Measurement systems and calibration

Calibration services for Arizona manufacturers

QEPITOME LLC calibrates gauges, test rigs and sensor chains, and it runs the uncertainty budgets, certificate management and recall scheduling that keep a calibration program honest. Six services, one bench, every reading under a stated tolerance.

The bench run

Six services, each with its own reference set and certificate

Every service below is offered from the laboratory at 8702 W Jefferson St, Peoria, AZ 85345-9407, United States. Book any one of them through the contact page, or call +15136544527 to discuss a route.

Dimensional Calibration

Dimensional calibration is the heart of the laboratory. Micrometers, calipers, height gauges, bore gauges, depth gauges, pin gauges, thread plugs and surface plates are compared against lapped gauge blocks on a granite surface plate. The blocks themselves are wrung into a stack that matches the dimension under test, so the reference grows in the same single steps that the instrument is expected to read.

We check the parameters that matter to the drawing: step accuracy over the measuring range, flatness and parallelism of measuring faces, zero setting, and the repeatability of the reading. For surface plates we report flatness against the relevant grade. For thread gauges we verify pitch diameter and lead within the stated class. Each result is written with the reference stack noted, so a customer can reproduce the route.

Torque and Force Calibration

Torque and force calibration protects joints, fasteners and press loads. Click wrenches, beam wrenches, torque drivers, multipliers, load cells and force gauges are run against deadweight standards or reference transducers at the points that matter to the process, not just at one convenient setting. A wrench that reads correctly at its midpoint can still fail at the low end, and the calibration is designed to expose that.

We record the as-found drift at each point so a tightening program can be corrected before scrap is produced. The as-left result is captured after any adjustment, and both sets of readings appear on the certificate. Reference transducers carry current traceability and are recalibrated on their own schedule, so the chain behind every torque number is complete.

Pressure and Vacuum Calibration

Pressure and vacuum calibration covers gauges, transmitters, switches, relief valves, vacuum sensors and differential devices. Instruments are stepped up and down a reference scale so hysteresis, dead band and repeatability become visible. A single-point check can hide a switch that trips late or a transmitter that lags on the way down, so the route is designed to catch both directions.

Switches are tested for set point and reset point. Relief valves are checked for cracking pressure where the test stand allows. Vacuum instruments are compared against a reference vacuum sensor across the working range. The environmental conditions are recorded during the run, because a pressure reading depends on more than the pressure alone. Results flow straight into the uncertainty budget for the instrument.

Electrical and Temperature Calibration

Electrical and temperature calibration ties the shop floor to the control system. Multimeters, clamp meters, insulation testers, process calibrators, thermocouples, RTDs, thermometers, chart recorders and data loggers are checked against electrical references and against temperature baths or dry block calibrators. We cover the loop from sensor to display so a temperature reading can be trusted end to end.

Thermocouples and RTDs are compared at the points that the process uses, with the reference junction handled correctly. Transmitters are checked for span and zero, and controllers are verified where the customer wants the whole loop included. The certificate states the reference, the bath stability, the immersion conditions and the expanded uncertainty, so the reading can be defended in an audit.

Uncertainty Budgets and Certificates

Uncertainty budgets and certificates turn raw readings into decisions. For every calibration, QEPITOME LLC builds a budget that combines the reference standard, the resolution of the instrument, the repeatability of the readings, the environmental contribution and any other influence that matters. Those contributions are combined and expanded to a stated confidence level, producing one figure that describes how well the instrument was actually measured.

The certificate then states the as-found and as-left readings, the reference used and its traceability, the environmental conditions, the expanded uncertainty and a clear pass or fail decision against the declared tolerance. A reading without an uncertainty is only half a result, and we do not issue half results. Where an instrument fails, the certificate says so and the laboratory recommends repair, adjustment or replacement.

Recall Scheduling and Asset Registry

Recall scheduling and asset registry keep a calibration program from decaying into a drawer of old paperwork. Every instrument calibrated by QEPITOME LLC can be entered into a registry with its identifier, owner, location, calibration interval, last result and next due date. The registry is the single source of truth for what is calibrated, what is overdue and what is coming up.

The scheduler issues recall notices before each due date, so an instrument never reaches the floor with a stale sticker. Intervals can be tightened for a critical gauge and extended for a low-risk one, based on calibration history rather than habit. When an auditor asks for the status of a gauge, the answer is a dated record rather than a guess.

Process overview

How a job moves across the bench

The same four steps apply to every instrument, from a single micrometer to a rack of transducers.

One — Intake and identification

The instrument is logged with its identifier, owner, stated tolerance and condition on arrival. Any existing damage is photographed and noted before work begins.

Two — Route and stabilisation

A calibration route is chosen from the drawing, the tool tag or the customer specification. The instrument is left to stabilise in the controlled room so temperature and humidity do not colour the result.

Three — Comparison and capture

The instrument is read against the reference at each required point, usually up and down the scale. Every number and every environmental condition is captured as it happens.

Four — Uncertainty and decision

The uncertainty is computed, the deviation is compared against the tolerance, and the certificate is issued with a pass or fail statement. The result is entered into the asset registry.

What you receive

Deliverables on every job

Each job returns a certificate that names the instrument, states the reference used, gives the as-found and as-left readings, records the environment, states the expanded uncertainty and closes with a pass or fail decision. Where a repair or adjustment was made, the certificate notes it. Where an instrument cannot be calibrated safely, we say so and explain why.

The record is written for an outside reader. A quality engineer, a customer auditor or a registrar can follow the certificate back to the reference standard without needing to call the laboratory for context.

The asset registry entry keeps the same information in a searchable form, linked to the calibration interval and the next due date. Recall notices are issued from that entry, and the calibration history builds up over time so intervals can be reviewed with evidence.

If you want to start a program or bring an existing one under control, contact the laboratory or call +15136544527. QEPITOME LLC will quote the route, the turnaround and the certificate format before any work begins.

Ready to book a service

Tell us the instrument, the tolerance and the due date. We will confirm the route and the turnaround, then add it to the recall schedule.

Contact QEPITOME LLC