Munro L60iF - User Manual

Munro Instruments, 44-45 Burnt Mill, Elizabeth Way, Harlow, Essex, CM20 2HU, UK
Email info@munroinstruments.com Phone +44 (0) 20 8551 7000 www.munroinstruments.com
Registered in England 06965050 Vat: GB 977 7939 30.
L60iF
Large Vol
ume Air Sampler
Instruction Manual

Summary

Introduction

Introduction

Provides an overview of the L60iF's purpose and operational approach.

Specifications

Flow Rate and Accuracy

Details nominal flow rate, factors affecting it, and measurement accuracy.

Display and Controls

Describes the Vacuum Fluorescent display, operator, and supervisory modes.

Technical Specifications

Covers display resolution, calibration methods, prime mover, motor, dimensions, and weight.

Accessories

Lists available optional accessories for the L60iF sampler.

Installation and Operation

Installation and Preparation

Instructions for initial setup, power connection, and preparing for sampling.

Test Routines and Operation

Selection of test routines, running tests, and interpreting results.

Alarms, Modes, and Filters

Management of alarms, volume display, auto-restart, test modes, and filter selection.

Taking a Sample and Alarm Codes

Step-by-step guide for taking a sample and understanding alarm codes.

Technical Description

Technical Description

Explains the L60iF's internal workings, pressure sensing, airflow calculation, and cooling system.

Maintenance, Servicing, and Fault Location

Regular Maintenance

Procedures for routine cleaning, filter changes, and general upkeep.

Servicing and Fault Finding

Guidance on pump servicing, fault identification, and troubleshooting common issues.

Re-calibration

Basic Re-calibration Procedure

Step-by-step instructions for performing basic re-calibration of the sampler.

Flow and Temperature Calibration

Detailed procedure for calibrating flow rates and temperature compensation.

Calibration Checks and Compensation

How to check calibration accuracy and verify temperature compensation.

Order Codes and Training

Order Codes

List of product codes for various L60iF versions and accessories.

Training Courses

Information on available training programs for sampler maintenance and calibration.

Diagnostic Mode

Accessing Diagnostics Mode

Instructions for entering the diagnostic mode using specific button combinations.

Diagnostic Data and Calibration Check

Explanation of diagnostic displays and the calibration check procedure.

Appendices

Temperature Compensation and Accuracy

Details on the temperature compensation algorithm and reading accuracy.

Firmware Updates

Step-by-step guide for replacing the Eprom to update instrument firmware.

Menus and Flow Charts

Operator and Supervisor Menus

Flow charts illustrating navigation within operator and supervisor menus.

Diagnostics and Calibration Menus

Flow charts detailing diagnostic and calibration menu structures.

Modification Record

Modification Record

Lists historical modifications and updates made to the L60iF instrument.

Overview

1. Usage Features
2. Maintenance Features

The Munro Instruments L60iF is a large volume air sampler designed for accurate measurement of pollution in the workplace environment. Unlike traditional samplers that stabilize flow rate, the L60iF focuses on precisely measuring the volume of air sampled, even as flow rates fluctuate due to factors like filter restriction, pollution levels, power supply variations, or pump performance changes. It achieves this by measuring the average flow rate over short intervals (typically one second) and accumulating the calculated volume, ensuring that flow rate changes are automatically accounted for over longer sampling periods.

The L60iF utilizes a Munro Instruments L60 Pump and Motor unit as its prime mover, known for its high specification due to continuous improvements in motor design and pump part manufacturing. Flow rate is determined by measuring the pressure drop across an orifice in the airline. An electronic signal derived from this pressure drop is then processed to display the flow rate and calculate the total sampled volume.

The device is controlled via a Vacuum Fluorescent display and four directional buttons (left, up, down, right). The display shows the current function of each button, allowing operators to run selected tests and view results, including how a test concluded. If power is interrupted during a test, the L60iF is designed to resume the test once power is restored, subject to certain conditions.

For supervisors, a dedicated mode allows for setting up various test types and adjusting other parameters. The L60iF can be calibrated against a traceable flow meter using a built-in routine. Additionally, a comprehensive diagnostic mode provides access to the sampler's history and complete calibration data.

The pump and motor are cooled by an internal fan, with incoming air filtered at the inlet to prevent dust accumulation. The sampler's exterior is designed with minimal corners and recesses for easy decontamination. Maintenance is also simplified, with the front panel removable for vane replacement without needing to remove the entire pump and motor assembly. The cooling fan is protected by an easily cleaned and replaceable gauze filter.

