Gas Monitor GX4, Gas Detector, Gas Warning Device
The rpb Safety GX4 is an electronic multi-gas monitor for continuous monitoring of breathing air in professional respiratory protection systems. Depending on the sensor configuration, it monitors carbon monoxide, oxygen, and hydrogen sulfide, displays readings in real time, and issues a 103-dB alarm when critical concentrations are reached. Pre-calibrated sensor cartridges, as well as network and documentation features, simplify maintenance and record-keeping.
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Gas Monitor GX4, Gas Detector, Gas Warning Device is in stock and will be shipped as soon as it is available again
Questions & Help
Questions & Help
Do you have questions about one of our products, or would you like expert advice on selecting the right solution for your application?
No problem—give us a call! Tel. +49 (0) 2551 5030
Send us an email! shop@strahltechnik-express.de
Use our online chat or the contact form
Leasing & Rent-to-Own
Leasing & Rent-to-Own
We offer leasing and rent-to-own financing options exclusively to business owners, tradespeople, and the self-employed for selected products with a net merchandise value of €1,000 or more. Below you will find the key differences between these two financing options.
Leasing
In a lease, the product is made available to the lessee for use in exchange for regular lease payments. The lessor is responsible for accounting for the lease. The lease payments can generally be claimed as business expenses for tax purposes. These are gross payments, and value-added tax is charged throughout the entire term. At the end of the agreed-upon basic lease term, it is generally possible to purchase the product.
Hire Purchase
Hire purchase is economically equivalent to installment purchase. The product is capitalized on the hire purchaser’s balance sheet and depreciated in accordance with the official depreciation tables. Upon payment of the final hire purchase installment, ownership of the item is transferred to the hire purchaser. Value-added tax must be paid in full with the first hire purchase installment (transitory item).
Shipping & Delivery
Shipping & Delivery
Depending on the size, weight, and nature of our goods, they are shipped either via parcel service or freight carrier. We select the shipping method at our reasonable discretion.
The delivery times listed in the online store are non-binding estimates, unless a binding delivery date has been expressly confirmed in writing. They are based on the information available from our manufacturers, suppliers, and logistics partners at the time the order is placed.
Most of the products offered are shipped directly from the manufacturer or from external central warehouses (direct shipping). As a result, delivery times may differ from the estimated times provided. Delivery delays may occur, particularly in the event of material shortages, production delays, supply bottlenecks, force majeure, or other circumstances beyond our control.
Disclaimer:
We assume no liability for delivery delays resulting from circumstances beyond our control. This applies in particular to delays caused by manufacturers, suppliers, shipping companies, or other third parties. Liability for any resulting damages—in particular for indirect damages, consequential damages, or lost profits—is excluded to the extent permitted by law.
Partial deliveries are permitted, provided they are reasonable for the customer. This does not result in additional shipping costs, unless otherwise agreed.
The exact delivery time for an item can be provided on an individual basis upon request, either before or after the order is placed.
Please contact us by phone at +49 (0)2551 5030 or by email at shipping@strahltechnik-express.de.
In the event of significant delivery delays, we will inform the customer immediately. The customer’s mandatory statutory rights remain unaffected by this.
Gas Monitor GX4, Gas Detector, Gas Warning Device is in stock and will be shipped as soon as it is available again
rpb Safety GX4 – Smart Gas Monitor for Continuous Breathing Air Monitoring
The rpb Safety GX4 is an electronic multi-gas monitor for continuous monitoring of the supplied breathing air. It was developed for professional breathing air systems in fields such as sandblasting, painting, manufacturing, and the chemical industry.
The GX4 displays current readings in real time on a backlit display. In addition, a 103-dB alarm sounds when gas concentrations reach critical levels. Depending on the sensor configuration, carbon monoxide, oxygen, and hydrogen sulfide can be monitored.
Your Benefits at a Glance
✅ Multi-gas detection with interchangeable sensors
✅ Sensors for CO, O₂, and H₂S available
✅ A loud 103-dB alarm
✅ Backlit display with clear readings
✅ Wi-Fi and network features for remote access
✅ Data logs and air quality reports available
✅ Pre-calibrated sensor cassettes for quick replacement
✅ Sturdy housing made of reinforced polypropylene
✅ Additional connection for external alarms
📦 Package Contents
✔ Sensor configuration according to the selected model
✔ Mounting bracket
✔ Power connection
✔ Air connection
Technical Specifications
| Feature | Value |
|---|---|
| Model | GX4 |
| Measurable Gases | CO, O₂, H₂S depending on sensor configuration |
| Alarm | 103 dB(A) |
| Advertisement | backlit real-time display |
| Housing Material | reinforced polypropylene |
| Sensors | pre-calibrated replacement cartridges |
| Sensor Shelf Life | up to 2 years |
| Item Number | 08-400-G |
Remote Access and Documentation
Current measurement values can be viewed, logs downloaded, and air quality reports generated via laptop, tablet, smartphone, or network. This makes the GX4 particularly suitable for facilities with breathing air systems subject to documentation requirements.
Sensors and Maintenance
The sensor cassettes are pre-calibrated and can be replaced without the need for time-consuming device returns. RPB recommends regular functional and calibration checks. The sensors have a limited service life and must be replaced when they expire.
The GX4 is not a replacement for a breathing-air filter. It monitors gas quality, while systems such as the RPB Radex remove moisture, odors, and particles.
FAQ – Frequently Asked Questions
Which gases can the GX4 measure?
Depending on the equipment, carbon monoxide, oxygen, and hydrogen sulfide.
Can the GX4 store data?
Yes, measurement data and air quality reports can be retrieved via connected devices.
Are the sensors permanently installed?
No, they are designed as pre-calibrated interchangeable cartridges.
Payment & Security
Payment Methods
Your payment information is processed securely. We do not store credit card information and do not have access to your credit card details.
In addition, we offer many other payment methods at checkout via mollie!

