SR1 static stem

Quick Answer: The SR1 Static Stem is a fixed support rod, listed under the model code SR1, that stands upright on a hotplate stirrer to carry a temperature controller, probe or clamp above the vessel. In the listing photograph the stem rises from the back of a hotplate stirrer and holds a controller box with its probe dipping into the vessel.

Specifications

The SR1 Static Stem in Use

“Stem” is another word for the upright rod of a stand, and “static” means it stays fixed once fitted. The photograph for the SR1 static stem is more useful than most because it shows the rod at work: it stands vertically at the rear of a blue and white hotplate stirrer, a small controller unit is clamped part-way up, and the controller’s probe curves down into the vessel on the top plate. A stem mounted on the stirrer itself keeps the whole set-up compact and moves with the stirrer as one unit.

External temperature controllers for hotplate stirrers need exactly this kind of support. The controller reads the liquid temperature through its probe and switches the heating to hold a setpoint, so the probe has to stay at the same depth throughout the run. A stem fixed to the stirrer does that better than a separate stand that can be knocked out of line.

The model code SR1 identifies the part within a stirrer maker’s accessory range. The listing does not give the rod length, diameter or which stirrer models accept it.

Care & Handling

• Fit the stem with the stirrer switched off and cool
• Route probe cables away from the hot top plate
• Keep the load light; the stem is meant for controllers and probes, not heavy glassware
• Clean splashes from the stem promptly to keep clamps from slipping

Applications

• Carrying a temperature controller and probe for closed-loop heating on a hotplate stirrer
• Holding a PTFE temperature probe in a corrosive solution
• Supporting a thermometer clamp during a heating or cooling curve practical
• Keeping a compact stirring station tidy on a crowded bench

Why Choose LabEquip

The SR1 static stem is ordered mostly by labs fitting an external temperature controller to a hotplate stirrer from the same maker’s range. LabEquip can confirm that SR1 suits your stirrer and quote it with the probe and controller parts you need from our general lab products range; contact us with your stirrer model.

Frequently Asked Questions

What is the SR1 static stem?

It is a fixed support rod, sold under the model code SR1, that mounts upright on a hotplate stirrer to carry a temperature controller, probe or light clamp over the vessel.

Which stirrers does the SR1 stem fit?

SR1 belongs to a specific maker’s accessory range and fits the stirrers designed for it. Send us your stirrer’s make and model and we will confirm the fit.

Why mount a controller on a stem rather than a retort stand?

A stem fixed to the stirrer keeps the probe at a constant depth and moves with the stirrer, so the set-up is less likely to be knocked out of position.

Can I hang a condenser from the SR1 stem?

It is designed for light loads such as controllers, probes and thermometers. Condensers and large flasks should go on a retort stand with a heavy base.

Does the stem get hot during heating?

The lower part of the stem sits near the heated plate and can become warm. Handle it by the upper section and let the stirrer cool before removing it.

What else is usually ordered with the SR1 stem?

Labs typically add the matching temperature controller and a probe, such as a stainless steel or PTFE-sheathed probe, depending on the chemicals being heated.

Last Updated: September 2026