Microphone Disc GM90 for BATmode Systems
Electret Ultrasonic Microphone Disc with Test Signal Speaker for mounting in the nacelle floor of wind turbines or on a tripod.
The GM90 microphone disc was developed in cooperation with the BMU-funded research projects RENEBAT I-III (WindBat). The disc features an ultrasonic microphone capsule Knowles FG -23629-P16, which fulfills all the requirements in terms of sensitivity, frequency response and directionality for a successful bat monitoring in wind turbines. A built-in preamplifier enables low noise levels of the microphone signals and thus allows cable lengths of 50 m and more between the bat monitoring system BATmode 2S or BATmode 2S+ and the microphone disc. To avoid weather-related condensation on the microphone capsule, an electric heater is installed in the disc which allows a constant microphone sensitivity and guarantees high data quality. This sensitivity can be monitored and logged with the help of the integrated test signal speaker. Consequently, bat activity data collected with this microphone disc is fully compatible with the BMU guidelines and the sofware tool ProBat, which can calculate wind turbine operating algorithms from the acoustic data of the nacelle monitoring.
To protect against weather and environmental conditions, all electronic components are encapsulated in a splash-proof aluminum disc. For installation in the floor of the nacelle a 100mm mounting hole is required (see Drilling plan - GM90 in Product attachments).
Main features
- Knowles FG - Microphone capsule
- 40kHz test signal speaker
- Integrated microphone heating
- Wind protection ring
- ∅ 90mm (outer diameter) / ∅ 140mm (mounting plate)
- Installation in the floor of the nacelle of wind turbines via 100mm drill-hole
- Compatible with ProBat and the BMU research project WindBat (RENEBAT)
Specifications
- Knowles FG - Microphone capsule
- 40kHz test signal speaker
- Microphone heating
- Wind protection ring
- Approximate input-referred self-noise level (bandwidth: 30-50 kHz): 26 dB SPL
- Approximate sensitivity: 500mV / Pa
- Microphone power supply: 5V / 25mA provided by UltraSoundGate xx16Hnbm
- Heating power supply: 19V / 12,5mA provided by BATmode (on request also 5V / 50mA provided by an USB power adapter)
- Combined microphone and test signal speaker connector: male XLR-5 plug
- Heating connector: male XLR-3 plug
- ∅ 100mm (wind protection ring) / ∅ 140mm (mounting plate)
- Installation in the floor of the nacelle of wind turbines via 100mm drill-hole
- Compatible with ProBat and the BMU research project WindBat (RENEBAT)
- Length cable set: 2m
Delivery & Returns
Shipping is calculated at checkout based on order weight, product type and delivery postcode. Prices exclude VAT.
Delivery times
| UK mainland | 1 to 3 working days for orders placed before 2pm |
| Scotland, Northern Ireland & UK offshore areas | 2 to 5 working days for orders placed before 2pm |
| Europe | 3 to 5 working days for orders placed before 2pm |
| Rest of world | 7 to 14 working days for orders placed before 2pm |
Delivery costs
UK mainland: delivery starts from £7.92.
Highlands and Islands: delivery starts from £25.
Northern Ireland: delivery starts from £20, rising to £90 for orders up to 60kg.
Larger orders, pallet deliveries and some offshore or international deliveries may require a quote.
For European orders, please visit wildcare.eu, call +33 (0)4 65 65 00 05 or email [email protected].
Need it by a certain date?
Please tell us when ordering. For urgent orders, call 01451 833181.
Returns
If your order arrives damaged or incorrect, please contact us within 5 working days.
A Returns Number may be required before sending goods back. Call 01451 833181 or email [email protected].
Please see our full returns policy for more information.
