Electrical Connections - Lambrecht 15189 Operating Instruction

Operating Instruction
Precipitation Sensors (15189) + (15189 HL)

Electrical connections

The sensor will be connected to the cable by leading the ca-
ble through the conduit gland to the connector inside the sen-
sor housing. Recommended cable type:
2 (4) x AWG 2O CU L sw;
diameter approx. 5.1 mm
The cable should not be longer than 11 m.
When the cable is transferred inside the ground it is
recommended to protect the cable with a protecting
plastic tube.
Use of the bounce-free output signal
(see Fig. 7, page 6)
The usual circuit of the precipitation sensors is suitable for
connection to data loggers without an own bounce-free im-
pulse input. For this application the clamps 3 and 4 are used.
Make sure, that the current supply for the precipita-
tion sensor with usual circuit is not less than 100 μA
(see also technical data).
Use of the direct output signal
(see Fig. 8, page 7)
This circuit variant of the precipitation sensors is suitable for
connection to data loggers with a bounce-free impulse input.
For this application the clamps 1 and 6 are used. In this case
the current supply of the electronics with 100 μA is not nec-
essary.
The LAMBRECHT data loggers (TROPOS and SYNMET) are
equipped with such a bounce-free input. Thus the direct out-
put signal of the reed contact can be used. An additional ben-
efit is a low-current effect.
4 (15189) Precipitation Sensor
(15189 HL) Variety with heating
... i. e. with a controlled 2-circuit heating for collecting funnel
and drain pipe.
Electrical connections
For the connection of the heating a 4-core cable is required,
which has to apply and connect to the power supply unit ac-
cording to the connecting diagrams with heating.
The function of the heating elements can be tested also
at ambient temperatures above the control temperature of the
solid-state thermostat. For this simple test a regular magnet
has to be held close to the blue housing of the switching cir-
cuit. When reaching a surface temperature of approximately
50°C the current will be switched off.
Both blue thermostat modules are fitted internally on the fun-
nel surface as well as on the bottom of the housing.
The operational conditions will be indicated with colored light-
emitting diodes (LED) on the thermostatic module:
green: supply voltage
heating on
red:
Operating Instructions
green
red
Fig. 5