AI-TEK T77530-70 TACHPAK 30 Series Dual-Channel Digital Process Tachometer

The AI-TEK T77530-70 is a premium member of the renowned TACHPAK® 30 Series of dual-channel digital process tachometers, specifically engineered for explosion-proof speed monitoring applications . Manufactured by AI-TEK Instruments (formerly AIRPAX), this sophisticated computing tachometer measures input frequency from rotating machinery and converts it into actionable outputs for critical protection and control systems .

Designed for the most demanding hazardous environments, the T77530-70 features a heavy-duty explosion-proof enclosure certified for use in Class I, Groups B, C & D; Class II, Groups E, F & G; and Class I, Zone 1, Group IIC hazardous locations . With a substantial net weight of 24.0 pounds, this instrument is built to withstand the harshest industrial conditions while delivering uncompromising performance .

Key Technical Specifications

The AI-TEK T77530-70 offers exceptional technical capabilities that make it the preferred choice for critical rotating machinery protection:

Input Power: Universal wide-range supply accepting 80-264 VAC (50/60 Hz) and 12-30 VDC, providing flexibility for global installations 

Dual-Channel Input: Accepts two independent speed sensor inputs for redundant measurements or monitoring separate rotating elements 

Signal Compatibility: Receives sine wave or square wave TTL signals from any frequency source, including magnetic sensors and bi-directional Hall effect sensors for direction sensing 

Operating Modes: Can be used in rate, period, or counter mode for versatile applications 

Outstanding Performance Features

Blazing Fast Response Times

The T77530-70 delivers real-time performance essential for overspeed protection:

Analog Output: 7.6 ms response time 

Mechanical Relays: 16.5 ms response time 

Solid-State Relays: Ultra-fast 2 ms response time 

Exceptional Accuracy

Analog Output Accuracy: 0.1% over temperature and load 

Relay Accuracy: 0.005% internal instrument accuracy 

16-bit D/A Conversion: 610 nanoamps per step resolution for precise analog output 

Comprehensive Output Capabilities

Analog Output: User-programmable 0-20 mA, 4-20 mA, or -20 to 0 to +20 mA (bi-directional capability) 

Mechanical Relays: (2) Form C relays rated at 6 A @ 277 Vac for high-power switching 

Solid-State Relays: (2) Form A relays rated at 0.4 A @ 60 Vac or DC for fast response applications 

RS485 Communication: Utility RS485 for remote programming and data transmission up to 8000 feet