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Kirkhollow Analytical Laboratories Ltd Job KAL-ESR-4471

# Equipment service report

CLIENT

Braithe Estuary Partnership
Estuary House, Vardenne Quay
Braithe BR3 4LN

<table>
    <tr>
        <td>Job reference</td>
<td><strong>KAL-ESR-4471</strong></td>
    </tr>
<tr>
        <td>Date of visit</td>
<td><strong>29 January 2026</strong></td>
    </tr>
<tr>
        <td>Engineer</td>
<td><strong>R. Tarbert</strong></td>
    </tr>
<tr>
        <td>Instrument</td>
<td><strong>Kestrel 400 turbidity analyser</strong></td>
    </tr>
<tr>
        <td>Location</td>
<td><strong>Vardenne Quay pumping station</strong></td>
    </tr>
<tr>
        <td>Service interval</td>
<td><strong>Twelve months</strong></td>
    </tr>
</table>

### Reported fault

Intermittent baseline noise on channel 2, reported by the Partnership on 21 January. The analyser had been running without attention since the annual service in January 2025.

### Work carried out

The flow cell was removed, stripped and cleaned, and the pump tubing set replaced. The optical window was found to be lightly fouled on the inner face; it was cleaned rather than replaced, and should be inspected again at the next visit. The analyser was recalibrated against the two-point standards and left running on channel 2 for an hour before the site was handed back. The completed worksheet is bound in as page 2 of this report.

KAL-ESR-4471 Page 1 of 3


---

## Kirkhollow Analytical Laboratories Ltd FIELD SERVICE

## Service worksheet

**Job reference**: KAL-ESR-4471

**Instrument serial**: GK-2214-77

**Engineer**: **R. Tarbert**

**Date**: **29 January 2026**

### CHECKS AND READINGS

**Flow cell condition on arrival**: **Fouled, inner face**

**Flow cell pressure after service**: **2.4 bar**

**Zero drift over 30 minutes**: **0.003 mg/l**

**Span recovery against standard**: **99.4 per cent**

**Lamp hours at service**: **8,140**

**Result**: **Pass**

### Calibration certificate SR-4471/2

Analyser left in service on channel 2. Optical window to be inspected at the next visit.

### TIME ON SITE

**Arrived**: **29 January 2026, 09:15**

**Left**: **29 January 2026, 13:40**

**Chargeable time**: **4 hours 25 minutes**

**Next service due**: **January 2027**

### RECEIVED BY

**Name**: **M. Cairney**

**Position**: **Duty operator, Vardenne Quay**

**Date**: **29 January 2026**

[signature: R. Tarbert]

Engineer's signature

Service worksheet · KAL-ESR-4471 Page 2 of 3


---



Kirkhollow Analytical Laboratories Ltd Job KAL-ESR-4471

## Parts fitted

<table>
  <thead>
    <tr>
        <th>Part</th>
        <th>Code</th>
        <th>Quantity</th>
    </tr>
  </thead>
  <tbody>
    <tr>
        <td>Pump tubing set</td>
<td>PT-114</td>
<td>1</td>
    </tr>
<tr>
        <td>Flow cell O-ring, 12 mm</td>
<td>OR-0912</td>
<td>2</td>
    </tr>
<tr>
        <td>Inlet filter, 40 micron</td>
<td>IF-4004</td>
<td>1</td>
    </tr>
  </tbody>
</table>

## Declaration

The work described in this report was carried out to the standard set out in the service agreement. The analyser was left in service and calibrated. The next annual service falls due in January 2027.

<table>
    <tr>
        <td>Engineer</td>
<td><strong>R. Tarbert</strong></td>
    </tr>
<tr>
        <td>Countersigned</td>
<td><strong>Dr A. J. Prosser</strong></td>
    </tr>
<tr>
        <td>Report issued</td>
<td><strong>2 February 2026</strong></td>
    </tr>
</table>

KAL-ESR-4471 Page 3 of 3