Diamond Deluxe Mercurial Blood Pressure Apparatus (BPMR120)
Pack Sizes Available
Product Description
Technical Specifications
- Mercury Purity: 99.99% — triple distillation process
- Scale Range: 0 to 300 mmHg — high-contrast scale with fine numbering
- Cuff Sizes Available: Standard adult 22-32cm; large adult 32-45cm (specify at order)
- Cuff Fastening: Velcro strap — secure, adjustable closure
- Control Valve: Special precision valve for smooth, controlled pressure release rate
- Housing Finish: Hi-stove climate-resistant paint — suitable for tropical and variable-climate environments
Frequently asked questions
Mercury purity directly affects the consistency of the column height readings and the calibration accuracy of the device. Impure mercury has a higher density than pure mercury due to dissolved impurities, which changes the column height for a given pressure — meaning the readings will not accurately reflect true blood pressure values. Diamond apparatus uses 99.99% purity mercury achieved through triple distillation, which ensures that the column weight and density remain consistent with the calibration standard of 760 mmHg at 0°C against which the scale was manufactured.
The cuff is wrapped around the upper arm with the lower edge approximately 2cm above the antecubital fossa. A stethoscope is placed lightly over the brachial artery at the antecubital fossa. The cuff is inflated to 180 mmHg or approximately 30 mmHg above the expected systolic. The release valve is opened to deflate the cuff at approximately 3 mmHg per second. The first Korotkoff sound (knocking sound heard through the stethoscope as blood flow resumes) marks the systolic pressure; the point at which the sound disappears marks the diastolic pressure.
Diamond Deluxe mercurial apparatus is available with standard adult cuff (22-32cm arm circumference), large adult cuff (32-45cm arm circumference), and in some configurations a small adult or paediatric cuff option. Using a cuff that is the wrong size for the patient's arm circumference introduces systematic error in the reading — a cuff that is too small overestimates blood pressure, and a cuff that is too large underestimates it. The cuff bladder should encircle at least 80% of the upper arm circumference.
Mercury sphygmomanometers must be placed on a firm, flat, horizontal surface and kept in an upright position during use. They should not be tilted, dropped, or subjected to impact, as this can fracture the glass column and release mercury — a health and environmental hazard. When transporting the unit, the mercury reservoir must be locked or secured per the manufacturer's guidance. Broken mercury apparatus requires specialist mercury waste disposal. Note that mercury sphygmomanometers are banned or restricted in some countries — confirm import regulations for your destination market before ordering.
Mercury sphygmomanometers should be checked for calibration accuracy annually in clinical settings. Calibration involves comparing the device's mercury column readings against a known reference pressure source using a calibration pump and pressure gauge. The mercury reservoir level should also be checked and topped up if needed, using mercury of the same purity specification as the original fill. The control valve and inflation bulb should be inspected for leaks at each service interval.
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