Electrical connections:
All electrical connections must be performed by qualified, ATEX-approved personnel. Under no circumstances may the
manufacturer be held liable for the performance of these connections, which are outside the scope of its services.
Prevention of corrosion:
If any rust appears, sand the corroded surface with an emery cloth, clean, then protect with rustproof, anti-electrostatic paint.
23.2 - Periodic inspections/checks
Unit vibration
DANGERS
■
The vibration check detects:
-
Any wear to rotating parts. Any significant discrepancy in the vibration speeds may cause parts to come into contact with each
other, which may spark an explosion; it may even cause certain parts to break with the same result.
-
An increase in the vibration speeds may also indicate that there is an accumulation of dust and an imbalance has been created.
An accumulation of dust can spark an explosion, by creating areas of contact or by reducing the ignition temperature of the gas.
CHECK
Users must ensure that the vibration levels of the fan remain below the standardised levels, and that there are no deviations in the
vibration speed values.
Application category BV3 according to standard ISO 14694.
FREQUENCY OF CHECK
Depending on the use (room temperature, and hourly rate of rotation of the device) and the fluid circulated (from highly charged with
particles, to very clean), users must check the vibration speeds so that any discrepancy in the speed levels can be detected.
■
The frequency of checks must be as follows:
-
Every 150 hours, or weekly, during the first month of installation.
-
Every 2000 hours, or every 3 months thereafter.
CORRECTIVE ACTIONS
If a deviation in the vibration speed values is noted, the fan must be stopped and the impeller inspected. If dust is found, all the areas
affected must be thoroughly cleaned. If the vibration speed level is still compliant with the standardised thresholds, the fan may return
to normal operation.
If the alarm level is reached, schedule a 2
nd
inspection and return to checking every 150 hours, or weekly.
If the maximum standardised vibration thresholds are exceeded, the fan must be stopped, a record must be made, and a 2
nd
inspection
must be performed.
In all cases, a vibration check must be performed after the fan is returned to normal operation.
Checking the ground continuity
DANGERS
■
There is a risk of electrostatic discharge.
CHECK
■ For fans fitted with straps:
-
Perform a visual inspection of the ground straps (check they are present) and check that the ground strap terminal retaining
screws are correctly tightened.
-
With the fan switched off, measure the resistance between one ground strap terminal on the intake section and the connection
terminal to the customer ground with a supply of 12 Volts. During the first check, this measurement must be noted on the
maintenance sheet (see section 22.4 - Appendix, next page) as well as the reference resistance. The resistance must not exceed
25% of the reference resistance.
■
If the resistance check exceeds 25% of the reference resistance:
-
Dismantle each ground strap terminal individually. Only one terminal must be disconnected at a time (this operation must be
performed with the fan switched off).
-
Check that there is no area of pitting corrosion on the grounding lug or strap terminal.
-
Repeat the resistance measurement.
FREQUENCY OF CHECK
■
Elements ensuring ground continuity must be checked at the following intervals:
-
Every 150 hours, or weekly, during the first month of installation.
■
If any irregularity is detected during this period of observation:
-
Every 5000 hours, or annually thereafter.
23 - SPECIAL INFORMATION FOR ATEX AREAS
24
Summary of Contents for 09PE
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