Specifications

158 RK0YG302 © Danfoss 05/2007
Pressure transmitters
AKS 32, AKS 33 and AKS 32R
Introduction
AKS 32 and AKS 33 are pressure transmitters that measure a pres-
sure and convert the measured value to a standard signal:
• 1 → 5 V d.c. for AKS 32
• 4 → 20 mA for AKS 33
AKS 32R is a ratiometric pressure transmitter that converts the
measured pressure to a linear output signal. The min. value of the
output signal is 10% of the actual supply voltage. The max. value
is 90% of the actual supply voltage.
At a supply voltage of 5 V, a linear output signal is thus obtained, i.e.
• 0.5 V at min. pressure of the pressure transmitter
• 4.5 V at max. pressure of the pressure transmitter
Application:
• A/C systems
• Refrigeration plant
• Process control
• Laboratories
Advantages
Highly developed sensor technology means high pressure regu-
lation accuracy, a very important factor in the precise and energy-
economic capacity regulation of refrigeration plant.
• Temperature compensation for LP and HP
pressure transmitters, developed specially for refrigeration
plant:
LP: −30 → +40°C (≤16 bar)
HP: 0 → +80°C (>16 bar)
• Compatibility with all refrigerants incl. ammonia means less
stock and greater application exibility.
• Eective protection against moisture means that the sensor can
be mounted in very harsh environments, e.g. in the suction line
encapsulated in an ice block.
• Robust construction gives protection against mechanical inu
-
ences such as shock, vibration and pressure surge. AKS sensors
can be mounted direct on to the plant.
• No adjustment necessary. With the highly developed sensor
technology and sealed gauge principle, the accuracy of the fac-
tory setting is maintained independent of variations in ambient
temperature and atmospheric pressure. This is very important
when ensuring evaporating pressure control in air conditioning
and refrigeration applications.
• Built-in voltage stabiliser
• EMC protection according to EU
EMC-directive (CE-marked)
• UL approved
Output signal
The diagram indicates the relationship between output signal from AKS 32R,
supply voltage and pressure.
V
supply
= Voltage supply
AKS 32R
AKS 32, AKS 33
Upper working
range