Customer Cases
Boundary VOC Monitoring: PID or Electrochemical — Do the Total Cost First
The point of this order was not speed. It was getting the spec right. The client leaned toward PID while needing to hold cost down — two forces pulling against each other until someone turned it into a calculation. Here is the advice we gave, and what was eventually supplied.
- 0–10 ppm Boundary VOC monitoring range
- >5 yrs Electrochemical TVOC rated life
- 1 yr PID rated life, in air
- 2× Repeat orders since delivery
Background
An environmental engineering integrator in East China was building a plant-boundary gas monitoring project. They needed a VOC sensor — 0-10 ppm range, DS4 package, thirty units to start.
The problem: the default answer, fighting the budget
PID’s bill does not stop at the purchase price. By its rated figure, service life is 1 year in air, and the UV lamp is a consumable that has to be replaced on a schedule. The purchase is only the first line.
On the other side, an electrochemical TVOC sensor covers the same 0-10 ppm range with a service life of over 5 years and no consumable parts. “We want PID” and “we need to hold cost down” kept pulling against each other.
What we did
That is the point where the two-sided problem actually came apart. The part supplied was the 04-DS4-TVOC-10-01: electrochemical TVOC, 0-10 ppm, 0.001 ppm resolution, printed solid polymer electrochemical, standard DS4 industrial package.
We already had this part available through our channel network, so it shipped straight out from a partner channel rather than waiting on a production slot.
The result
That order was around thirty units, delivered on schedule. The customer has since come back twice more. Those repeat orders are the hardest evidence in this case: whether the selection advice was right was answered with follow-on POs.
Why we can advise a customer to spend less
PID and electrochemical both sit in the same product line we carry. So this is not a question of which one to sell — it is a question of which one your duty actually needs.
Conversely, if the range runs to several hundred ppm or higher, or what you need is broad ionisable response, PID remains the better answer. The value of a selection recommendation is that it matches the duty — not that it moves the expensive item.
Frequently asked questions
Can an electrochemical VOC sensor fully replace a PID?
Does the 1-year PID figure refer to the lamp or the whole sensor?
If you advise against the pricier option, is it because the cheaper one carries better margin?
Sources
Material comes from the actual fulfilment record of this project, with customer type, region and quantity generalised under our anonymisation rules. Life and consumable figures for PID and electrochemical come from EC Sense official product pages and the DS4 series datasheets; the “electrochemical is enough” line is the selection advice we gave on that project, quoted as given. The page was reviewed before publication by someone unacquainted with the customer.