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| Precaution for Intrinsical Safe Meter in Operation |
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This intrinsical safe meter is approved by National Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation (NEPSI), according to National Standard GB3896.1/4-2000, mark of explosion proof is ExibIICT4, certificate No. GYB06179. It combined with safety barrier to make up an intrinsical safe explosion proof system, which can be used in relevant hazardous areas. You need to care of follows before installation:
a) There is grounding terminal in meter housing, you must ground the meter reliably;
b) This intrinsical safe meter must be combined with safety barrier which must be approved by Organization of Explosion Proof Inspection to make up intrinsical safe system;
c) The three cores shielded cable (core cross section is 0.5mm2 , with insulating sheath ) be used for connecting between meter to safety barrier, the shielded layer be single-end grounded in non-hazardous area. Cable layout should eliminate the electromagnetic interference as possible and make the cable distribution capacitance within 0.05F;
d) Ambient temperature range: -25 - +50≧. The relationship between temperature levels of explosion proof mark and inflame temperature as below:
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| Temperature Level |
T1 |
T2 |
T3 |
T4 |
T5 |
T6 |
| Inflame Temperature |
＋400≧ |
＋280≧ |
＋180≧ |
＋120≧ |
＋85≧ |
＋70≧ |
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e) The safety barrier should be installed in non-hazardous areas and operation should be according to the operation instruction;
f) Customer should not change the electric elements by himself;
g) Must obey the regulations of National Standard GB50058-92 while installation and maintenance.
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| Configuration of Intrinsical Safe System |
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| Safety barrier is zener or insulated type, please connect vortex flowmeter, flow calculator and safety barrier according to barrier instruction. |
| Precaution for Flameproof Meter in Operation |
This flameproof flowmeter is approved
by National Supervision and Inspection Center for Explosion
Protection and Safety of Instrumentation (NEPSI), according
to National Standard GB3896.1/4-2000, mark of flameproof
is Exd II BT4, certificate No. GYB06239.
a) Avoid opening wiring box and inlet wire box of flameproof
vortex flowmeter for daily maintenance. Cut off power
before open. If open the flameproof housing, flameproof
surface should be protected with no damage. Put flameproof
surface upwards and can not touch the earth directly
when check.
b) Non-flameproof meter and lamp fixture etc. are not
allowed for maintenance on site. All tools should be
flameproof.
c) Grounding terminal is available on housing. Meter
should be grounded reliably while operation.
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