Usage Features:

The L60iF offers several operational modes and features to cater to different sampling needs:

• Operator Mode: This is the default mode upon startup. Operators can initiate programmed tests or view the results of the last test. When a test is selected, the display shows the test type and, upon completion, the results. Tests can be canceled by switching off the sampler.
• Supervisory Mode: Accessed by holding the Up and Down keys while powering on, this mode allows supervisors to configure test routines and other parameters.
  • Test Modes: Five operating modes are available:
    1. Timed Test: Starts immediately and runs for a selected duration.
    2. Volume Test: Starts immediately and runs until a selected volume of air has been sampled.
    3. Delayed Timed Test: Starts at a preset time and runs for a selected duration.
    4. Delayed Volume Test: Starts at a preset time and runs until a selected volume of air has been sampled.
    5. Open-Ended Test: Starts immediately and runs until manually stopped by the operator.
  • Test Results: Supervisors can view results from the last 250 tests. Each result includes a code indicating how the test ended (e.g., OK for uninterrupted, PF for power failure, LF for low flow alarm, HF for high flow alarm, TL for time limit, OV for volume limit).
  • Low and High Flow Alarms: These can be set to abort a test if the flow rate drops too low or increases abnormally. The low flow alarm is set as an absolute value below the normal working flow, while the high flow alarm is triggered by a significant increase in flow within a short period, adapting to the current flow setting.
  • Alarm Sounder: The audible alarm for flow failures can be muted.
  • Volume Display: The display can show volume in litres (to one decimal point for less than 1000 litres, then whole litres up to 100,000 litres, and then cubic meters to one decimal point) or always in cubic meters.
  • Auto Restart: Supervisors can configure whether a test resumes after a power interruption, including the number of allowed restarts (up to 50) and the maximum duration of a power failure (up to 100 hours).
  • Real Time & Date: These parameters can be adjusted if needed.
• Filter Medium Selection: The L60iF accommodates various filter types, including pre-weighed filters for gravimetric sampling and card-mounted or Maypack filters with appropriate adapters. Filters should be handled carefully to avoid particulate loss and maintain traceability.
• Calibration Mode: Accessed by holding the Right and Left arrows while powering on, this mode allows for calibration against a traceable flow meter. The motor warms up, and the user is guided through adjusting flow rates at specific points (e.g., 48, 53, 58, 63 l/min) using a restriction valve and reading the flowmeter.
• Temperature Compensation: The L60iF incorporates a four-point linearization algorithm to automatically compensate for changes in restriction due to different filter media and increasing particulate collection. It also accounts for changes in pump performance during warm-up, ensuring accurate readings from power-up.
• Diagnostic Mode: Accessed by holding the Up and Left buttons while powering on, this mode provides detailed information such as the first powered date, total time powered, pump run time, last calibration date, breakpoint values for linearization, and temperature calibration data (cold/hot measured flow, cold/hot true flow). It also allows for a calibration check to verify flow and temperature calculations.

Maintenance Features:

The L60iF is designed for ease of maintenance to ensure longevity and accurate operation:

• Surface Cleaning: The outer surfaces are simple and smooth, facilitating easy decontamination in accordance with local instructions.
• Filter Holder Cleaning: The filter holder should be cleaned after every sampling run to prevent build-up.
• Air Filter Replacement: The air filter at the rear of the instrument, which cools the pump and motor, should be changed regularly, with six months recommended initially. More frequent changes may be necessary if the sampler's interior shows signs of accumulating material. Disconnecting from mains power and allowing the fan to stop is crucial before removing the grille for filter replacement.
• Pump Maintenance: The pump blades or vanes are subject to wear and should be inspected annually, or more frequently with constant use. Munro Instruments offers training courses on L60iF maintenance and servicing, including pump disassembly, re-assembly, blade dimension checking, and performance measurements.
• Re-calibration: The sampler should be re-calibrated annually against a traceable standard flowmeter. Temperature calibration is recommended about twice a year or after pump servicing, as it compensates for changes in pump performance during warm-up.
• Fault Location:
  • A decrease in flow typically indicates the pump needs cleaning.
  • If the sampler stalls (e.g., due to dust in the pump), the overcurrent cutout will activate to protect the motor. The unit should be sent for maintenance immediately. The cutout button can be reset once, but repeated activation indicates a persistent issue requiring professional attention.
  • Abnormal display messages usually require a power cycle. If the fault persists, contact Munro Instruments for advice.
• Eprom Replacement: For firmware upgrades, the Eprom can be replaced by following a specific procedure involving disconnecting power, removing the case, identifying the Eprom on the circuit board, and carefully replacing it with the new version.

Munro L60iF Specifications

General

Accuracy	±1.5mm
Laser Class	Class 2
Laser Type	635nm, <1mW
Battery Type	2 x AAA
Protection Class	IP54
Display	LCD with backlight
Measuring Range	0.05m to 60m
Operating Temperature	0°C to 40°C
Battery Life	5000 measurements
Power Source	Batteries