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Micro-QT Valves – The future of air sampling and analysis.


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Tool Free, Leak Free - Micro-QT™

The Micro-QT is a next generation gas valve offering uncompromising leak-tight performance in an ergonomic design. The Micro-QT is also versatile, providing numerous connection options to cover a wide range of applications. Once the valve is connected to tubing using compression fittings, mating male and female valve ends is literally just a quick “snap”.

Originally designed for environmental air sampling and analysis, the Micro-QT has found a place in numerous other applications. Micro-QT’s feature a distinctive bright and colorful Silonite coating that prevents gas phase compounds from interacting with the metal surface. The rugged, solid design stands up to thousands of connections, while maintaining leak tight operation. For scientists and professionals working with VOC and SVOCs, the Micro-QT’s compact internal volume reduces exposure to potentially contaminated surfaces and allows for easy cleaning.

Designed specifically for tool-free air sampling and hassle-free analysis.

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The Most Durable and Accurate Sample Collection Valves for EPA Methods TO-14A and TO-15.
Applications
There are several ways to fill a MicroValve™ canister or Bottle-Vac™ depending on sampling requirements. Here’s a brief overview:
Grab Sampling
MiniCan™ or Bottle-Vac™ samplers are filled within 0.1–0.3 minutes using an unrestricted sampler with a Micro-QT™ valve.
Restricted Critical Orifice Sampling
Sample collected using a filtered orifice restricted sampler. Fill rates are constant until the canister reaches ½ atmosphere.
Time Integrated Sampling
Time-integrated sampling is used for slow filling of canisters to determine average target compound concentrations. Fill times are 10–50 times longer than with critical orifice restricted samplers. Use CS1200E and the PN: 30-22800 adapter for Micro-QT™ Valve Samplers.
Instructions for Field Sampling
Micro-QT Valve Brochure

The Micro-QT™ Valve is optimized for volatile and light semi-volatile compounds. The Micro-QT™ Valve is compatible with all existing Entech sampling devices by simply adding a female Micro-QT™ to ¼” adapter (PN 30-22800).

Micro-QT™ Valve Kit
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SiloniteTM MicroValves


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The Micro-QTTM is a next generation pneumatic valve offering uncompromised leak-tight performance in an ergonomic design. The Micro -QTTM is also versatile, providing numerous connection options to cover a wide range of applications. Once connecting the valve to tubing using compression fittings, mating male and female valve ends is literally just a quick “Snap!”

Originally designed for environmental air sampling and analysis, the Micro-QTTM has found a place in numerous other applications. Micro-QT’s feature a distinctive bright and colorful SiloniteTM coating that prevents gas phase compounds from interacting with the metal surface. The rugged, solid design stands up to thousands of connections, while maintaining leak tight operation. For air, gas, and headspace sampling professionals, the Micro QT’sTM compact internal volume reduces exposure to potentially contaminated surfaces and allows for easy cleaning.

Entech 2018 Catalog


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This is the complete Entech 2018 Catalog. You can download the PDF or use our Flipbook viewer (below) for a smoother experience. Please note that not all sampling products are included. The Entech store is the best place to find photos and descriptions of every product we carry.

 

Creating Accurate Low Level TO15 Standards with the Entech 4700 Precision Diluter


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Background

The analysis of Air Toxics TO-15 compounds in air by GCMS requires the accurate preparation of low level standards to fulfill 3 distinct requirements:

1 Create GCMS response factors for each target compound across the full range of expected concentrations

2 Validate the canister preconcentration system for consistent preconcentration and matrix management without loss of target compounds during analysis by GCMS

3 Provide inexpensive preparation of low level standard to allow recovery testing of all sampling canisters in a laboratory’s inventory for inertness validation

The ability to meet item #1 could simply be achieved by performing a loop injection of high concentration standards, but this would not meet the requirements of #2 and #3, which require the standards to be diluted down to ambient levels, often times below 1 PPBv. As described in more detail later, it is best to use at least 2 standards when creating a GCMS calibration curve, as this typically allows method calibrations over a wider concentration range, often times up to 1000x or more.

Large concentration ranges can reduce the number of dilutions and reruns that are necessary by a laboratory, thereby increasing productivity. For example, generating a calibration curve from 0.04PPBv to 40 PPBv would allow all samples within this range to be quantified without further dilution, whereas reducing the range to just 0.04PPBv to 4 PPBv would require any samples with target compounds in the range of 4 to 40 PPB to be rerun using smaller sample volumes, or after diluting a representative aliquot into a second canister.

Items #2 and #3 in the previous list are extremely important when performing accurate TO15 analyses, yet are often not given the consideration they deserve.

Creating standards that are as similar to the concentration and matrix of real samples is critical to prove that target compounds will be recovered properly during the preconcentration and matrix elimination process. Although calibration standards are stable in Silonite coated canisters without the presence of water, it is recommended that canisters be made up with between 50-70% relative humidity just so the sample preparation system can be challenged just as it will be with real samples. A discussion follows that describes how moisture levels in this range can be used to challenge the analytical system with extremely large or small amounts of total water just by varying the preconcentration volume.

