pH 170/
pH 296
Installation
104
General instructions
•
Instruments to be installed in the field (pH 170) must be equipped with a
protective cover (see WTW accessories).
•
After installing the pH 170, close the cover to ensure compliance with the
IP66 standard.
•
Inputs/outputs require no additional lightning protection.
The measures required for lightning protection are already incorporated in the
monitor and any existing lightning protection measures can be used in addition.
•
The PG screws of the pH 170 are designed for cable diameters of 10 to
14 mm.
Unused cable feed-throughs (PG screws) are equipped with a sealing plug to
ensure compliance with the IP66 standard.
Power supply
Only allow qualified electricians to perform the installation as it
involves a line voltage that could endanger life.
A bipolar disconnection option between instrument and mains is
provided (e.g. a fuse)!
Depending on the version, the instruments are designed for
230 VAC, 115 VAC
,
24 VAC or 24 VDC
. The line voltage is printed on the nameplate. Always check
that the correct line voltage is applied before commissioning the instrument.
An incorrect line voltage can result in damage to the
instrument!
In instruments with a 24 VDC module, observe the following:
Only operate instruments with a voltage source that fulfills the requirements for
SELV (Safety Extra Low Voltage with enhanced insulation against dangerous
voltages) in accordance with EN 60950.
Without an interface, the requirements should fulfill EN 61010-1.
All instruments of the "170/296" series are constructed in accordance with safety
class II, i.e. no protective earth conductor is required.
Do not feed the protective earth conductor into the instrument or
connect it to an instrument terminal or to a supply line!
Only authorized WTW technicians are allowed to change the
instrument fuse.
