轉速計，又名轉速表、轉速儀，是機械行業的儀器之一，用來測定電機的轉速、線速度或頻率

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轉速計，又名轉速表、轉速儀，是機械行業的儀器之一，用來測定電機的轉速、線速度或頻率。常用于電機、電扇、造紙、塑料、化纖、紡織、汽車、飛機、輪船等制造業。大多常用的為手持離心式轉速計。

轉速計，又名轉速表、轉速儀，是機械行業的儀器之一，用來測定電機的轉速、線速度或頻率。常用于電機、電扇、造紙、塑料、化纖、紡織、汽車、飛機、輪船等制造業。大多常用的為手持離心式轉速計。美國Checkline旗下的轉速計一般為數字式，有接觸式和非接觸式兩種測量。非接觸式采用光電器件測量，無連接軸，對被測件無任何影響，提高測量精度。

例如Checkline DT-5TXR型是一款帶輸出模塊的面板式轉速表，擁有三種測量模式：轉速，線速和速率。

The Check-line DT-5TXR panel meter with optional output Modules is an economical unit for speed and process time monitoring when combined with a compatible in-line sensor. Loaded with features found in more expensive units, the DT-5TXR Panel Meter is extremely versatile with selectable inputs. The DT-5TXR is fully scalable and possesses three selectable modes allowing it to measure RPM/linear speed/rate, elapsed time and process time. Each panel meter accepts a variety of signal inputs from any sensor providing an NPN, contact, sine wave, or square wave such as pulse generators, proximity sensors, photoelectric sensors, magnetic sensors and NPN OC transistors. Typical applications can range from machining operation timing, rate of change monitoring such as on a conveyor, elapsed time of oven curing etc. with any variety of compatible sensor inputs desired. The DT-5TXR panel meter also accepts various output modules, enabling it to output data for analysis, record keeping or assist in controlling the process through a separate control device. Up to two modules can be accepted simultaneously, offering an enormous number of combinations and options.

Large 6 digit LED display plus two smaller 6 digit secondary displays allow easy viewing from greater distances
Highly accurate (± 0.008% ± 1 digit) makes ideal for process control and analysis
Selectable update time allows operator to speed up/slow down display changes to facilitate process
Selectable decimal point enables higher resolution display potential 1/8 DIN size panel cut out permits easy, industry-standard mounting
Great versatility with multiple sensor input capability in one unit: NPN open collector, contact and square or sine wave sensor inputs
Accepts up to two output modules allowing voltage, current, BCD, NPN & relay output combinations for control or remote process monitoring
IP66 front cover protection keeps water out, enables usage in compatible plant wash-down operations
Wide power range (85 – 264VAC, 50/60Hz) eliminates need for having to purchase and wire an additional power transformer.
Scalable programming gives user the flexibility to set up and monitor virtually any process
24V DC-Powered model available, DT-5TXR-DC
DC power source output to power compatible sensors saves money by eliminating need for separate power supply
Front cover protection eliminates accidental bumping of keypad to incorrect program
Up to two (2) Optional Output Modules can be used simultaneously

Measuring Range	10 - 99,999 rpm (at 1 p/r) 0.2 - 30,000 rpm (at 60 p/r)
Display Range	Tachometer/Rate Meter: 0 - 999999 with selectable decimal point Elapsed Time: 0:00:00 - 9:59:59 or 0.00 - 999.99 sec. Process Time: 0:00:00 - 0:59:59 or 0.00 - 999.99 sec.
Scalable	Yes (with outputs, see modules)
Accuracy	Tachometer/Rate Meter & Elapsed Time: ± 0.008 % ± 1 digit Process Time: ± 0.008 % ± 1 digit
Display Update Time	0.2, 0.5, 1, 2, 5, 10, 15, 30, 60 sec.
Input No. of P/R	1 to 9,999 (programmable)
Input Signal Characteristics	NPN open collector input: max. frequency 100 kHz / Contact input: max. frequency 20 Hz / Square wave input: max. frequency 30 kHz - Sine wave input (magnetic pickup): max. frequency 10 kHz
Sensor Power Supply	12 VDC (150 mA)
Power Requirement	85 - 264 VAC (50/60 Hz) Optional (9 - 35 VDC at 1 W also available)
Ambient Temperature	32° - 113° F (0 - 45° C)
Dimensions	5.27" x 3.78" x 1.89" (134 x 96 x 48 mm)
Product Weight	0.66 lb (300 g)
Package Weight	0.95 lb (430 g)
Warranty	2 Years
Included Accessories	Mounting adapters & screws, decal sheet