Toxic Organics Valve-2


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TOV-2TM Valve

The repairable valve specifically designed for Toxic Organics sampling

The TOV-2TM Toxic Organics Valve has been specifically designed to ensure complete recovery of low-level TO-14a and TO-15 target compounds. A pack less system features an ultra-compact, passivated sample path with no internal weld scars, and a SiloniteTM coating option for superior inertness and durability. The TOV-2 has Entech’s exclusive NF technology that uses replaceable nickel ferrules that exhibit less carryover relative to replaceable vespel or V/G ferrules. The TOV-2’s new “sure-seal” valve seat creates a leak-tight seal even more easily than before. A low-cost kit is available so you can easily maintain valves at the peak of scientific reliability and performance. The TOV-2 Valve is the only repairable valve on the market! Ask your Entech Analytical Solutions Manager or Distributor about how this advancement can deliver maximum recovery with minimal carryover for assured compliance with new lower level VOC methods.

TOV-2TM Features

EPA Methods TO-14A & TO-15 Ready!
The Toxic Organics ValveTM and Entech’s SiloniteTM canisters are the most reliable way to collect samples for EPA methods TO-14A and TO-15
Packless System
The ultimate reliability in a metal sealing valve
SiloniteTM Flow Path
A SiloniteTM treated ow path is available for superior inertness, corrosion resistance, and trustworthy sampling
It's Repairable!
Ever throw away an entire valve because it can no longer seal properly? A low-cost repair kit is now available for the TOV-2TM
SiloniteTM Coated Flow Paths
SiloniteTM provides unparalleled inertness, durability, and corrosion resistance you can trust!
Ultra-Compact Design
No other valve in its class can come close to matching the analytical transparency of the TOV-2TM
SiloniteTM Surface Coating
We believe that each and every canister should be as inert and corrosion resistant as possible. That is why all of our canisters feature SiloniteTM
Welded Valve Gaurd
Unlike “strap” designs, our TOVTM guard provides superior valve protection and far less added weight.
Extended Range Canister Sampling
Our SiloniteTM Canisters are more inert than SUMMA® or electropolished canisters, allowing recovery of a greater range of chemicals – including reduced sulfur compounds.

TOV-2TM Valve Applications

Now, maximize the flexibility of your canister inventory! Add the benefits of our exclusive McDaniels Controls gauge directly on the TOV-2TM Valve - the only fully repairable valve on the market!

Silonite Canisters with NEW Toxic Organic Valve

0.01–100 PPB Trace Level

Entech’s SiloniteTM canisters feature a large volume capacity for detection of volatile chemicals down to the low part per trillion range. An inert and durable internal SiloniteTM coating provides a high-quality, long-term sample storage solution. Losses in the valve are avoided by using our new Toxic Organics ValveTM (TOV-2TM) which includes Entech’s new “sure-seal” technology and low carryover, replaceable nickel ferrules. The TOV-2 valve is also fully repairable! An integrated valve guard is securely welded to the canister for superior light-weight valve protection without any stresses to the valve stem associated with heavy “strapped-type” valve guards. These canisters are certified to meet or exceed the technical specifications required for EPA methods TO-14a and TO-15. High-quality performance is verified for EVERY canister with our demanding chemical inertness tests.

Field Canister Testing

We are the only manufacturer to offer the unsurpassed range, quality, and reliability of McDaniel Controls, Inc. gauges with ¼” compression fitting. The compression fitting connects easily to a dual stem canister, or our new dual port TOV-2TM without any need for Teflon® tape for improved canister cleanliness.

You can also choose to verify sample integrity in the field with the precision and reliability of the DDSTM Gauge. The digital gauge shown below features absolute pressure readings that are never affected by altitude!

We also offer high quality McDaniel® Gauge assemblies for easy field testing of standard TOV-2TM equipped canisters that do not have the included gauge option or a dual stem with an attached gauge.

Field Canister Testing

Low Pressure Reduced Sulfur (0.1–100 PPB)

Sulfur gases can be collected and analyzed using SiloniteTM coated samplers and canisters. Sulfur compounds have been shown to be stable in SiloniteTM canisters for 1–2 weeks, allowing sufficient time to perform laboratory analysis, even if samples must be shipped over long distances after sampling. Odor threshold levels can be met using GCMS or GC/CLD (Chemiluminescence Detector) when pre-concentrating 10–200cc of sample.

Maximum stability of H2S and Methyl Mercaptan requires relative humidity to be below 20%. When the relative humidity is above 20%, excess water can be absorbed using Bottle-Vac samplers that contain a small amount of anhydrous Silica gel. Just enough Silica gel is used to absorb most of the water without affecting H2S or Methyl Mercaptan concentrations, allowing these compounds to be stable for weeks. When monitoring a wider range of sulfur compounds, it is recommended to use two different samplers; the 29-BV500-H2S or 29-BVL1-H2S for H2S and Methyl Mercaptan, and a standard Bottle-VacTM or SiloniteTM coated MiniCanTM or larger SiloniteTM canister for all other compounds. SiloniteTM coated cylinders are also available for high-pressure refinery gas sampling environments and long-term storage requirements.

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