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  User's Manual
Package Art
Features and Benefits
Competitive Advantages
What's Included?
Recommended
Specifications
What is It?
The Fieldpiece Optical Laser Tachometer, model SRPM2, is a non-contact tachometer that measures revolutions per minute on any spinning surface. It is designed to measure RPM or total count (total number of revolutions) on air conditioning and heating system blower motors and fans. An RPM reading out of spec can tell you that your wiring may need attention or that a motor is not running at maximum efficiency. It works up to four feet away and includes reflective tape required for testing. Replacement reflective tape is available from your favorite distributor (model RREF16).
How Does it Work?
SRPM2 is a portable standalone digital, laser tachometer. Point the laser at a fan blade or motor shaft and the RPM shows up immediately on the LCD.
Operation
SRPM2 works by reading reflected light from the laser. Each time the reflection is interrupted, a count is taken. Place a small piece of the supplied reflective strips on the target to make sure the laser is being reflected directly back to the instrument.
- Press and hold ON for 1 second to turn on SRPM2.
- Press Mode to toggle between RPM (revolutions per minute) and total count (total amount of revolutions).
- Press TEST once to turn on laser and start testing. Steadily aim meter so that laser hits the reflective strip.
- Press TEST again to turn off laser and stop testing.
- Press Mem after taking RPM readings to cycle through that set of reading’s Max, Min, and Last. A new set begins each time you press TEST.
- Quickly tap ON once to power down, or wait 25 seconds for auto-off.
Reflective strips
SRPM2 requires a reflection of its laser to work. Proper use of reflective strips is critical to get accurate readings. To sense the reflected light, the reflective strip must be big enough, you must aim the laser accurately enough, and you must be close enough. Typically a reflective square 0.5” on a side read at 4 feet or under works well. Make sure that light doesn’t reflect from either the surface of the target (other than the reflective strip) or from the background or foreground. For example, the fan blades of a fan running in front of a reflective background could cause multiple counts per revolution, multiplying the actual RPM.
If you find your measurement unstable or a multiple of what you think it should be, you may be “seeing” extra reflections of the laser. The reflector strip is designed to reflect the laser light back to the instrument, irrespective of the incident angle of the light. Therefore, to minimize extra reflections from the target or fan blades, don’t point the laser perpendicular to the reflective strip. This will help deflect unwanted reflections from fan blades or shaft away from the SRPM2 sensor (see diagram).
A screen in front of the target can cause problems by reflecting the laser light directly back to the laser, thus interfering with the laser light reflected from the reflector.
Additional reflective strips (3pcs, 6” x 0.6”) are available, model RREF16.
Only apply one small piece of a strip onto the surface your measuring. Do not place one on each blade of the fan. If you do, and there are three blades, you’re readings will be three times the correct reading. When working with a very reflective surface, try to find a place that isn’t reflective (e.g. the shaft) and place the strip there. You may need to wrap matte (not glossy) tape around the shaft and place the reflective strip on the tape to eliminate unwanted reflections.
Features and Benefits
Designed for HVAC/R, the non-contact Opitcal Laser Tachometer, model SRPM2, features improved accuracy, ruggedized boot, and fits comfortably in your hand. Measure fan and shaft RPM more quickly, easily and accurately - from up to 4’ away.
- Measures RPM without contact.
- Range: 1.5 to 99,999 RPM.
- Laser pointer.
- Works to four feet.
- Memory for Min., Max., and Last Reading.
- Ergonomic shape for better grip and aim.
- Highly visible, blue ruggedized boot.
Competitive Advantages
While there are other digital tachometers out there, few have the range and ruggedness you’ve come to expect from Fieldpiece. When combined with our reflective tape, the optical laser delivers accurate results from up to four feet away. The rugged rubber boot helps protect the instrument from abuse in the field, while the ergonomic shape is easy to hold and allows for easy one-handed operation.
What's Included
- Optical Laser Tachometer - SRPM2
- (1) 1.0’ x 0.5” strip of reflective tape (enough for approximately (20 + tests)
- Small Single Pocket Case - ANC2
- (3) 1.5V(AAA) batteries (installed)
- Operator’s manual
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Recommended Accessories and Replacement Parts
Technicians who like the SRPM2 may also enjoy these instruments and accessories:
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Expandable True RMS Stick Multimeter with Backlight - HS36
Our top of the line True RMS Stick Meter, the HS36 includes the ranges you use everyday for HVAC/R field service plus includes a bright blue backlight and True RMS. Like the rest of the HS30 series, the HS36 comes equipped with a magnetic hanger, along with detachable silicone test leads and alligator clip probe tips for remote and easy one-handed testing, as well as the full set of built-in safety features. This auto-ranging stick meter also includes a bar graph on the LCD for an analog feel. Technicians who prefer our expandable stick meters tell us this is the best digital multimeter for HVAC/R field Service.
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HVAC Guide® System Analyzer - HG2
The HVAC Guide® System Analyzer, model HG2, is the next generation hand-held diagnostic instrument that guides field technicians step-by-step through the most common and important HVAC system tests including: Target Evaporator Exit Temperature (delta T, evaporator drop, drop across the coil), Target Superheat, Superheat, Subcooling, Combustion Analysis and now the CheckMe!® test.
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Diagnostic Digital Sling Psychrometer – SRH2
The SRH2 Diagnostic Psychrometer performs all the normal functions of a digital psychrometer plus it calculates critical A/C system targets from psychometric measurements. It measures temperature (DB) and %relative humidity (%RH) and calculates wet bulb (WB) and dew point (DP). The SRH2 goes a step further than traditional digital psychrometers in that it also calculates target superheat and target evaporator exit temperature (delta T, drop across the coil, evaporator drop, temperature split) with built-in charts and the psychometric measurements. It’s the only digital psychrometer that takes measurements using an electronic sensor (NTC) or k-type thermocouples (T/C).
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Superheat and Subcooling for A/C and Refrigeration - SSX34
The Fieldpiece Superheat and Subcooling for Air Conditioning and Refrigeration meter, model SSX34, measures suction line, or low side, line temperature and pressure. It then calculates actual superheat in real time using built-in P/T charts. It also measures liquid line, or high side, temperature and pressure, and calculates actual subcooling. Use it to get actual superheat on R-22, R-410A, R-134A, and R-404A fixed orifice systems and actual subcooling on TXV / TEV regulated systems. Use the “T” fitting to charge to actual superheat or subcooling by putting the SSX34 in-line between your refrigerant bottle and the system.
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Specifications
TECHNICAL SPECIFICATIONS
Autorange: 1.5 rpm to 99999 rpm, 0 to 99999 counts
Resolution: (at 75ºF ambient) 0.1rpm, 1count
Accuracy: ±(0.03%+3digit)
Laser power: less than or equal to 2mW
Battery: 1.5V(AAA) x 3 (installed)
Battery life: 35 hours (operating), 1 year (off)
Auto-off: 25 seconds without use.
Operating temp: -0.4ºF to 104ºF
Base time: 12MHz
Display: 13mm 5digits LCD
Suggested distance from target: less than 40 inches when using 0.5” x 0.5” strip
Accessories: 2 reflective strips, batteries (installed), ANC2 carrying case, operator’s manual.
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