Can Thermal Cameras See Through Glass? FLIR C3-X, Sartorius Chromatography Pumps, Sartorius Biohit Pipette Manual, and Depth Caliper Checklist

I've been a senior lab technician for 11 years. I've personally made and documented seven significant mistakes, totaling roughly $18,000 in wasted budget. This checklist is the result. If you're about to use a Sartorius chromatography pump, a Sartorius Biohit pipette, a depth caliper, or a FLIR C3-X compact thermal camera, read this first.

This is not a product review. It's a 'before you trust the reading' checklist. I use it for biopharma work, university lab support, and even maintenance jobs. Basically, every time I'm about to measure something that matters, I run the same six steps. They take less than 30 minutes combined. Skipping them takes less than a second. The last time I skipped them was September 2022, when I connected a chromatography column to a Sartorius pump without pressure testing it first. That mistake cost a $3,200 column and a 1-week delay.

Step 1: Open the Sartorius Biohit Pipette Manual Before You Pipette

I know, you've pipetted a thousand times. But the Sartorius Biohit pipette manual has the exact details for your model. Not the generic 'pipetting techniques' page. I mean the model-specific stuff: which tip cones are compatible, how far the plunger should travel, and when to lubricate the piston.

What most people don't realize is that the manual also lists the cleaning methods that won't damage the pipette. I used a laboratory detergent on a Biohit pipette once, and the manual's warning about alkaline solutions became very relevant. The piston seal swelled, the volume went inconsistent, and we had to send it for service. That was a $450 repair that I could have avoided by reading the Sartorius Biohit pipette manual for ten minutes.

• Check the tip cone for cracks, wear, or dried residue.
• Check the shaft and lower bearing for scratches.
• Set the volume to the lowest recommended value before you start. Yes, it feels like a tiny thing. Do it anyway.
• Do a visual leak test with distilled water after you fit a fresh tip.

The manual says to inspect these parts daily. I don't know a single person who does it daily. I've made it part of my Monday morning routine. The one time I skipped it? Q1 2024. A cracked cone let air into the tip, and I only found out after the results looked like noise.

Step 2: Pressure-Test Sartorius Chromatography Pumps Before You Connect Anything

Sartorius chromatography pumps are built for precise flow. But precision doesn't mean 'no air bubbles'. If the pump head is not primed, the display can show a flow rate while the actual flow is pulsing or just not happening.

My rule: before any column connection, run the pump with the bypass valve open and a pressure gauge on the outlet. Let it run for at least 60 seconds. Watch the pressure. If it spikes or drifts, find out why before you connect your expensive column.

The upside of skipping this step was saving 20 minutes. The risk was destroying a column. I kept asking myself: is 20 minutes worth potentially losing $3,200? The answer was no, but I had to learn it the hard way in September 2022. The pump had air in the inlet line. It looked fine because the system had a flow reading. When I connected the column, the pressure spiked and the column media compressed unevenly.

• Check the inlet filter is clean and fully submerged in solvent.
• Prime the pump head slowly so air bubbles don't get trapped.
• Set the pressure limit before the run, not during the run.
• Record the baseline pressure in your log.

Here's something vendors won't tell you: the 'quick start' procedure in the manual is not the validation procedure. The Sartorius chromatography pumps documentation includes a pressure test in the system validation section. That page is the one you want, not the quick start card.

Step 3: Zero Check the Depth Caliper on Its Reference Surface

A depth caliper is one of those tools that people trust because it looks simple. But the digital display can drift, the slider can get dirty, and the reference surface can have a tiny burr. The 'zero check' is not a waste of time. It's the only way to catch a damaged tool before you make a batch of bad measurements.

Do this before you measure anything: wipe the reference surface and the rod with a clean cloth, then close the caliper on its zero block. If your model doesn't have one, use a flat surface you trust. Read the display. It should show 0.000 or the equivalent inch reading. If it shows 0.003, stop. Then measure a known thickness or depth if you have a gauge block.

I once measured the depth of a machined part with a depth caliper that was zeroed to 0.003 off. The order had 14 pieces. Every one came back with a depth that was too deep by 0.003. That error cost $890 in redo plus a 1-week delay. The worst part? The caliper looked fine. The reference surface had a tiny burr that I could feel with my thumbnail but couldn't see. A zero check would have caught it in seconds.

