Castle Type 1 Risk Assessment System Rental

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Measuring noise really does not have to be complicated, even for the novice, and the Castle 6224 (Class 1) Integrating sound level meter is designed with this in mind. There are 5 user selectable percentile values (LN and Equivalent continuous level (Leq). They also have a wide linearity range of 90dB.

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1: Choose a Start Date

2: Choose Rental Duration

  • 1 Week
    £165.00 Selected
  • 2 Weeks
    £297.00 Selected
  • 3 Weeks
    £421.00 Selected
  • 4 Weeks
    £421.00 Selected
  • Short Term
    £99.00 Selected

For longer durations please contact us

3: Optional Extras

Add Damage Waiver +10% of total fee
Add Return Carriage Via Courier - £20


Total Price

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Castle Type 1 Risk Assessment System Rental

How do I book?

Booking is easy, choose your Rental Period, Start Date and any available accessories. After you click 'Add to Cart' and complete the checkout process we'll check your product is available and contact you to confirm your order.

The Damage Waiver is calculated at 10% of the cost of rental.

Return Carriage means we will arrange collection and return to us for £20.

Note that the Price shown here will reflect the instrument and Rental Period. Return Carriage and Damage Waiver costs will be added on the Cart and Checkout Pages.

Brand Castle Group
Application Environmental Noise, Noise at Work
Features Data Logging
Class Class 1
Weightings A, C
Measurement Parameters Leq, (Percentiles) Ln's
Available Outside the UK? Yes

Castle Type 1 Noise Risk Assessment Rental Kit

Measuring noise really does not have to be complicated, even for the novice, and the Castle 6224 (Class 1) Integrating sound level meter is designed with this in mind. The meter is ideally equipped for carrying out Noise at Work Risk Assessments, as well as the majority of environmental survey work. The range of parameters measured, the wide measuring capability of the meter and the ease of use, mean that this equipment is suitable for anything from aircraft noise to lawnmower design, and from construction sites to laboratories.

Noise at Work Measurements The Castle 6224 provides the essential measurements required by the Control of Noise at Work Regulations 2006, including Leq (equivalent continuous level) in ‘A’ and ‘C’ weightings, and Cpeak. The meter can data-log any of these parameters in up to 10,000 data-memories, making it more than powerful enough for the task in hand.

Environmental Monitoring Also ideally suited to environmental monitoring, the Castle 6224 can measure 5 selectable percentile values and sound exposure (LE). Most environmental measurements require Leq and L90 plus possibly one or two other measurements. These can all be measured simultaneously with the Castle 6224 and data-logged into its 10,000 data-point memory.

Multi-purpose Measurement Many sound measuring tasks require the measurement of Leq (equivalent continuous level), Lmax (Maximum rms level), LE (Sound Exposure) or percentiles, and all of these can be completed using the Castle 6224 with its accessories.

Operation The Castle 6224 (Class 1) Integrating Sound Level Meter has an easy to follow menu system and clearly marked keys, all designed to make the meter simple-to-use. The back-lit LCD display is also very clear with large figures and a quasi-analogue display bar to show the changes in sound level as they happen.


  • Equivalent continuous level (Leq)
  • 5 user selectable percentile values (Ln)
  • Wide Linearity range of 90dB
  • RS232 for data output to optional software
  • Memory storage for 10,000 datapoints
  • Back-lit LCD display

Technical Specification

Standards GA6224 : Conforms with IEC 61672-1:2002 Class 1, IEC 60651:1979 and IEC 60804:2000 Type 1 Microphone GA6224 : 7146N 1/2" electret condenser microphone
Measuring Ranges 27 - 130dB(A), 38 - 130dB(C), 41 - 130dB(F)
Frequency Ranges 20Hz - 20kHz
Time Weighting FAST, SLOW, IMPULSE
Peak Range 50 - 133dB(A), 60 - 133dB(C), 70 - 133dB(F)
Level Range 20 - 80dB, 20 - 90dB, 20 - 100dB, 20 - 110dB, 30 - 120dB, 40 - 130dB
Linearity Range 90dB
Frequency Weighting A, C, FLAT
Measurement Items Lp, LMH, Leq, LAe, Lmax, Lmin, Lx (L5, L10, L50, L90, L95), Peak
Measurement Time 1s, 3s, 5s, 10s, 1min, 5min, 10min, 15min, 30min, 1h, 8h, 24h manual (max: 199h 59m 59s)
Sampling Interval 20.8µs (Leq), 10ms (Lmax, Lmin)
Lx Sampling Interval 100ms
Display LCD with backlight (128×64 dots)
Digital Display Four line, resolution 0.1dB (display update 1s)
Bar Display Display update: 0.1s
Warning Over range: +3dB from upper limited scale
Under Range -0.6dB from lower limited scale
Battery Display Four level display of battery condition
Built-In Memory Approximately 10, 000 samples: 1, 000 sets of results
Built-In Calendar Year/month/day/ hour : minute : second
Pause Pause and a function that deletes preceding 3 or 5 sec. data
Calibration Signal Internal generator (1 kHz sine wave)
AC Output 1Vrms (FS), output impedance: 600O, load impedance > 10kO
DC Output 2.5V (FS), 0.25V/10dB, output impedance: 50O, load impedance > 10kO
RS232 Interface RS-232C (asynchronous); data bits : 8 bits; stop bit : 1 bit; parity : none; baud rate : 4800, 9600, 19200 bps
Power Supply Four 1.5V size-AA batteries or AC adapter
Battery Life Alkaline batteries: 20 hours continuous operation. Use of LCD backlight will shorten battery life (approximately 1/3)
Operating Temperature -10 to +50°C
Humidity 30% to 90% (without condensation)
Size 85(W) × 287(H) × 46(D) mm
Weight 370g (including batteries)

What's in the Box

The Type One Risk Assessment System kit includes:

  • GA6224 Class 1 Logging Sound Level Meter
  • Carry Case
  • Software

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