the battery is checked to ensure that it has been changed within the past 2 years.  This is done for 2 reasons the first being so the battery does not corrode and damage the inside electronics.  The second reason being, so there is a functional battery in case of an emergency.

Common Errors

Electrical safetyElectrical safety failures are failures found during electrical safety testing and can potentially pose a risk to the patient.  This may be a high leakage current, ground wire resistance or too high of an operating current.

Damaged cuff or air hoseA damaged blood pressure cuff or air hose is common especially in a device that is highly used and this is because the Velcro gets worn to a point where it will not hold properly. Blood pressure units also develop leaks over time in the cuff itself or in any of the connectors used to interface the cuff with the air hose.  These failures can result in an error or false readings.

Internal Malfunctions – An internal malfunction of a blood pressure unit typically is one of 3 things.  First, the motor on the unit may fail; this will cause the cuff to not inflate fast enough or at all.  Second, is the pressure transducer which is responsible for reading the pressure inside the circuitry and detecting the vibrations of the patient’s blood pressure. The final internal error that can occur is an internal leak which may give the same errors and false readings as a leaky cuff.

Calibration failure – If a unit will not calibrate when attempted it can be caused by a main board failure, pressure transducer failure or because of a leak in the system.  When any of these typically the unit will need to be further assessed to determine exactly what is the cause.


How to get an accurate measurement

  • Allow the patient to rest for 5 minutes or more with their arm at heart level and their feet flat on the floor.
  • Find the right cuff for the patient as there are multiple sizes for patients with different size arms (If the patient fits in 2 cuff sizes pick the smaller of the 2).
  • Wrap the cuff around the arm with the artery marker in line with the patient’s brachial artery so you can comfortably fit one finger under the cuff.
  • Inflate the cuff and instruct the patient to no talk or make any sudden movements as this can mimic Korotkoff sounds and give false reading.
  • If more even more accurate readings are desired repeat the process on both arms and average the total.

The TRH Value

The added valve of choosing TRH Services to complete your maintenance and repairs on your blood pressure units is that we will ensure that your device will be in great working condition for you and your patients for the next year and it will be fully certified.  At TRH Services our expertise can help educate you on your blood pressure systems and make sure that your unit is in top performance. We can provide onsite service to your facility if you are located in South-Western Ontario (London, Toronto, Kitchener, Waterloo, Cambridge, Guelph, Hamilton, etc.).


Common Blood Pressure Units

Listed below is a short list of some common blood pressure units that we work on, a regular basses:

