Yes. We service and calibrate Tecweigh belt weighers, including the WY15 weigh frame and the WP20, WP25 and WP50 weigh processors, on mine and quarry sites across Australia. We’re an independent service company, not a Tecweigh dealer or agent, and we do the whole scale, not just the box on the wall.
This guide covers what a service visit includes, what we check on a Tecweigh scale in particular and what a calibration looks like. For the messages on the older processors, see Tecweigh WP20 and WP25 fault codes and calibration. For the current processor, see what the messages on a WP50 mean.
What Tecweigh equipment do we service?
Tecweigh is a US brand, and it’s common on Australian mine and quarry conveyors. On a service visit we look after:
- WY weigh frames, usually the WY15 single idler belt scale, often with its own self-storing calibration weight
- WP20 and WP25 processors, the older generations, still running on plenty of conveyors
- WP50 processors, the current model that replaced them
- Load cells (or displacement sensors on older frames) and the frame mechanicals: pivots, tie rods and mounting
- Speed sensors, and the signal conditioning card at the frame that reads them
- Calibration, fault-finding and repairs, including parts for ageing units
Tecweigh also builds weigh feeders. We look after the belt weighing gear on conveyors, which is where the WY frames and WP processors live.
We supply parts for Tecweigh and the other major belt weigher brands: a genuine part where it’s available, or a suitable alternative, with compatibility confirmed and the part identified on the quote.
What do we check on a Tecweigh scale that’s easy to miss?
Work on or near a conveyor, or inside an electrical enclosure, needs isolation under your site’s procedures and trained, authorised people. If that’s not you, stop and call us on 1300 101 666.
The as-found settings, before we touch anything. The stored configuration is what makes the scale read the number it reads. If a fault later turns out to be a changed setting rather than a mechanical problem, that record is what tells us. It matters more on a WP20, which can rebuild its settings from a backup copy or factory defaults after a memory fault.
Where the speed signal lands. On a WP20 or WP50 the speed sensor doesn’t wire into the processor at all. It lands on the signal conditioning card at the weigh frame, which reads speed and load and sends both back over a serial link. That card is also where the sensor type is set. A WP25 can be wired either way, so we check which arrangement is in front of us. A lot of speed faults come from a replacement sensor that doesn’t suit those settings, or a speed span that was never re-checked against the belt. Before we leave, we confirm the displayed speed against a measured check; more than about 2% out needs investigating.
Where a sensor is worn out, our USR speed sensor is an option. It mounts on the tail drum or a trailing arm, and its multiple outputs mean one sensor can feed two belt weighers, or a belt weigher plus the conveyor underspeed. We’ll confirm it suits the input before we fit it.
The load signal at the frame. Reading the raw signal at the weigh frame tells us whether a suspect number comes from the mechanicals (build-up, a sticking pivot, a tired load cell) or from the processor and its calibration.
The two settings that hide tonnes. A dead band set too wide, or automatic zero tracking on a light feed, stops real tonnes being counted without any message on the screen. We read both back on every visit. See why a Tecweigh under-reads at low rate.
One of our technicians spent fifteen years on the manufacturing and commissioning side of this equipment before joining us, so we know the WY frames and WP processors and the reasons behind their settings.
What does a Tecweigh calibration look like?
A routine maintenance calibration runs the same shape as on any belt weigher:
- Belt speed, checked against a timed run over a measured length. After a new belt or splice, we re-measure speed and length and re-enter them.
- Zero on a clean, empty belt, run over whole belt revolutions so variation around the belt averages out.
- Span against a known reference: the self-storing calibration weight, a static test weight or a chain.
- Material comparison where it’s warranted, checking the total against a known weighbridge figure.
The numbers we work to: repeat span runs within about 0.1%, and a routine span that has moved more than about 0.25% needs attention.
Who adjusts what. On our service visits we adjust the zero and span when the checks show it’s needed. Between visits, site should run a zero about every two weeks and after a big change in the weather, and check the span but record it rather than accepting it. We recommend a service calibration every quarter so the scale keeps up with the seasons.
We record as-found figures before we change anything and as-left figures after. Those figures, the processor configuration and what we found go into AIMM, our asset management system, so every Tecweigh scale we look after has a permanent record and a due date you can see, at no extra cost. This is maintenance calibration for production and stock reconciliation, not trade verification. For the detail on each method, see belt weigher calibration methods.
What goes wrong on Tecweigh scales?
Mostly the same things that go wrong on any belt weigher, and they usually sit in the mechanicals and field wiring rather than the processor:
- Build-up on the belt, idlers or weigh frame, which quietly shifts the zero
- Speed sensor wear or slip, especially on wet or dusty belts, and seizing bearings
- Moisture and corrosion in the junction box, a frequent cause of intermittent or lost signals
- Loose terminals worked free by conveyor vibration
See common belt weigher faults and our speed sensors guide.
Why use an independent on a mixed-brand site?
Very few sites run one brand. Tecweigh on some conveyors, Thermo Ramsey on others and Schenck somewhere else is common, often installed at different times by different people. We look after the lot with one team and one point of contact, and one set of records in AIMM. We’re not tied to a product line, so we’ll tell you straight whether to repair it or replace it. If you’re weighing up a WP50, see what changes on a WP50.
Need a manual for your equipment?
A Tecweigh scale has two documents: one for the WY frame and one for the WP processor driving it. Photograph both nameplates, and tell us whether the processor is a WP20, WP25 or WP50.
Talk to us about manuals for your equipment. Send the make, model, serial number and software version (a photo of the label is fine) and we’ll help you find the right document.
When should you call us?
Call when a scale won’t calibrate or hold its zero, the totals stop agreeing with the weighbridge, a message keeps coming back after the obvious cause has been dealt with, or the scale is due and nobody has recorded as-found figures in a while. Call 1300 101 666 or email admin@accurateindustries.com.au. See booking a belt weigher service for what to send.
Frequently asked questions
Are you a Tecweigh dealer or agent?
No. We’re an independent service company with no affiliation to Tecweigh. We service and calibrate their equipment from field experience, the same way we do every other brand.
Can you still support an older WP20 or an ageing WY15?
Yes. Older units are a good part of what we do. We calibrate them, fault-find them and source parts to keep a reliable unit running.
A tech swapped our speed sensor and the scale stopped reading speed. Can you help?
Very likely the new sensor doesn’t suit the input settings on the card or processor. We’ll identify and correct it on site, and check the processor reads true belt speed before we leave.
Is this a trade verification or a maintenance calibration?
Almost every site wants a maintenance calibration, which is what this page describes. Where a scale is used for trade, that’s a separate regulated verification. We have NMI-licensed technicians for that work, so tell us what the scale is used for.