If you’re having trouble separating the pH probe from the BNC connector, you’re not alone — BNC (Bayonet Neill–Concelman) connectors can be confusing if you’ve never used one before. Here’s how to disconnect it safely and correctly.
Applies to:
- Go Direct pH Probe (GDX-PH)
- Go Direct flat pH (GDX-FPH)
- Go Direct ORP (GDX-ORP)
- Go Direct Nitrate Ion Selective Electrode (GDX-NO3)
- Flat pH (FPH-BTA)
- Any BNC-connected electrode
Background:
The Go Direct pH Probe has a detachable electrode that connects via a BNC connector. This type of connector uses a twist-lock mechanism — not a simple pull.
Instructions: How to Disconnect the Electrode
- Locate the BNC connection: It’s the metal connector where the electrode attaches to the amplifier/body of the sensor.
- Grip the outer collar of the BNC connector (not the cable or the electrode itself).
- Twist the collar about a quarter turn counter-clockwise (left). You should feel it loosen — this releases the locking mechanism.
- Pull the connector straight off. Once unlocked, it should disconnect smoothly without force.
⚠️ Do not pull without twisting first — this can damage the cable or connector.
Additional Tips:
- When reattaching, line up the two small slots on the plug with the pins on the socket, push in gently, and twist clockwise until it locks.
- If you’re unsure, here’s a video: