Vaisala K-PATENTS PR-23 AX Series, Instruction Manual

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10 PR-23 instruction manual
3.2 Mounting Indicating transmitter
The Indicating transmitter is mounted indoors, it should preferably be located in an
easily accessible, well lit and dry area. Avoid vibration. Take interconnecting cable
length into consideration when choosing the mounting location.
The enclosure is mounted vertically on an upright surface (wall) using four mounting
feet, see Figure 3.3. The LCD is best viewed when approximately on the eye level of
the user.
In sanitary installations, the recommendation is to use a DTR with stainless steel en-
closure. If standard polycarbonate enclosure is used, it should be installed as remotely
as practical from the product areas or connections.
Important: Do not drill mounting holes in the enclosure as that will affect the pro-
tection class of the enclosure and damage the electronics.
Figure 3.3 Indicating transmitter: dimensions (mm/in)
and mounting feet measures
Note: The LCD display has an operating temperature range of 0–50 °C and a storage
temperature range of -20–60 °C.
Important: The DTR does not have a built-in power switch. The system is always
powered on when connected to a power source. Mounting an external power switch
to control the DTR’s power supply is recommended, Figure 3.6.
3.3 Electrical connections
3.3.1 Interconnecting cable
The cable contains a pair of twisted signal wires (1, 2) and a cable shield (3) (see
Section 3.3.2 and Figure 3.7). Standard delivery is 10 meters (33 feet) of cable. The
maximum length of an interconnecting cable is 200 m (660 ft). The signal wires (1, 2)
are interchangeable (non-polarized). The cable shield is connected to the protective
earth at the Indicating transmitter.