COPA-DATA GmbH
COPA DATA is the innovation leader for HMI/SCADA software. This forerunner position rests on the ……...

The High Intensity Acoustic Sensors (Microphones) Models 765M30 and 765M35 are developed for the monitoring of gas-borne sound in industrial applications. These sensors are compatible with type 316 stainless steel diaphragms and are designed for usage in corrosive settings.
When paired with the all-welded structure, the electrically isolated, coaxial stainless steel hermetic connection creates a perfect hermetic seal.
Electrically, Models 765M30 and 765M35 use piezoceramic sensing elements in a balanced and floating design to enable improved rejection of electrical noise in a variety of industrial settings. The inherent acceleration sensitivity of the acoustic element is eliminated by an inbuilt accelerometer. When utilized with a real differential input amplifier, the best results are obtained.
For customized versions of this sensor, contact the manufacturer.
High temperature to +500 Deg F
Vibration compensated
Electrically isolated
High sensitivity (2100 pC/psi)
Specifications
Transfer/Electrical
Table 1. Source: Columbia Research Laboratories, Inc.
| Transfer / Electrical | 765M30 | 765M35 |
|---|---|---|
| Charge Sensitivity | 2100 +/-300 pC/psi | |
| Frequency Response | 2 Hz To 8,000 Hz | |
| Dynamic Range | 0.28 x 10-4 to 10 psi (191 dB SPL Max.) | |
| Vibration Sensitivity | 1.0 pC/g Typical, 2.0 pC/g Max. | |
| Avg Temp Coeff of Sensitivity | 0.08% / Deg F | |
| Transducer Capacitance | 14,500 pF +/-15% | |
| Insulation Resistance | 100 Megohms Min., 50 VDC Test | |
| Isolation Resistance | 100 Megohms Min., 50 VDC Test | |
| Dielectric Strength | 550 Vrms, 60 Hz, Element to Housing | |
Environmental
Table 2. Source: Columbia Research Laboratories, Inc.
| Environmental | 765M30 | 765M35 |
|---|---|---|
| Vibration Limit | 100 g Max. (Sine) | |
| Shock Limit | 1,000 g Max., 0.25 mSec | |
| Temperature Range | -10 To +500 Deg F (-23 To +260 Deg C) | |
| Humidity3 | 0 To 100% R.H. | |
| Static Pressure | 3,000 psi Max. (Diaphragm) | |
| Electromagnetic Sensitivity | 0.005 g (Equiv / 100 Gauss) | |
Physical
Table 3. Source: Columbia Research Laboratories, Inc.
| Physical | 765M30 | 765M35 |
|---|---|---|
| Configuration | Balanced Floating Compression | |
| Size | 1.375 In. Hex x 2.25 In. H (35.0 mm Hex x 57.2 mm H) | |
| Weight | 7.0 Oz (200 Gm) | |
| MaterialBody & Diaphragm | Type 316 Stainless Steel | |
| Electrical Interface | Isolated 10-32 Coaxial Connector | Isolated 10-32 Coaxial ConnectorSupplied with 1/2-14 NPSMStraight Pipe Thread for Armored Shielding |
| Mounting | 1.125 – 12 UNF-2A Straight Thread | |
NOTE: The unit is hermetically sealed when the connector is mated or protected.

Image Credit: Columbia Research Laboratories, Inc.
Accessories Supplied
Standard Calibration Data
Low Noise Cable Assembly (3M) (300 pF)
Hardwood Storage Case
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