Bluelab Sample Tube and Fittings

Mount Probes Safely in a Reservoir Sample Line, Up to 15 psi

Hanging probes in a reservoir is not ideal: the pH probe is delicate, moving water flexes cables until they fail, and flood-and-drain systems can leave probes high and dry. The Sample Tube holds probes in a sample line fed from the reservoir, so they always measure fresh solution. Shut-off valves let you remove probes for cleaning and calibration without draining the system.

It suits commercial reservoirs deeper than standard 2 m probe cables can reach, and any setup where the controller sits away from the tank.

Key Features & Benefits

• Remote reservoirs — ideal where probes need to sit up to 2 m / 6.6 ft from the tank.
• Easy probe access — shut-off valves for cleaning and calibration.
• Manual sample tap — draw solution for spot testing.
• Leak-proof probe hold — secure fittings for a low-pressure system, max 15 psi.

Who Should Use the Sample Tube

Owners of the Bluelab Guardian Monitor Wi-Fi or Pro Controller Wi-Fi with deep, remote or flood-and-drain reservoirs.

About Bluelab Sample Tube

Bluelab supplies the Sample Tube with fittings for quick installation on a reservoir sample line. It is a low-pressure system; do not exceed 15 psi.

Frequently Asked Questions

Why not hang probes in the reservoir?

Moving water flexes probe cables and can cause premature cable failure, the pH probe can be damaged, and levels in flood-and-drain systems can leave probes exposed. A sample tube keeps probes secure and submerged.

What pressure can it handle?

The Sample Tube is a low-pressure system with a maximum of 15 psi. Do not exceed that rating.

Which devices is it compatible with?

Bluelab lists the Guardian Monitor Wi-Fi (BGUSTD02) and Pro Controller Wi-Fi (BCTPRC02).

Can I take a sample for manual testing?

Yes. A manual sample tap lets you draw solution for spot checks with a handheld meter.