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The Blood Monitoring Unit BMU 40 is an inline monitoring device for continuous measurement of vital blood parameters during extracorporeal circulation. The measuring values are oxygen partial pressure (paO2) and temperature (Ta) on the arterial side as well as oxygen saturation (SvO2), hemoglobin (Hb), hematocrit (HCT), and temperature (Tv) again on the venous side. The values are displayed on a 10.4” touch screen monitor, offering enough space for the clear arrangement of the measuring values and the important display and control elements.

With the BMU 40 from Maquet, a unique barcode calibration system replaces the time-consuming and costly calibration procedures using calibration gases. In order to minimize any measuring tolerances while the heart-lung machine is in use, the calibration data of the BMU 40 sensors and the BMU 40 cells are set by Maquet in the factory and encoded in a label that is read with an integrated barcode scanner directly before use. In conjunction with the latest sensor technology, this enables unrivalled measuring precision.


Innovative sensor technology ensures optimized blood flow properties for maximum measuring precision

Quick Calibration

Calibration in less than 5 seconds*, without the need for calibration gas

User-Friendly Operation

Touch screens featuring numeric, graphic and tabular displays for ease of use; user-chosen alarm limits can be set for all measured parameters

Uninterrupted Operation

An integrated battery pack ensures uninterrupted operation


BMU 40 sensors have minimal drift, providing accurate values throughout the procedure

Data Accessibility

The BMU 40 interfaces with data collecting software, such as JOCAP XL; data can be printed or downloaded via USB port

Stable Connection

Smart and stable probe cuvette connection

*Data on file

Monitor specifications
Size (H x W x D) 220 x 380 x 170 incl. probes
Weight 5 kg
Power supply 100 – 240V, 50/60 Hz (60 VA)
Battery runtime Approx. 60 minutes
Touch screen Touch screen 10.4", resolution 800 x 600
Data ports

2x serial RS 232 for data output and/or pump flow input

1x USB for data storage on USB stick

1x USB for inkjet printer
Venous probe head
Measuring method SvO2 Ratiometric
Measuring method Hb and Hct Spectrophotometric
Temperature measurement method Infrared-thermopile sensors
Size (H x W x D) 75 x 110 x 29
Weight 110 g
Cable length 180 cm
Available sizes 1/2”, 3/8”, and 1/4”
Arterial probe head
Measuring method paO2 Luminescence
Temperature measurement method Infrared-thermopile sensors
Size (H x W x D) 75 x 110 x 29
Weight 100 g
Cable length 180 cm
Available sizes 3/8”, 1/4”, and 3/16”


How to order

To place an order or learn more about any of the Maquet products, related accessories, or therapeutic solutions, please contact your local sales representative.