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10 8 Pressure sensor installation
For general information about the pressure sensor instal-
lation please refer to the manufacturer manual. Ensure
that the pressure sensor is suitable for your application
regarding pressure range and temperature resistance.
ƒ LORENTZ PSk2 CS-F pump ends allow the installa-
tion of the pressure sensor at the pump housing. This
is a simple alternative compared to the conventional
pipeline installation.
ƒ For the pump types LORENTZ PSk2 CS-F1 to CS-
F20 it is necessary to remove the vent plug to install
the pressure sensor. Therefore install the pressure
sensor after the pump is filled with water, see chapter
"11.1 Filling pump with water" on page 24.
ƒ All other LORENTZ PSk2 CS-F pump types have a
second filler plug which can be replaced by a pressure
sensor.
CAUTION – The connection thread
size at the pump housing of the
CS-F pumps is G1/2"
CS-G pump ends allow the installation of the pressure
sensor at the flanges of the suction and pressure side.
The connection thread size at the
pump housing of the CS-G pumps is
G1/4"
Figure 26: Pressure sensor installation
(a) PSk2 CS-F
BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
All specifi cations and information are given with good intent, errors are possible and products may be subject to change without notice. Pictures may
differ from actual products depending on local market requirements and regulations.
10 9 Automatic control for full-tank shutoff
We recommend the use of a float switch or other means
to prevent overflow of your tank. This will stop the pump
when the tank is full, then reset when the level drops. This
conserves ground water, prevents overflow, and eliminates
unnecessary pump wear. PSk controllers allow the use of
small signal cable to a remote float switch, even if the tank
is a long distance away.
Float switch requirements:
(1) A switch must be used, not wet electrodes.
(2) The preferred system requires a float switch to OPEN
contact on rise to turn the pump OFF. This is called
"normally closed" (N.C.).
Float switch cable requirements:
(3) Two wires are needed.
(4) Minimum wire size 1mm² / AWG 18. This is good for a
distance as far as 600 m / 2,000 ft.
(5) The cable must be suitable for its environment.
(6) If it must run a long distance, use twisted-pair shielded
cable to reduce the chance of damage from light-
ning-induced surge.
(b) PSk2 CS-F1 to F20
(c) PSk2 CS-G
23
Grounding shielded float switch cable – If you
use shielded cable, connect the shield to ground AT THE
CONTROLLER ONLY. DO NOT ground the shield at the float
switch. This will reduce surges induced by nearby lightning.
Operation of the float switch system – When the
water level is high, the float switch will stop the pump.
The TANK-FULL indicator on the controller will light up.
When the water level drops, the float switch will signal the
controller. The indicator light will go out, and the pump will
restart if sufficient power is available.
Wiring to the controller – The float switch must be
connected to the controller
via plug at slot B7, cf. chapter
"Table 4: Controller dimensions for installation" on page
9.
Manual remote control switch – The float switch circuit
can be used with a manual switch to turn the pump on and
off from a distance. Use any simple on/off switch available
from an electronic supply, electrical supply, or hardware
store (it only carries low voltage, very low current). Wire it
according to the illustration above, for a normally closed
float switch.
Figure 27: Float switch scheme
sealed
cable clamp
position pump off
cable
weight
position pump on
Sun. Water.
pumping
range
Life.
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