Products by Perten Instruments, Inc.

This Application Note will demonstrate the extraction of
1,4-Dioxane from an aqueous matrix using Option 1 of
EPA Method 522 for 500 mL initial volume sample. It will
make use of the SmartPrep ...Read More

This Application Note will demonstrate the extraction of
1,4-Dioxane from an aqueous matrix using Option 1 of
EPA Method 522 for 500 mL initial volume sample. It will
make use of the SmartPrep Cartridge Extraction System to
produce a valid Initial Demonstration of Precision (IDP)
and Initial Demonstration of Accuracy (IDA). The
SmartPrep Extraction System can extract 6 samples
unattended when using the bottle rinse mode and 12
samples unattended when not in bottle rinse mode. In this
case, the SmartPrep will be made to run without the use of
the optional bottle rinse mode to maximize sample
throughput. All the flow rates were developed and
programmed into the SmartPrep to obtain the highest
recovery of the target

Mass flow devices, developed in the 1960’s, are critical components is systems that produce the specialty gas standards required to calibrate a wide variety of instruments that analyze gases.
Mass flow ...Read More

Mass flow devices, developed in the 1960’s, are critical components is systems that produce the specialty gas standards required to calibrate a wide variety of instruments that analyze gases.
Mass flow devices generate a signal that is proportional to the mass flow of a gas. Since the specific heat of a gas is unique to a particular gas, mass flow devices are unaffected by pressure and temperature changes. Thus, the signal they generate is very accurate and stable.
If the signal voltage from a mass flow device is used to indicate flow, it is classified as a mass flowmeter (MFM). If the signal from such a device is used in conjunction with a reference signal and a controlling valve, it is classified as a mass flow controller (MFC).
When several MFC’s are operated in parallel, and are electronically controlled within tight limits, the gas mixtures produced are extremely accurate. This is the principle behind a commonly used gas mixing technique called “Dynamic Blending.”

This article takes an in-depth look
at the advantages and disadvantages of steam and hot water for jacketed heating, and compares indirect and direct steam injection systems for making hot water.