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MURPHY MT90 Speed / Time Sensors & Instruments
MT90 Selectronic Digital Tachometer MT90数字转速表
数字式速度表
MURPHY Selectronic MT90数字转速表采用基于石英晶体时间的数字固态电子器件，具有高精度和高可靠性。MT90转速表也有背光，以便于在低亮度区域进行读数；这种照明需要电池电源。Murphy Selectronic MT90数字转速表通过使用石英晶体时基和数字固态电子设备提供高精度和可靠性。转速表电源由安装在发动机飞轮齿圈上的墨菲磁传感器或12、24或32伏直流电池系统提供。转速数据由墨菲磁传感器或蓄电池充电电路中的交流发电机提供。MT90转速表也有背光，以便在低亮度区域读取。这种照明需要一个电池电源。通过在转速表背面设置一系列校准旋转开关，将MT90校准到发动机转速。发动机的正确开关顺序取决于（1）磁传感器的齿圈齿数或（2）发电机与发动机皮带轮直径之比和发电机极数。典型应用包括：发电机、压缩机、工业发动机、油田设备、船舶、车辆，农场设备和建筑设备。
The Selectronic MT90 digital tachometer offers high accuracy and dependability resulting from use of a quartz crystal time based and digital, solid-state electronics. The MT90 tachometer also has back-lighting for easy readings in low lit areas; this lighting requires a battery power source.The Murphy Selectronic MT90 digital tachometer offers high accuracy and dependability resulting from use of a quartz crystal time-base and digital, solid-state electronics.Tachometer power is supplied by either a Murphy magnetic pickup mounted at the flywheel ring-gear of an engine or by a 12-, 24- or 32-volt DC battery system.
RPM data is supplied by either a Murphy magnetic pickup or by the alternator in your battery charging circuit. The MT90 tachometer also has backlighting for
easy readings in low-lit areas. This lighting requires a battery power source.
The MT90 is calibrated to engine RPM by setting a series of calibration rotary switches on the back of the tachometer. The proper switch sequence for the engine is determined by (1) the number of ring gear teeth for the magnetic pickup or (2) by the ratio of alternator to engine pulley diameter and the number of poles of the alternator.Typical applications include: generators, compressors, industrial engines, oil field equipment, marine vessels,vehicles, farm equipment and construction equipment.
MURPHY MT90 Model Selectronic Digital Tachometer PDF Catalog
特点
- ±1 RPM 精度
- 易于校准
- 清晰读取的 LCD 显示屏
- 用于夜间查看的背光（电池供电型号）
- 输入源可以是磁性拾音器或发动机交流发电机
- 由磁性拾音器或 12、24 或 32 VDC 电池系统供电
Features:
- ±1 RPM Accuracy
- Easy Calibration
- Clear-Read LCD Display
- Back Light for Night Viewing (Battery Powered models)
- Input Source Can Be a Magnetic Pickup or Engine Alternator
- Power Supplied by Magnetic Pickup or 12, 24, or 32 VDC Battery System
- Signal Input Voltage : 4 to 35 Vrms from a magnetic pickup or alternator*
- Pulses per Revolution : 3 to 999
Power Requirements
- Pickup Power : 4-35Vrms*
- Battery Power : 8-40 VDC (12, 24, 32 volt)
Current :
- Tach backlight Off, 4mA @ 40 VDC
- Tach backlight On, 25 mA @ 40 VDC
- Case : 1018 polycarbonate/polyester blend
- Lens : Polycarbonate Bezel: #430 Stainless Steel
- Display : LCD, 4-digit, seven segment
- Operating Temperature : -4° to 158°F (-20° to 70°C)
- Storage Temperature : -13° to 185°F (-25° to 85°C)
- Mounting Hole : 3-7/16 in. (87 mm)
- Shipping Weight : 14 oz. (0.4 kg)
- Shipping Dimensions : 5-1/2 x 5-1/2 x 5-1/2 in. (140 x 140 x 140 mm)
MT90-1: Digital Tachometer; white background face plate (20700019)
MT90-1-B (20700020)
MT90-1-B （20700020）数字转速表（黑色不锈钢表圈）
For more information about this product, you can download the related literature here:
Pickup Models Total Length Threaded Length Thread Size
MP3298* 3 in. (76 mm) 3 in. (76 mm) 5/8-18 UNF
MP7906. 3 in. (76 mm) 3 in. (76 mm) 3/4-16 UNF
MP7905.. 4-1/2 in. (114 mm) 4-1/2 in. (114 mm) 3/4-16 UNF
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