PosiTector DPM L Series

How often should the $\text{PosiTector}$ $\text{DPM}$ $\text{L}$ $\text{Series}$ probe be recalibrated?

The probes come with a Certificate of Calibration showing traceability to a national metrology institute ($\text{NIST}$ or $\text{PTB}$) and have no expiration date. While DeFelsko suggests a starting interval of one year from the date the instrument is placed in service, organizations should establish calibration intervals based on their specific quality program, experience, and operating environment.

Does the PosiTector $\text{DPM}$ $\text{L}$ $\text{series}$ arrive pre-calibrated from the factory?

Yes. Both the $\text{DPM}$ $\text{L}$ and $\text{DPM}$ $\text{L+}$ models are fully calibrated and ready to measure upon arrival. The included Long-Form Certificate of Calibration provides documented actual readings taken in the laboratory, proving traceability to national standards.

Does the PosiTector $\text{DPM}$ $\text{L}$ $\text{series}$ provide a wet-bulb temperature measurement?

Yes. Both the $\text{DPM}$ $\text{L}$ and $\text{DPM}$ $\text{L+}$ models automatically measure and indicate the wet-bulb temperature in addition to the other five environmental parameters.

How long does it take for the meter logger to acclimate to a new environment?

Acclimation time varies. When moving between similar environments, the instrument stabilizes quickly (within seconds). However, when moving between environmental extremes (e.g., cold air-conditioned interior to hot, humid exterior), stabilization can take up to 30 minutes to ensure accurate readings.

Is the $\text{PosiTector}$ $\text{DPM}$ $\text{L}$ $\text{Series}$ suitable for monitoring conditions inside a high-temperature oven?

No. The $\text{DPM}$ $\text{L}$ $\text{Series}$ is not recommended for prolonged use in an oven, as internal components are susceptible to damage at temperatures greater than ≈50∘ $\text{C}$ (122∘ $\text{F}$). For oven temperature profiling, the $\text{PosiTest}$ $\text{OTL}$ $\text{Oven}$ $\text{Temperature}$ $\text{Logger}$ is the recommended alternative.