KNF NF 1.100 EX, Инструкции по эксплуатации и монтажу, Страница: 4 / 32

Diaphragm liquid pump NF 1.100 EX Use
KNF Flodos AG BA_NF1.100EX_EN_05_152147
English translation of original Operating and Installation Instructions
4
2.4. Explanation of explosion prevention and pro-
tection markings
2.4.1. Equipment groups
Equipment Group 1 applies to equipment for use in the under-
ground operations of mines and any of their surface installations
that may be at risk from methane and/or combustible dust.
Equipment Group II applies to equipment for use in other areas
which may be at risk from explosive atmosphere.
2.4.2. Equipment Categories for gas
The Equipment Category describes the frequency and duration of
occurrence of explosive atmospheres in an area.
Equipment
Category
Description* Constructional
safety
1 Areas in which hazardous explosive atmospheres are likely to occur
continuously, for long periods or frequently. Very high
2 Areas in which hazardous explosive atmospheres are likely to occur
occasionally. High
3 Areas in which it is unlikely that hazardous explosive atmospheres
will occur, or if they do occur, are only likely to do so infrequently and
for a short time. Normal
Tab. 3 *in accordance with EN 1127-1
2.4.3. Temperature classes
The maximum surface temperature is the highest temperature
reached by one of the pump's surfaces under worst case condi-
tions.
The maximum surface temperature of the pump must always be
lower than the lowest ignition temperature of the gas or vapour/air
mixture in which it is operated.
The maximum surface temperature depends on the design of the
pump, and is shown as a temperature class.
Temperature class Max. surface tem-
perature [°C] Ignition temperature
[°C]
T1
≤ 450
> 450
T2
≤ 300
> 300
T3
≤ 200
> 200
T4
≤ 135
> 135
T5
≤ 100
> 100
T6
≤ 85
> 85
Tab. 4
Equipment Group I
Equipment Group II
Maximum surface
temperature
Ignition temperature
Temperature class