<1. Introduction>
4
IM 01E25A01-01EN
(2) Installation
WARNING
• The magnetic flowmeter is a heavy instrument.
Be careful that no damage is caused personnel
through accidentally dropping it, or by exerting
excessive force on the magnetic flowmeter. When
moving the magnetic flowmeter, always use a trolley
and have at least two people carry it.
• Do not apply excessive weight, for example, a
person stepping on the magnetic flowmeter.
• The magnetic flowmeter must be installed within the
specification conditions.
•
Connect the Protective Grounding Terminal
Ensure to connect the protective grounding to
prevent electric shock before turning on the power.
•
Do Not Impair the Protective Grounding
Never cut off the internal or external protective
grounding wire or disconnect the wiring of the
protective grounding terminal. Doing so invalidates
the protective functions of the instrument and poses
a potential shock hazard.
•
Do Not Operate with Defective Protective
Grounding
Do not operate the instrument if the protective
grounding might be defective. Also, ensure to check
them before operation.
•
Do Not Operate in an Explosive Atmosphere
Do not operate the instrument in the presence
of flammable gas, vapors, or combustible dust.
Operation in such an environment constitutes a
safety hazard. Prolonged use in a highly dense
corrosive gas (H
2
S, SO
x
, etc.) will cause a
malfunction.
•
Ground the Instrument before Making External
Connections
Connect the protective grounding before connecting
to the item under measurement or control unit.
•
Damage to the Protection
Operating the instrument in a manner neither
described in this manual nor the manuals as listed in
Table 1.1 may damage the instrument’s protection.
• The flowmeter should be installed away from
electrical motors, transformers, and other power
sources in order to avoid interference with
measurement.
• Install an external switch or circuit breaker as a
means to turn the power off (capacitance: 15A,
conforming to IEC60947-1 and IEC60947-3).
Locate this switch either near the instrument or
in other places facilitating easy operation. Affix a
"Power Off Equipment" label to this external switch
or circuit breaker.
• All procedures relating to installation must comply
with the electrical code of the country where it is
used.
(3) Wiring
WARNING
• In cases where the ambient temperature exceeds
50°C, use external heat resistant wiring with a
maximum allowable temperature of 70°C or above.
• When wiring the conduits, pass the conduit through
the wiring connection port, and utilize the waterproof
gland to prevent water from flowing in. Install a drain
valve at the low end of the vertical pipe, and open
the valve regularly.
• Do not connect cables outdoors in wet weather in
order to prevent damage from condensation and to
protect the insulation, e.g. inside the terminal box of
the flowmeter.
• The transmitter case should be removed by
YOKOGAWA’s qualified personnel only. Opening
the transmitter case is dangerous, because some
areas inside the instrument have high voltages.
• The protective grounding must be connected
securely at the terminal with the mark to avoid
danger to personnel.
(4) Operation
WARNING
Be sure to enable the write protect function to prevent
the overwriting of parameters after finishing parameter
setting.
In rare cases, the infra-red switches may respond
unexpectedly in such conditions as sticking ball of water
or extraneous substances on the surface of display
panel glass according to the principle of infra-red switch
operation. Its probability rises in such cases as sticking
rain water by storm or other similar situation and
washing up work near flowmeter installation place.
Blinking light from a flashlight etc. to the infra-red
switches may result in the malfunction.
Read Section 6.3 for the hardware write protect
function, and the user's manual of applicable
communication type as listed in Table 1.1 for the
software write protect function.
