Refco M2-3-DELUXE-DSR744-TC Bedienungsanleitung Seite 5

2.4 Intended Use
The manifolds have been designed especially to measure pressure in
refrigeration equipment. For use only by trained technicians.
The 2-way manifold is a high precision instrument. Both gauges,
high and low pressure can be readjusted to the zero point. The
manifold gauges are marked with temperature and pressure scales.
The scales of the suction and pressure gauges only contain
temperature values up to the critical point of R744 (CO2). This point
is reached at the critical pressure 73.75 bar (a) with the critical
temperature 30.98 °C. At higher pressures, the refrigerant is in the
transcritical state. Therefore, no temperature can be assigned due to
lack of wet steam area.
Changeable needle type valves ensure perfect sealing. Glycerine-oil
filled gauges are equipped with a safety pressure relief in case of a
pressure build up inside the gauge due to a defect.
5 Instruction Manual