There is no separate “calibration machine” for the Honeywell XNX gas transmitter. Calibration is done with a Honeywell field calibration kit, which costs about $543 to $765 depending on the kit and dealer, plus a cylinder of certified calibration gas at roughly $130 to $240. A first-time setup for one sensor type therefore runs about $700 to $1,000 before labour.
What you actually need to calibrate an XNX
The XNX is a fixed universal gas transmitter: it is mounted on site and connects to toxic, oxygen or combustible gas sensors. Calibrating it means flowing a known concentration of gas over the sensor at a controlled rate and setting the zero and span through the transmitter’s menu. For that you need three things:
- A calibration kit: tubing, a flow regulator, a flow adaptor that fits the sensor, and a carrying case. The toxic kit also includes a calibration cup.
- Calibration gas: a certified cylinder matching the sensor’s gas and range, for example 50% LEL methane or 25 ppm hydrogen sulfide (H2S).
- Trained staff or a service contractor to carry out the procedure in Honeywell’s manual and record the results.
Automatic docking stations, such as Honeywell BW’s IntelliDoX, are designed for portable gas detectors carried by workers, not for fixed transmitters like the XNX, so they are not an alternative here.
XNX calibration kit prices
| Part number | Use | Dealer price | Dealer |
|---|---|---|---|
| XNXCOMBKit | Combustible gas sensors; 0.5 L/min regulator | $543.00 / $655.40 / $665 | Instrumart / Lesman / Gas Detectors USA |
| XNXTOXKit | Most toxic and oxygen sensors; 0.3 L/min regulator, calibration cup | $543.00 / $629.88 | Instrumart / Lesman and JJS Technical |
| XNXTOXKit2 | HCN, Cl2, HF, NH3 and HCl sensors | $633.00 / $734.28 / $764.44 | Instrumart / JJS Technical / Lesman |
Dealer web prices checked November 2026. None of the kits includes calibration gas.
Why the same kit shows different prices: Instrumart notes that Honeywell added a 16% surcharge to this product from 4 August 2025, charged as a separate line on the order. Its $543 price plus 16% is exactly $629.88, the price Lesman and JJS Technical show for the XNXTOXKit, and its $633 TOXKit2 price plus 16% is exactly JJS Technical’s $734.28. So the gap between dealers is mostly the surcharge, shown either inside the price or added at checkout. Compare final order totals, not list prices.
Calibration gas prices
| Gas | Cylinder | Price | Seller |
|---|---|---|---|
| 50% LEL methane | 34 L | $132.00 | All Safe Industries (RAE Systems by Honeywell) |
| 25 ppm H2S, nitrogen balance | 58 L | $140.95 | USABlueBook |
| 4-gas mix: CO, H2S, 50% LEL methane, O2 | 34 L | $210.99 | Zoro (Industrial Scientific) |
| 4-gas mix: CO, H2S, 50% methane, O2 | 58 L | $239.95 | USABlueBook |
| 10 ppm chlorine | 58 L | $399.95 | USABlueBook |
A fixed XNX sensor normally needs the single gas it measures, at the concentration its manual specifies, rather than the 4-gas mixes made for portable detectors. Reactive gases such as chlorine cost more and have shorter shelf lives, so buy them close to the calibration date.
The transmitter itself
For context, dealers list the XNX transmitter from about $927 (Lesman) to $1,144 (Instrumart) depending on configuration, before sensors. The calibration kit is a one-off purchase that serves every XNX of the same sensor type on a site, while gas is a running cost.
Buying the kit vs paying a service contractor
- Buy the kit if you have several XNX units and trained instrument technicians on site. The kit and regulator are reused, and you only replace gas.
- Use a contractor if you have only a few transmitters or need documented calibration certificates for audits. Contractors bring their own kits and gas; ask for a per-point price and what is included.
Either way, follow the calibration interval and procedure in Honeywell’s XNX technical manual and your site’s safety requirements, and keep records of each calibration.
Checklist before you order
- Which sensor types are fitted to your XNX units: combustible, standard toxic, oxygen, or the reactive gases covered by TOXKit2?
- Which gas and concentration does the manual specify for each sensor?
- Does the dealer price include Honeywell’s surcharge?
- Are the cylinder’s valve and the kit’s regulator compatible?
- What shelf life does the gas have, and is it supplied with a certificate of analysis?
FAQs
How much does it cost to calibrate an XNX gas detector? If you do it yourself, expect about $543 to $765 for the kit once, plus $130 to $400 per gas cylinder depending on the gas.
Is there an XNX calibration machine? Not as a separate product. Calibration uses Honeywell’s field calibration kits and certified gas, and is set up through the transmitter’s own menu.
Can I use a 4-gas portable detector mix? Only if it contains the right gas at the concentration the XNX sensor’s manual requires; usually a single-gas cylinder is the correct choice.
See our machine price guides and how we research prices.
Published November 2026. Sources: Instrumart XNX toxic kit and surcharge notice, Instrumart XNX combustibles kit, Lesman XNXTOXKIT2, JJS Technical XNX kits, USABlueBook calibration gas and All Safe Industries. Dealer prices change; check before ordering.
