Watson-Marlow SPS - Manual (Page 14)

MasoSine SPS sinusoidal pumps User Manual 14
8.2 Earthing the pump
SPS pumps are equipped with an earthing point.
The pump must be earthed by an earthing cable
secured to the correct position. SPS 100 must
be earthed at the base of the rear foot. Other
models must be earthed as shown: with cast iron
power frame, right; with stainless steel power
frame, below right. This is particularly important in
potentially explosive atmospheres.
In addition to earthing the pump, the
drive motor must also be earthed. If the
drive is not earthed,
the pump unit may not
be operated.
8.3 Material properties
The plastic parts fitted inside the pump react more to temperature changes than
stainless steel parts. For this reason, the specified maximum fluid temperature for
which the pump is designed must not be exceeded. This temperature is included in
your purchase documents. If the specified temperature is exceeded, linear expan-
sion may block the pump; this in turn could cause the pump to fail or could result
in damage to parts of the pump. In addition, excessive temperatures can accelerate
the wear of dynamic parts and reduce the life of plastic parts.
Corrosion may occur to a pump’s cast iron power frame if the paintwork is damaged.
Corrosion represents a hazard for the use of pumps in potentially explosive
atmospheres (for measures, see 20 Troubleshooting).
Pumps with a stainless steel power frame are not subject to power frame corrosion.
8.4 Pressure conditions
A pressure controller must be installed to avoid over-pressure in the pump as a
result of a closed pressure line.
8.5 Maintenance and repair
l Fill the pump with product before starting only outside the explosive atmos-
phere area. All tools used should comply with ATEX regulations.
l The pump unit must be kept free of dust with a damp cloth: accumulated dust
can smoulder.
l The flushing channels in the power frame must be free of blockages and, if
necessary, cleaned.