Does PosiTector SPG TS have lower spring pressure than SPG CS?
The spring pressure is slightly greater than the SPG TS to allow the tip to rest fully in the contour. Keep in mind that there is no standard for this approach, so we design stress based on internal testing.
Is PosiTector SPG TS traceable to PTB or NIST?
All PosiTector SPG probes including SPG TS are traceable to PTB.
Does your instrument require formal training to use it? Do you offer 'demo' models?
No. Our instruments are designed simply, with easy-to-use menus, full and quick instruction manuals, and helpful videos. In lieu of a demo model, we offer unlimited technical support by phone and/or email with a limited 30-day money-back guarantee.
Is the PosiTector SPG factory calibrated?
The PosiTector SHD arrives fully calibrated and ready to measure. Includes a long-form calibration certificate traceable to NIST or PTB that documents the actual readings taken by the instrument in our calibration laboratory against standards traceable to national metrology institutes. Beware of "certificates" or "certificates of conformity" offered by competitors. These usually do not include actual instrument readings and are often insufficient to meet common quality requirements.
The accuracy and correct operation of the gage can be verified using the included metal spacers and glass zero plate.
Can I measure curved surfaces with PosiTector SPG?
For accurate measurements, the probe feet of the PosiTector SPG need to contact the surface over the entire area. On tightly curved surfaces, the edge of the probe will not rest on the surface, skewing the reading.
Our PosiTector SPG instruments comply with Method B as described in ASTM D 4417 "Standard Test Method for In-Situ Measurement of Surface Profiles of Blast Furnace Clean Steel". The entirety of ASTM D 4417 pertains specifically to flat blasted steel surfaces. Therefore, any depth micrometer instrument used to measure the surface profile of curved blasted steel surfaces does not comply with ASTM D 4417.
Replica tape is excellent for recording blast profiles on curved surfaces, and the manufacturer recommends the PosiTector RTR Replica Tape Reader instrument as a reliable measurement alternative.
Can PosiTector SPG be used on non-metallic substrates?
Yes! The PosiTector SPG is primarily used for measuring grit blasted steel, but can be used in a variety of applications. PosiTector SPG TS and PosiTector SPG CS also feature extended reach and larger radius probe tips for a variety of applications:
- The PosiTector SPG CS measures the surface profile of textured coatings quickly and accurately.
- The PosiTector SPG TS measures the surface profile of concrete quickly and accurately.
Why does PosiTector SPG have 30˚ and 60˚ tips?
PosiTector SPG features durable tungsten carbide tips for long life and continuous precision. The SPG probe tip can be replaced with a gage operator if desired.
- 60° tip meets most testing standards including ASTM D 4417 B.-
A 30° tip is available to comply with Australian Standard AS 3994.5-C.
Can the PosiTector SPG move over a surface to provide "scanning"?
No. The PosiTector SPG is a depth micrometer instrument that quickly and accurately measures and records the peak-to-valley surface profile height of blasted steel surfaces.
Like other instruments of this type, the PosiTector SPG does not drag across the blasted surface: the instrument operator takes a separate reading at one location on the surface, lifts the gauge and places it at another location on the surface for another Read alone, so on.
Does the PosiTector SPG measure pit depth?
A pit gauge is a general type of instrument used to measure pits and other surface variations. The PosiTector SPG is specially designed to measure and record the peak-to-valley surface profile height of blasted steel surfaces.
Should I buy PosiTector RTR or PosiTector SPG for my application?
Both instruments conform to ASTM D 4417 "Standard Test Method for In-Situ Measurement of Surface Profile of Blast Furnace Clean Steel."
PosiTector SPG complies with ASTM D 4417 Method B. PosiTector SPG measurements are fast and cost-free. It keeps a digital record of each measurement and is less operator involved as there is no need to replicate the polishing of the tape. It also has a greater range than replica tape.
PosiTector RTR complies with ASTM D 4417, Method C. It is used with Testex Replica tape, a widely used and respected method for measuring surface profiles. It is capable of taking measurements on curved surfaces and offers the user the option to keep a replica tape; a physical replica of the test surface.
How often should PosiTector probes be recalibrated?
PosiTector probes include a calibration certificate with no expiration or end date. They have no shelf life, so the length of time in the field is not a good indicator of recalibration intervals. Many organizations with quality programs and recertification programs require annual recalibration, which is a good starting point for most users. The manufacturer recommends that customers establish calibration intervals based on their own experience and work environment. Based on our product knowledge, data and customer feedback, a one-year calibration interval from the date the instrument is placed into service is a good starting point.
