Should you buy the benchtop or the floor standing instrument?

What the larger platform genuinely buys you, what the benchtop wins on beyond floor area, the nine questions that settle it, and the access and clearance checks that have to happen before the order rather than after delivery.

A department writes a tender for the benchtop version because the room is small. The instrument arrives, and within a year the throughput it actually needs turns out to exist only on the floor standing model. The floor standing model would have fitted, had the storage cupboard in the corner gone somewhere else.

What the larger platform actually buys

• A larger sample chamber, an autosampler, and the throughput that comes with both.
• More channels, more power, a larger vacuum system, or a wider operating range.
• Better thermal and mechanical stability, because there is mass and internal space to manage both properly.
• Room for options bought later. This is often the real argument, and it is worth asking which options need the larger platform from day one.
• Internal access for service, which shortens every repair for the life of the instrument.
• A longer working life under continuous heavy use, which a benchtop unit run at full duty will not match.

What the benchtop genuinely wins

• Floor area, and floor loading in a building that was never designed as a laboratory.
• No plinth, no foundation, no builder, and therefore no separate work package.
• It can be relocated, which matters in an institution that reorganises rooms every few years.
• Lower power and cooling demand, which keeps it off the three phase board and out of the generator sizing calculation.
• Often no facility water, no exhaust and no compressed air, which is three contracts avoided.
• Faster installation and shorter commissioning.
• It fits through the door.

That last point is not a joke. Measure the access route before ordering anything floor standing: door width and frame, lift car dimensions and rated capacity, the turn at the head of the stairs, and the corridor at its narrowest corner. Instruments have reached Bangladeshi campuses and then spent weeks in a corridor while a window was removed to get them in. Ask the supplier to confirm crate dimensions and crated weight rather than only the instrument's own figures, because the crate is what has to go round the corner.

The questions that actually decide it

1. What throughput do you need now, and what will you need in three years? Answer honestly. A large platform bought for demand that never arrives is worse value than a benchtop that fills up.
2. Is the benchtop upgradeable, and to what? Ask which options can be retrofitted and which require the larger platform from the start.
3. What is the floor loading, and does the slab take it? For anything heavy on an upper floor, that needs a structural opinion rather than an assumption.
4. What is the access route, in centimetres and kilograms, including the crate?
5. Which services does it need: three phase supply, facility or chilled water, exhaust to outside, compressed air, gases? Each is a separate contractor and a separate delay.
6. What are its ambient temperature and humidity limits, and can the room hold them through a May afternoon and a September morning?
7. How much service clearance does it need on each side? This is the specification nobody reads and everybody later regrets.
8. What does it cost per sample to run, including consumables? A cheaper instrument with expensive consumables is not a cheaper instrument.
9. Who will operate it, how often, and does that person exist yet?

The mistakes worth naming

• Choosing the benchtop to fit a room that could have been changed. Moving a cupboard costs less than living with insufficient capacity for a decade.
• Choosing floor standing because it looks serious, then running it twice a month. Utilisation is what justifies the running cost, and an idle large instrument attracts the wrong kind of attention at budget time.
• Ignoring the service clearance, so that the engineer cannot remove a side panel without four people and an afternoon.
• Forgetting that a floor standing instrument usually arrives with a power requirement, a cooling requirement and an exhaust requirement, and that those are three separate scopes of work which all have to be finished before the commissioning engineer lands.
• Buying the benchtop and then buying a second one two years later, which costs more than the floor standing unit would have and occupies more bench than either.

Draw the room to scale, with the service clearances shaded and the access route marked, before you decide. Two hours with a tape measure and a floor plan has rescued more instrument purchases than any specification comparison.

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