Faults - WIKA TR25 Manual De Instrucciones

8. Calculation examples for self-heating ... / 9. Faults
Simplified verification of intrinsic safety for the above-mentioned combination
Sensor
U : DC 30 V
i
I : 550 mA
i
P (max) at the sensor = 1.5 W
i
C : negligible
i
L : negligible
i
Upon comparing the values, it is obvious that it is permissible to connect these instruments
to one another. However, the operator must also take into account the values for
inductance and capacitance of the electrical connection leads.

9. Faults

DANGER!
Danger to life from explosion
Through working in flammable atmospheres, there is a risk of explosion
which can cause death.
▶
Only rectify faults in non-flammable atmospheres!
WARNING!
Physical injuries and damage to property and the environment caused
by hazardous media
Upon contact with hazardous media (e.g. oxygen, acetylene, flammable
or toxic substances), harmful media (e.g. corrosive, toxic, carcinogenic,
radioactive), and also with refrigeration plants and compressors, there is a
danger of physical injuries and damage to property and the environment.
Should a failure occur, aggressive media with extremely high temperature
and under high pressure or vacuum may be present at the instrument.
▶
For these media, in addition to all standard regulations, the appropriate
existing codes or regulations must also be followed.
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the listed measures, the instrument
must be taken out of operation immediately.
▶ Ensure that pressure or signal is no longer present and protect against
accidental commissioning.
▶
Contact the manufacturer.
▶
If a return is needed, please follow the instructions given in chapter 11.2
"Return".
WIKA operating instructions model TR25 (Ex i)
Head-mounted transmitter
U : DC 6.5 V U : DC 30 V
o i
I : 9.3 mA I : 130 mA
o i
P : 15.2 mW P : 800 mW
o i
C : 24 µF C : 7.8 nF
o i
L : 365 mH L : 100 µH
o i
Power supply unit
U : DC 25.4 V
o
I : 88.2 mA
o
P : 560 mW
o
C : 93 nF
o
L : 2.7 mH
o
EN
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