Manufacturer Model Number
A&D Engineering Inc. UA-779
A&D Engineering Inc. UB-521
A&D Engineering Inc. UA-787
A&D Engineering Inc. UA-774
A&D Engineering Inc. UA-767PC
A&D Engineering Inc. UA-767 Plus
A&D Engineering Inc. UA-767
A&D Engineering Inc. UA-705
A&D Engineering Inc. UA-704
A&D Engineering Inc. UA-702
A&D Engineering Inc. UA-631V
A&D Engineering Inc. UA-1020CN
A&D Engineering Inc. 5534
A&D Engineering Inc. UA-789
Actus Hand Held
Almedic Nova
Almedic Hand Held
Almedica Ag Hand Held
ALPK2 Hand Held
Amber Spa N/A
American Diagnostic Corp. (ADC) 6013
American Diagnostic Corp. (ADC) 6023
American Diagnostic Corp. (ADC) Hand Held
American Diagnostic Corp. (ADC) 6021
AMG Medical Inc Professional Series
AMG Medical Inc Hand Held
AMG Medical Inc 106-960
AMG Medical Inc 106-955
AMG Medical Inc 106-950
AMG Medical Inc 106-945
AMG Medical Inc 106-940
AMG Medical Inc 106-920
Barrington Diagnostics Hand Held
Barrington Diagnostics Floor Model
BMS 12-525
BMS Hand Held
Body Check Hand Held
BpTRU Medical Devices BPM-200
Briggs Healthcare 04-620-001
BV Medical Standard Hand Held
Chattanooga Group Pressure Feedback
CK CK-101
E.R.P LTD. MS-001
Healthmate Hand Held
Heine Germany Wall
Heine Germany Hand Held
Heine Germany Gamma G7
Heine Germany Gamma XXL Wall Mount
Heine Germany Gamma G5
Heine Germany Gamma XXL LF
Henry Schein Hand Held
HoMedics, LLC. BPA-110-2CA
HoMedics, LLC. BP-A06-00CA
IMCO Hand Held
Keller Medical Specialties KMS890
Keller Medical Specialties KMS 890
Klinik Erkameter
LabTron Hand Held
Life Brand 5534
Mabis Health Care Inc. Hand Held Sphygmomanometer
Mabis Health Care Inc. Hand Held
Mabis Health Care Inc. 04-244-001
Mabis Match Mates Hand Held
Mansfield Medical Distributors Ltd Hand Held
McCoy Rigby Single Tube
Medisana AG ETP
Mercurial Mercury
Microlife Corporation BP3MX1-1
N/A Floor Model
N/A Hand Held
Nasco Iso Plastics LF03956
Omron Healthcare Inc. 12-605
Omron Healthcare Inc. BP760CAN (HEM-7220-CA)
Omron Healthcare Inc. HEM-629
Omron Healthcare Inc. HEM-605
Omron Healthcare Inc. HEM-601
Omron Healthcare Inc. HEM-431
Omron Healthcare Inc. HEM-412CRELN2
Omron Healthcare Inc. HEM – 7411CAN
Omron Healthcare Inc. Hand Held
Omron Healthcare Inc. BP785CAN
Omron Healthcare Inc. BP785 (HEM-7222-Z)
Omron Healthcare Inc. BP762CAN
Omron Healthcare Inc. BP760CAN
Omron Healthcare Inc. BP755CAN-CD6
Omron Healthcare Inc. BP742CAN (HEM-7200-CA)
Omron Healthcare Inc. BP710CAN
Omron Healthcare Inc. BP710(HEM-7113-Z)
Omron Healthcare Inc. 964804
Omron Healthcare Inc. 705IT
Omron Healthcare Inc. 412CREL
Omron Healthcare Inc. 2Z01998L
Omron Healthcare Inc. BP785
Omron Healthcare Inc. HEM-7000-CANCS
Omron Healthcare Inc. HEM-650
Omron Healthcare Inc. HEM-712c
Omron Healthcare Inc. HEM-780
Omron Healthcare Inc. HEM-775CAN
Omron Healthcare Inc. HEM-775 CAN
Omron Healthcare Inc. HEM-773
Omron Healthcare Inc. HEM-757
Omron Healthcare Inc. HEM-741CAN
Omron Healthcare Inc. HEM-741
Omron Healthcare Inc. HEM-7220-CACS
Omron Healthcare Inc. HEM-780CANN
Omron Healthcare Inc. HEM-712CN2
Omron Healthcare Inc. HEM-780N2
Omron Healthcare Inc. HEM711LXCAN
Omron Healthcare Inc. HEM-711DLXCAN
Omron Healthcare Inc. HEM-711DLX
Omron Healthcare Inc. HEM-711DCXCAN
Omron Healthcare Inc. HEM-711ACCANN
Omron Healthcare Inc. HEM-711ACCANIN
Omron Healthcare Inc. HEM-711
Omron Healthcare Inc. HEM-705CPCAN
Omron Healthcare Inc. HEM-705CP
Omron Healthcare Inc. HEM-7121-CA
Omron Healthcare Inc. HEM-7220-CA
Omron Healthcare Inc. HEM-780CAN
Omron Healthcare Inc. HEM-650CANN
Omron Healthcare Inc. N/A
Omron Healthcare Inc. Marshall 85
Omron Healthcare Inc. HEM-907xl
Omron Healthcare Inc. HEM-790ITCAN
Omron Healthcare Inc. HEM790ITCAN
Omron Healthcare Inc. HEM-780N3
ParaMed Technology Inc. 910
Prestige Medical One Pieace
Prestige Medical Hand Held
Rexall Brands Corp RX800
Rexall Brands Corp RX100
Riester GmbH Wall Mount
Riester GmbH Floor Model
Riester GmbH Minimus II
Shoppers Drug Mart, Ltd. BC03
Smiths Medical PM INC. N/A
Smiths Medical PM INC. Mini-Torr Plus
Sphygmomanometer Hand Held
Summit Doppler Systems Hand Held
Sunbeam-Oster Company 7621
SunTech Medical Inc. Hand Held
Taylor MOD II
Taylor Hand Held
Technomedic Hand Held
Thermor Ltd. 33601
Thermor Ltd. 3MS1-4K
Thermor Ltd. 3AL1-3E
Tremblay Harrison, Inc. ABP-A1
Tyco Healthcare Group LP N/A
Tyco Healthcare Group LP Wall mounted
Tyco Healthcare Group LP Wall Mount
Tyco Healthcare Group LP Wall Model
Tyco Healthcare Group LP Wall
Tyco Healthcare Group LP Super Shock Resistant
Tyco Healthcare Group LP One Piece
Tyco Healthcare Group LP Mercury Wall Mount
Tyco Healthcare Group LP Mercury
Tyco Healthcare Group LP Hand Held
Tyco Healthcare Group LP Hand
Tyco Healthcare Group LP Floor Model
Tyco Healthcare Group LP Dual Tube
Tyco Healthcare Group LP Cart
Tyco Healthcare Group LP Single Tube
Utility Hand Held
Utility N/A
Veridian Healthcare LLC Floor Model
Vetline Vet HDO
VSM MedTech Ltd BP3-300
W. A. Baum Co. Inc. N/A
W. A. Baum Co. Inc. Wall Model
W. A. Baum Co. Inc. Wall Mount
W. A. Baum Co. Inc. Wall
W. A. Baum Co. Inc. Standby
W. A. Baum Co. Inc. Riester
W. A. Baum Co. Inc. Mercury Wall Mount
W. A. Baum Co. Inc. Mercury
W. A. Baum Co. Inc. Hand Held
W. A. Baum Co. Inc. Floor Model
W. A. Baum Co. Inc. Baumanometer
W. A. Baum Co. Inc. 1050
W. A. Baum Co. Inc. 0950NL
W. A. Baum Co. Inc. Wall Mounted
Wal-Mart Canada 20457
Welch Allyn Wall Mount
Welch Allyn N344
Welch Allyn Floor Model
Welch Allyn D-72417
Welch Allyn 5300
Welch Allyn Hand Held
Yamasu Pakistan Hand Held




Written By: Greg Kishimoto

Edited By: Tyler Hasenpflug CET

2 Responses

  1. Jeff Heilbraun

    Hello, I hope all is going well. I wanted to see if you still support the maintenance of the BpTRU-200 device. I work for a cardiac safety core lab in support of the pharmaceutical R&D arena and have an inventory of BpTRU -200 devices. With the BpTRU company closing I am trying to identify resources for technical support and maintenance.

    Thanks in advance for your follow-up

    Jeff Heilbraun
    VP Strategic Development
    +1-301-792-5073 cell phone

    • Tyler Hasenpflug

      HI Jeff,

      If you need more information on this please e-mail me at info@trhservices.ca and I will gladly assist you.