Maintenance & Reliability · SOP

Timer Calibration For Glue Pot

This standard operating procedure details the calibration verification and adjustment of the electronic timer on glue pots used in production dispensing. Ensuring the timer delivers the correct dwell time prevents adhesive waste and joint failure.

Estimated Time

30 min

Difficulty

Intermediate

Regulation

ISO 9001

Version

1.0

Free download — no sign‑up, no email.Take this SOP to your shop floor and make it yours.

↓ PDF (print‑ready) ↓ Word (editable)

Purpose

The purpose of this procedure is to ensure the glue pot timer consistently dispenses the correct amount of adhesive by either verifying current calibration or restoring it to factory specification. Accurate timing directly affects product adhesion quality, material usage, and cycle time consistency.

Scope

This SOP applies to all production-line glue pots equipped with electronic programmable timers (model XYZ-100 and similar). It covers the annual calibration check or any on-demand verification when an operator reports inconsistent glue bead volumes. This procedure does not cover mechanical timer replacement or PLC-based systems.

Safety Precautions

LOTOLockout/tagout the electrical supply to the glue pot. Verify zero energy with a voltmeter before opening any panels.
PPEWear safety glasses and heat-resistant gloves. Glue residue and nozzle may be hot (up to 80 °C). Allow cooling to below 50 °C if handling the glue pot assembly.
BURNDo not touch the glue nozzle or heated reservoir during the procedure. Use insulated tools if near heated surfaces.

Required Tools & Materials

Digital stopwatch (0.1 s resolution, certified)
Small flathead screwdriver (for trim potentiometer)
Calibration log sheet / PM log template
Glue pot system manual (for access points and potentiometer location)
Lockout/tagout kit (padlock, hasp, tag)
Voltmeter (for zero-energy verification)
Safety glasses and heat-resistant gloves

Stop Chasing Maintenance Blindly

Track every calibration, pressure drop reading, and machine performance trend in one place. ServiceGrid logs your tasks automatically and alerts you before failure.

Try ServiceGrid →

Procedure: Step-by-Step

1 Lockout/Tagout. Turn off the glue pot main disconnect, apply a lockout padlock and tag, and test for zero voltage at the timer module terminals using a voltmeter.

2 Access timer module. Remove the control panel cover (usually 4 screws) to reveal the electronic timer. Locate the adjustment potentiometer (often labelled "TIME CAL" or "ADJ").

3 Record current setting. Note the digital display value (if visible) or the potentiometer position. Write the set point (seconds) on the calibration log sheet.

4 Perform test cycle. Re-energize the system only for the test (observe lockout procedure). Initiate a manual dispense cycle and simultaneously start the stopwatch. Measure the time from glue start to end. Repeat 3 times; record each result.

5 Adjust if necessary. If the average measured time deviates more than ±0.5 seconds from the set point, turn the potentiometer clockwise to increase or counter‑clockwise to decrease time. Make small adjustments (¼ turn) and re-test.

6 Final verification. Once the measured time matches the set point within tolerance, run three more cycles to confirm stability. Record final values on the calibration log.

7 Close out. De-energize and lockout again, replace the control panel cover, remove lockout. Restore power. Sign and date the log. Notify the shift supervisor that calibration is complete.

Timer Calibration For Glue Pot

Stop Chasing Maintenance Blindly

Software that works like your best tools.