The Bump Test Law: Why Daily Checks are Mandatory

↠Part of the Series: Confined Space Entry 2026: The Essential Safety & Equipment Compliance Guide

The Bump Test Law: Why Daily Checks are Mandatory

You turn on your gas detector. It beeps. It shows "0". Is it working?
Maybe. Or maybe the sensor filters are blocked with mud. Maybe the sensor has failed "safe".

The only way to know is a Bump Test.

What is a Bump Test?

You expose the unit to a known concentration of gas (from a small bottle).
Pass: The unit sees the gas, displays the correct reading, and alarms trigger.
Time taken: 30 seconds.

The Law (HSE)

The HSE guidance and manufacturer specification (Crowcon/Honeywell) states that units must be bump tested before every use.
If you have an accident and the log shows the unit wasn't bump tested that day, you are liable.

Bump vs Calibration

• Bump Test: Daily. Does it work?
• Calibration: 6-Monthly. Is it accurate? (Resetting the sensors to a factory standard).

Conclusion

No Gas, No Pass. Buy a bump test kit for your van.

---

Why Professional Equipment Matters

In the field of utility surveying and safety, "cheap" equipment is arguably the most expensive mistake you can make. False readings leading to a cable strike, or a failed gas monitor in a sewer, can cost lives and millions in liability.

At Cable Locators & Survey, we stock only the verified industry standards Radiodetection, C.Scope, Abtech, and Leica. Every unit is checked, calibrated, and field-ready.

Competence & Training: The Forgotten Variable

You can buy the most expensive equipment on the market, but if the operator is untrained, it is a paperweight. Health & Safety guidance HSG47 makes it clear: equipment must be used by competent people.

We recommend a tiered training approach:

• Level 1 (Basic): Manufacturer-led familiarisation (turning it on, self-tests).
• Level 2 (User): EUSR or CITB recognised courses for Genny usage and swing technique.
• Level 3 (Manager): Data log analysis and permit-to-dig management.

Don't just tick the box ensure your team understands the physics behind the beep.

Looking After Your Lifeline

Gas Monitor Sensors

The sensors in your 4-gas monitor are chemical sponges. They can be "poisoned" by specific contaminants. Avoid using silicone sprays, WD40, or cleaning solvents near the unit, as these can permanently coat the LEL sensor, rendering it blind to methane.

Winch Cable Inspection

Pull out the full length of your fall arrest winch cable weekly. partial deployment often leads to "bird-nesting" inside the drum. Run it through a gloved hand to check for broken wire strands (meat hooks).