Is the BAPI BA/RLD refrigerant leak detector intended for life safety or critical ppm measurement?

No. It is intended for refrigerant leak and spill monitoring with BAS alarming and trending. It is not intended for critical ppm measurement or life safety applications.

RLD-D-BB) | BAS Refrigerant Leak Monitoring

Q: How long should I wait after power-up before alarming?

Use a warm-up inhibit before enabling alarms. Five minutes is a common starting point, then refine based on site conditions.

Posted by AJ Phillips on 2nd Mar 2026

BAPI Refrigerant Leak Detector for BAS. How to Monitor HVAC/R Leaks with BA/RLD and BA/RLD-D-BB

Refrigerant leaks are expensive. They reduce system capacity, drive up energy use, and can create compliance and safety concerns depending on the application. For building automation teams, one of the best upgrades is installing a refrigerant leak detector that feeds the BAS a clean analog signal. You can alarm, trend, and respond early before a minor leak becomes a major service call.

Quick links. Buy from ZOT Supply

What the BAPI refrigerant leak detector does

The BAPI BA/RLD family uses a sensing element whose resistance changes as refrigerant concentration changes. The detector outputs a proportional analog voltage signal that your controller can read and trend. These devices are designed for leak and spill monitoring. They are not intended for critical ppm measurement or life safety use.

Which model should you use?

BA/RLD (Rough Service). Best for mechanical rooms and equipment spaces

Choose the rough service model when you want to monitor areas where leaks settle and linger near the equipment. This includes chiller plants, VRF/VRV closets, refrigeration rack rooms, walk-in cooler or freezer machinery areas, and mechanical rooms.

Mount low when possible. Many refrigerants are heavier than air and settle near the floor.
Keep airflow clear around the unit. Avoid mounting in blocked or stagnant pockets.
Use trending to catch gradual increases before the leak becomes obvious.

BA/RLD-D-BB (Duct). Best for return air and duct detection

Choose the duct model when you want to detect refrigerant in an air stream. Return air monitoring can provide early warning, especially when equipment is in an enclosed area and the return air is the first place the gas shows up.

Mount the aspiration tube in a location with stable airflow.
Avoid placing it right at elbows, dampers, or restrictions where airflow is turbulent.

Where to place sensors. Quick visual guide

Mechanical rooms often benefit from low placement near equipment. Duct detection works best in stable airflow. Avoid corners and dead zones where air does not mix.

Wiring and BAS integration notes

These models are typically wired as an analog voltage input into your controller. Use good wiring practices. Keep signal wiring separated from high-voltage conductors when possible. Trend the signal so you can see gradual changes.

Example BAS sequence. Simple and effective

Use this as a starting point. Adjust thresholds based on site conditions, ventilation, and historical trends.

Refrigerant Leak Detector (AI: 0 to 4.8 V)

1) Power-up inhibit
   - Inhibit alarms for 5 minutes after power is applied or after controller restart.

2) Minimum detection logic
   - If AI >= 0.50 V for 60 seconds, set "Leak Suspected" = TRUE.
   - Generate an alarm notification (email, text, or BAS event).

3) Trending
   - Trend AI value every 5 to 15 minutes.
   - Trend "Leak Suspected" state changes.

4) Escalation
   - If AI is rising over time (example: +0.20 V in 30 minutes), escalate priority.
   - Trigger work order or on-call dispatch logic if available.

5) Reset logic
   - Clear "Leak Suspected" only after AI < 0.40 V for 10 minutes.
   - This prevents chatter around the threshold.

Detectable refrigerants. Most searched list

Common refrigerants customers ask about:

R-410A
R-404A
R-134a
R-32
R-22
R-1234yf

For the full detectable refrigerants list, link your hosted PDF here: Detectable Refrigerants Overview (PDF) (Replace this link with your ZOT-hosted PDF URL for “Detectable_Refrigerants_Overview”.)

Commissioning and maintenance

Quick bump test

A quick bump test verifies the sensor responds. Power the unit, allow it to stabilize, then apply a known test gas or a suitable duster product per manufacturer guidance. Confirm the output rises significantly and alarms trigger as expected.

Replacement element

If your site requires scheduled maintenance, consider stocking a replacement sensing element. Add your internal ZOT product link here if you have it: BA/RLD-EL replacement element (Replace with the correct ZOT Supply URL if available.)

Where to buy. Inbound links

Manufacturer reference. Outbound link to BAPI

For the manufacturer overview and configuration details, reference BAPI here: BAPI Refrigerant Leak Detector and Transmitter product page

FAQ

Is this intended for life safety?

No. Use it for refrigerant leak and spill monitoring with BAS alarming and trending. Follow all applicable codes and safety requirements for the site.

How long should I wait after power-up before alarming?

Use a short warm-up inhibit. Five minutes is a common starting point.

What alarm threshold should I start with?

Start around 0.50 V as a minimum detection threshold, then refine using trend data and site conditions.