® TACHTROL 20 Single Input Digital Tachometer Part Number Series T77250 RoHS ® TACHTROL 20: The newest member of the AI-TEK Tachometer family. ® The TACHTROL 20 is a single input digital instrument designed to provide the versatility and flexibility needed to accommodate virtually any rate measuring application. Configurable to display application-specific rate information in raw frequency or engineering units such as RPM or FPM. ® The TACHTROL 20 can accommodate magnetic pickups, logic sensors, and NPN open collector sensors. The pulses are received and scaled so the desired display can be achieved. The meter is programmed through both the front panel buttons and DIP switches. Once the programming is complete, the front panel buttons can be disabled by a DIP switch setting. The meter has been specifically designed for harsh industrial environments. With NEMA 4X/IP65 sealed bezel and extensive testing to meet CE requirements, the meter provides a tough, yet reliable application solution. FEATURES AND ADVANTAGES: • Single-channel precision speed or rate monitoring • Field adjustable scaling • Bright six-digit LED display • Wide frequency range 0.1 to 25 kHz • Active or passive sensor input • Panel Mount 1/8 DIN standard housing • Fast response • Low cost • Easy set-up • High precision • Operating temperature range 0° to 60° C • AC power: 115 / 230 volts selectable • DC power: 10-16 volts at 0.1A max It is the customer’s responsibility to determine whether the product is proper for customer’s use and application. 22 AI-Tek Instruments, Cheshire, CT USA 23 AI-Tek Instruments, Cheshire, CT USA ® TACHTROL 20 Panel Mount Adapter Installation Instructions ® 1. Apply the panel gasket (supplied with Tachometer) over the TACHTROL 20 meter. ® 2. Insert the TACHTROL 20 meter through the mounting plate. ® 3. Apply the panel gasket (supplied with the adapter kit) over the TACHTROL 20 meter behind the mounting plate. ® 4. Insert the TACHTROL 20 meter with mounting plate and gaskets into the front of the existing ® Tachtrol 2 meter hole cut-out. Slide the adapter plate over the rear of the TACHTROL 20 meter. ® 5. Slide the panel latch (supplied with the Tachometer) over the rear of the TACHTROL 20 meter and tighten the screws. ® TACHTROL 20 PANEL MOUNT ADAPTER — P/N: 675-0303-001 24 AI-Tek Instruments, Cheshire, CT USA Target / Speed Variables Conversion RPM SS x PPR UPM UPH f= x PPR = = x PPU = x PPU 60 π x D 60 3600 RPM f x π x D SS = x π x D = 60 PPR 60 x f 60 x SS RPM = = PPR π x D D = (PPR + 2) = SS x PPR DP f x π (PPR + 2) 25.4 DP = = DM π π x PD CP = = DP PPR PPR CP x PPR PD = = DP π 25.4 25.4 x D M= = DP (PPR+2) 60 x f f x π x D PPR = (D x DP) - 2 = = RPM SS Definitions: f = frequency in Hz or cycles per second (cps) SS = surface speed in inches per second (ips) RPM = rotary speed in revolutions per minute PPR = pulses per revolution or number of gear teeth D = outside diameter of target (gear) in inches PD = pitch diameter of target (gear) in inches π = 3.14 UPM = unit measure per minute UPH = unit measure per hour PPU = pulses per unit measure DP = diametral pitch = number of teeth in 1 inch pitch diameter CP = circular pitch = arc distance between teeth on pitch circle M = metric module = pitch diameter in mm divided by number of gear teeth 25 AI-Tek Instruments, Cheshire, CT USA