Watson-Marlow EC 25 - Manual (Page 8)

Revision 4.4 / November 2010
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5.3 Zone classification
The Watson-Marlow MasoSine - Pumps can be used in explosive areas of the zone 1 / 21.
This corresponds to the category 2 G / D.
It is expressly forbidden to use the pump(s) in the zone 0!
5.4 Classification of the ex-atmospheres
A distinction is made between dust and gas explosive atmospheres. In the model code, the atmosphere is abbreviated with G
(Gas) and D (Dust). Watson-Marlow MasoSine - Pumps are only designed for the explosive atmospheres G (Gas) and D
(Dust)!
5.5 Ignition protection
Our pumps are subject to ignition protection "c" constructive safety according to the standard for "non-electric appliances for use
in explosion-risk areas" EN 13463-5
5.6 Temperature classes
For product temperature up to max. 95°C: EX II 2 G c T4
EX II 2 D c T=120°C
5.7 Limit values for the pump
The limit values for the pump (max. speed, max. pressure, max. temperature) are stated in the data sheet (see page 4). These
limit values must never be exceeded under any circumstances! This applies in particular when using a frequency converter.
If the pumps are supplied without a drive, the following values apply!
EC25 EC40 EC60
max. Pressure * 6 bar 6 bar 6 bar
max. Speed * 600 rpm 600 rpm 600 rpm
max. Temperature * 95°C* 95°C* 95°C*
Ambient temperature -12°C bis +40°C -12°C bis +40°C -12°C bis +40°C
5.8 Grounding the pump
All supplied pumps are equipped with a grounding option.
In particular in ex-areas, the pump must be grounded by fixing a grounding cable to the corresponding position (see diagram).
In addition to the grounding of the pump, the motor also needs to be grounded! If the drive is not grounded, the pump aggregate
may not be operated.
5.9 Material properties
Plastic parts that are fitted inside the pump react more to temperature changes that stainless steel parts. For this reason, the
specified maximum medium temperature (Tm=95°C), for which the pump is designed, may not be exceeded. If the specified
temperature is exceeded, this may cause a linear expansion and may block single components; this in turn could cause the
pump to fail or could result in damage to parts of the pump. Also, excessive temperatures can accelerate the wear of dynamic
parts and therefore reduce the lifespan of the plastic parts.
Corrosion may occur to the Power Frame of the pump if the paintwork is damaged. Corrosion represents a hazard for the use of
pumps in explosive areas (for measures, see Troubleshooting Chap. 21).
5.10 Pressure Conditions
To avoid any over-pressure in the pump as a result of a closed pressure line, a pressure controller must be installed.
* depending on the rating of the pump (pls. see order confirmation)
Grounding