Installation component
Float switch
Floats in the tank: one detects the minimum level, the other a full tank. Each drives one input of the transmitter.
Quantity: 2
Completed projectHotels and tourismMountain hotel
A well about 1.5 km from the hotel: water level alarm and a remotely started pump
Radio monitoring of the water level in the tank with link supervision, and remote pump control, for a stand-alone hotel supplied from a deep well that is hard to reach in winter.
- approx. 1.5 kmto the deep well
- approx. 4 hto fill the tank
- 2water levels: minimum and full
01 / Investment context
What problem had to be solved?
The stand-alone mountain hotel accommodates several hundred guests and draws its water from a deep well about 1.5 km away. The well is hard to reach, especially in winter.
With a high turnover of guests, water consumption was unpredictable and the tank could suddenly run dry. Someone then had to go to the well and switch the pump on there, and filling the tank alone took about 4 hours. This happened fairly often and meant several hours without water in the hotel.
In winter, during heavy snowfall, the range of radio devices drops noticeably — and that is exactly when the well is hardest to reach.
The investor’s goal: To know in the hotel when the water in the tank drops to the minimum, and to start the pump from there, without driving to the well.
What was designed?
Two float switches are installed in the tank: one detects the minimum level, the other a full tank. They drive two inputs of a transmitter with link supervision (NRP-102K), powered from 12 V DC. In the hotel the receiver (RP10-2K) signals “no water” or “tank full”.
The transmitter and receiver supervise the link and the transmitter’s power supply: the receiver reports a lost link exactly like an alarm. This matters in winter — a missing signal is information, not a silence that reassures the staff.
A member of staff in the hotel switches the pump on and off with a long-range remote control (RNB-101). At the pump a high-sensitivity receiver (OPC-K01) in bistable mode controls the pump through its contactor’s control circuit: one press switches it on, the next switches it off. The “tank full” signal tells staff when to switch the pump off.
02 / Operating principle
From signal to action.
The tank’s state reaches the hotel by radio, and a remote control in the hotel starts the pump of the well about 1.5 km away.
Water level
-
01 / Signal source
Float switches Minimum and tank fullTwo float switches in the tank drive the transmitter’s inputs.
-
02 / Transmission
NRP-102K Transmitter at the tankSends the water states and supervises the link and power supply.
-
03 / Notification
RP10-2K Receiver in the hotel No water + Tank fullShows staff the tank’s state and any loss of the link.
The hotel knows when the water drops to the minimum. The receiver reports a lost link like an alarm, so in winter a missing signal is information too.
Well pump
-
01 / Signal source
RNB-101 Long-range remote control in the hotelStaff switch the pump on and off with one key.
-
02 / Reception
OPC-K01 Receiver at the pumpIn bistable mode it drives the pump contactor’s control circuit.
-
03 / Action
Pump Well about 1.5 km from the hotelOne press switches it on, the next switches it off.
The pump is switched on from the hotel, with no trip to the well. The “tank full” signal tells staff when to switch it off; filling the tank takes about 4 hours.
A simplified functional diagram.
03 / Installation components
Devices used in the project
The devices named in the description of the installation.
NRP-102K
Transmitter at the tank: sends two water-level states plus link and power supervision signals. 12 V DC supply, IP66 enclosure.
Quantity: 1
RP10-2K
Receiver in the hotel: signals “no water” and “tank full”, and reports a lost link to the transmitter like an alarm.
Quantity: 1
RNB-101
Long-range remote control in the hotel: one key with which staff switch the pump on and off. 9 V battery, external antenna.
Quantity: 1
OPC-K01
High-sensitivity receiver at the pump, in bistable mode: its relay output drives the pump contactor’s control circuit, not the pump itself.
Quantity: 1
Catalogue figures describe a device under stated conditions, usually in open terrain, and are not a guaranteed range in every installation. Device quantities in the examples are indicative.
04 / Value for the investor
What does this solution give you?
Warning before the water runs out
The minimum-level signal arrives in the hotel, so the pump can be started at once, instead of the problem showing up as taps suddenly running dry.
No trips to the well
The pump is started from the hotel, so the difficult winter road to the well no longer decides whether the hotel has water.
Silence does not mean all is well
Link supervision reports a lost link like an alarm, so in winter, when snow reduces the range, staff know they have lost sight of the tank.
05 / Before installation
What needs to be settled for a similar investment?
Before devices are chosen, what matters is the site’s conditions and how the system ties into the final installation.
Requirements to verify
- The catalogue range of the NRP-102K and RNB-101 is 1000 m in open terrain, and the well is about 1.5 km from the hotel: a range test along the route decides on directional antennas or repeaters.
- 12 V DC power at the tank and at the pump — for the transmitter and for the receiver that controls the pump.
- Today GORKE recommends LX-series devices for pump control, with separate “on” and “off” keys and receipt confirmation — a multi-button remote control and an LX receiver, up to 5 km in open terrain.
- Receipt confirmation means the receiver accepted the command, not that the pump is running — that would need a separate feedback signal, e.g. from an auxiliary contact of the contactor.
Source: an archived GORKE description of the installation. For a new investment we choose current models.
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