CaloSys Modules
49
Setting Sample Flow on Calorimetry Master Control Unit
11.2.3.
In order to set the air flow to the O2 and CO2 sensor, a further mass flow controller is built into the
Calorimetry Master Control Unit. The flow for this MFC is set by using the rotary knob on the front
panel of the Control Unit.
The flow to be set can be read off from the "Calo Current Values" dialog in the column "SampleFlow"
(see Software Operating Instructions – Calorimetry, Section "Status Menu, Calo"). When setting the
flow, wait until the displayed value has stabilized. Lock the setting with the locking lever (see arrow)
so that it cannot be accidentally altered.
Fig. 23 Rotary knob MFC sample flow at the Calorimetry Control Unit
Locking of sample flow setting
during installation according to the CaloSys module
configuration (rat/mouse). After a calibration, the setting should NOT be altered, as otherwise the
calibration will no longer be accurate and a new calibration procedure should be carried out. Lock the
setting you have made with the locking lever.
A standard CaloSys module with rat cages (type III) requires a flow of approx. 1.5…2.8l/min
according to the weight, the strain, medical treatment, etc., of the animal; one with mouse cages
requires a flow of approx. 0.4l/min. Also take the information about calibration given above into
account. If you have questions or need assistance, please contact
Combination Sensor for O2 and CO2 Concentration in Calorimetry Master
11.2.4.
Control Unit
The standard O2 sensor and the standard CO2 sensor are contained in a combination sensor built
into the Calorimetry Master Control Unit. The air mixture is led into the sensor through tubing coming
from the Sample Switch Unit. For high-speed measurements, a separate measuring Unit is available
(see Hardware Operating Instructions - High-Speed Sensor Unit).
11.2.4.1. O2 Sensor - Working Principle
The O2 sensor consists of a sensor cavity, which is open to the gas to be measured. The
concentration of the gas is determined by using two zirconium-stabilized electrodes.
