NBX-102
LX transmitter at the compressor controller: two NC inputs for the fault and pressure-drop contacts, plus a housing tamper circuit. Battery-powered, range up to 4 km in open terrain.
Quantity: 1
Example configurationIndustry
A compressor fault known at once — in the maintenance office and by text after hours
An LX transmitter at the compressor controller, a receiver with a signal unit in the maintenance office, and a GSM transmitter that texts the person on call — at night and at weekends too.
- 300 mfrom compressor house to maintenance
- 2alarm states from the controller
- 4 kmLX range in open terrain
01 / Investment context
What problem does this configuration solve?
The compressors supply compressed air to production, yet they stand in a separate building 300 m from the maintenance office, behind a steel-framed hall. The compressor controller provides alarm contacts — compressor fault and pressure drop — but nobody sees them, because nobody normally works in the compressor house.
A cable across the site means trenching, crossings under internal roads and disruption to traffic, and an ordinary radio link may not get through a steel hall. After hours a fault only comes to light in the morning, when the pressure in the network has dropped and the lines are standing — and then losses are counted in hours of downtime rather than minutes of repair.
The investor’s goal: Each of the controller’s two alarm states known at once: in the maintenance office by day, and on the on-call phone at night and at weekends.
How does this configuration work?
The controller’s alarm contacts — compressor fault and pressure drop — are wired to the two NC inputs of a battery-powered LX transmitter (NBX-102) mounted next to the controller. When a contact opens, the transmitter sends the event using LoRa modulation, designed to work where an ordinary radio link fails, and the receiver confirms each transmission back to it. A range test decides whether the signal reliably gets past the steel hall.
In the maintenance office each alarm state switches one of the two relays of an LX receiver (RSX-K02). Both relays switch on a signal unit with volume control (SWR-108) and feed the state to the inputs of a GSM transmitter in a housing with a power supply (ATG-SG4set), which sends a text with its own wording for each state. Because each output drives two devices, a relay module (MPU-121) on each channel separates the GSM input.
The on-call numbers and message texts are set from a computer with a programming cable (K-5). The receiver, the signal unit and both modules run on a 12 V DC power supply in the office. An LX confirmation only means that the transmission has reached the receiver — only the controller shows the state of the compressors.
02 / Operating principle
From signal to action.
The compressor controller’s two alarm states travel by LX radio to the maintenance office, and from there by text to the person on call.
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01 / Signal source
Compressor house Compressor controller contactsA compressor fault or a pressure drop opens an alarm contact.
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02 / Transmission
LX link 300 m, with a steel hall in betweenThe transmitter at the controller sends the state, and the receiver in the office confirms receipt.
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03 / Notification
Maintenance Maintenance office and on-call phone Signal unit + Text messageEach state switches on the signal unit and sends a text with its own wording to the person on call.
A compressor fault is known at once, at night too. The person on call receives a text moments after the contact opens — before the pressure drop stops the production lines.
A simplified functional diagram.
03 / Installation components
Devices in this configuration
An example selection — the number of devices depends on the site.
RSX-K02
LX receiver in the maintenance office: each alarm state switches one of the two NO/NC relays, and the transmitter gets a receipt confirmation for each transmission. 12 V DC supply.
Quantity: 1
SWR-108
Light-and-sound signal unit in the maintenance office with a volume knob: the alarm is clearly audible without drowning out the office’s work. 12 V DC.
Quantity: 1
MPU-121
Relay module next to the receiver, one per channel: separates the GSM transmitter’s input from the signal unit circuit, so that the same state switches on the signal unit and reaches the GSM input.
Quantity: 2
ATG-SG4set
GSM transmitter, 2G/4G/LTE, in a housing with a power supply: each of the two states fed to an input sends a text or a CLIP call to the maintenance staff on call.
Quantity: 1
K-5
Cable for programming the GSM transmitter from a computer: on-call numbers, message texts and input assignment. Needed at commissioning.
Quantity: 1
Installation component
12 V DC power supply
Power supply in the maintenance office for the LX receiver, the signal unit and both relay modules — all of them run on 12 V DC.
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?
Faults known at once
The person on call receives a text moments after the contact opens, at night and at weekends too — before the pressure drop stops the production lines.
No trenching
LX radio carries both states across the site without a cable, crossings under internal roads or disruption to traffic.
Confirmed receipt
The receiver confirms every transmission to the transmitter — the link is two-way, so the transmitter does not send blind as with an ordinary radio link.
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 compressor controller must provide potential-free NC contacts that open on alarm; a voltage output needs an isolating relay.
- The radio passes on the state reported by the controller and measures nothing itself; an LX confirmation means the transmission was received, not that the compressors are running.
- A range test from the compressor house to the maintenance office past the hall, mobile coverage where the GSM transmitter will be, and backup power if the notification must work during a power cut in the office.
- Temperature at the transmitter: it works between −10 and +55°C, so it is mounted outside the compressor enclosure, away from the hot-air outlet.
- The on-call list and message texts, plus a periodic alarm test and replacement of the transmitter battery on the maintenance department’s schedule.
Example configuration — it needs a technical selection for your site.
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