For depth calipers, I also check the rod for bending. Roll it on a flat surface if you suspect it. A bent rod gives readings that are correct at one point and wrong everywhere else.

Step 4: Can Thermal Cameras See Through Glass? No. The FLIR C3-X Compact Thermal Camera Won't Do It Either

This is the question I hear more than any other: 'Can thermal cameras see through glass?' The short answer is no. Glass is reflective and mostly opaque in the infrared range. A thermal camera sees the surface temperature of the glass, plus a reflection of whatever is behind the camera. It does not see the object behind the glass. I do not blame anyone for asking, because the images look so clear on the screen.

The FLIR C3-X compact thermal camera is a very useful tool. It has a nice screen, a decent field of view, and it's easy to carry. It's pretty good at finding hot breakers, but only when you point it directly at them. And it follows the same physics. If you point the C3-X at a window, you'll see a blurred thermal reflection. That reflection might look hot, but it's not the room behind the window. It's the ceiling lights, your own hand, or your own body heat.

What I've learned after the vendor failure in March 2023:

If you need to measure a component behind glass, you must remove the glass. Set the emissivity before you shoot. Most common materials are between 0.85 and 0.95, but a polished metal surface can be 0.1 or lower. Use the center spot meter, not the max color scale, when comparing two objects. And don't trust the image on the screen. Save the thermal image and check the temperature values.

I didn't fully understand the glass problem until March 2023. We were checking an electrical panel that had a clear cover. The thermal image looked hot in one corner. Everyone gathered around the FLIR C3-X and started planning a shutdown. Then I put my hand behind the glass and the reflection changed. It was a phantom hot spot. The camera was seeing my hand and the room lights, not the panel.

So, can thermal cameras see through glass? No. The FLIR C3-X compact thermal camera is reliable when you use it the right way, but 'through glass' is not the right way.

Step 5: Log the Reading, Not Just the Result

For Sartorius chromatography pumps, pipettes, depth calipers, and thermal cameras, the number is not useful if you can't remember the conditions. I do not trust my memory. I've seen the same pressure reading mean two different things because the room temperature changed.

My log system is simple: date and time, instrument ID and serial number, operator name, ambient temperature when it matters, settings that were used, and the reading or result. In the past 18 months, this log has caught 47 potential errors. Not because I review it obsessively, but because I can look back and see when a Sartorius chromatography pump started losing pressure slowly.

5 minutes of verification beats 5 days of correction.

That's not a slogan. It's the exact difference between a $450 redo and a clean release.

Step 6: Do a Two-Minute Post-Use Check

The job isn't finished when you write down the reading. It's finished when the tool is ready for the next person. For a Sartorius Biohit pipette, release the tip, turn the volume dial back down to the lowest setting, and store it upright. For a Sartorius chromatography pump, flush the lines, note the final pressure, and close any open valves. For a depth caliper, clean the reference surface and put it back in its case. For the FLIR C3-X compact thermal camera, close the lens cap and charge the battery.

This step sounds like common sense, but it's the one I forget when someone asks me to 'quickly check' something. The disciplined part is not the measurement. It's the putting away.

I'll be honest: I don't always enjoy the post-use check. But I've learned that a tool left on a bench is a tool that won't be ready tomorrow. The 2-minute routine saves the 20-minute 'where did I put it' search and the 2-hour 'why is the reading off' investigation.

Common Mistakes That Still Happen

If you only remember the cautions, remember these:

• Don't assume a Sartorius chromatography pump is primed because the display shows a flow rate. Air compresses. The display can lie.
• Don't use the Sartorius Biohit pipette manual only when something breaks. Use it before you start. The answer is already written there, and it's cheaper than a repair.
• Don't trust a depth caliper without a zero check. A drop, a burr, or a dirty reference surface can make every measurement wrong.
• Don't tell yourself a thermal camera can see through glass. The FLIR C3-X compact thermal camera is a great tool when there's a clear line of sight. Glass is not a clear line of sight for infrared.

I've learned these lessons by losing money. You don't have to. This checklist is the cheapest insurance I've found in 11 years of lab work. Print it, tape it to the bench, and use it.

If one of these steps saves you from one bad order, it's worth it. Actually, it's worth a lot more than that, but I'll leave the 'cost of quality' lecture to someone else.