Cooling tower / evap condenser logbook
An operating logbook for cooling towers and evaporative condensers (HSG274 Part 1), capturing routine checks such as dip slides, biocide dosing, conductivity, pH and visual condition.
This PDF is not tagged for assistive technology. Use the accessible HTML worksheet below to complete it online, or use the structured CSV.
Fill in online
Complete this worksheet online
- Use only with the current system-specific written scheme and HSG274 Part 1 specialist review.
- Record treatment, analytical results, operating conditions, actions and notification evidence at the frequencies set for the installation.
No values are sent to Legionella.io or stored by this page. They remain in this browser tab unless you deliberately export or print them.
Enter the date.
Enter the tower / system id, or leave it blank if not known.
Enter the dip slide result, or leave it blank if not known.
Enter the biocide dosed (y/n), or leave it blank if not known.
Enter the conductivity µs/cm, or leave it blank if not known.
Enter the ph, or leave it blank if not known.
Enter the visual condition, or leave it blank if not known.
Keep it short and avoid personal data.
Enter the initials, or leave it blank if not known.
| Date | Tower / system ID | Dip slide result | Biocide dosed (Y/N) | Conductivity µS/cm | pH | Visual condition | Action taken | Initials |
|---|---|---|---|---|---|---|---|---|
| 2026-06-10 | CT-01 (roof) | Satisfactory | Y | 2100 | 8.2 | Clean; no biofilm | None required | AB |
| 2026-06-10 | CT-02 (roof) | Elevated: resample | Y | 2600 | 8.4 | Light slime on pack | Manual dose; clean; resample | CD |
Sample rows are illustrative. Download the PDF for a clean print-ready form, or the CSV to fill in digitally.
How to use it
- Use as the routine operating log for each cooling tower or evaporative condenser, recording the weekly and other checks set by your written scheme and HSG274 Part 1.
- Record biocide dosing, microbiological dip-slide results, conductivity/bleed and pH so treatment performance can be trended.
- Note the visual condition of the pack, drift eliminators and water, and log any cleaning or corrective action taken.
- Compare readings against the control limits in your treatment programme and HSG274 rather than assumed figures, and escalate persistent out-of-range results.
Background: Cooling tower logbook and inspection checklist: what to record and how often
"Cooling tower / evap condenser logbook (free template)." Legionella.io. https://legionella.io/templates/cooling-tower-logbook/
Free to reuse under CC BY 4.0: quote, adapt or republish with attribution and a link back to the original.