Kahn Easydew Portable Hygrometer, 75-7417, -148°F to +68°F dewpoint range

Description

Kahn Easydew Portable Hygrometer, Part No. 75-7417, -148°F to +68°F dewpoint range
Seller's Description:
Offered is a Kahn Easydew portable hygrometer, (S/N 133699) in excellent working and cosmetic condition.
The Easydew uses a Kahn ceramic sensing element for determining humidity from incoming gases, with a range from -148 to 68 degrees F dewpoint.  The sensor is virtually chemically inert and has fast response, high calibration stability, and high resistance to corrosive environments.
Fittings on the top of the unit are marked "1" and "2", and switch positions depending on whether the gas being monitored is pressurized or ambient pressure.  One of the fittings contains a filter unit, and both have 1/4" swagelok-style connectors.  The unit is powered by rechargeable batteries, but can also accept standard "C" cell alkalines; charge is indicated by a gauge on the panel.  The unit is contained in a rugged, water resistant NEMA 4 Pelican case.  An output socket and connector allows you to build a 4-20 mA output lead for feeding into secondary monitoring or control systems.
The unit comes with an AC power unit for battery recharging, 6 ft of PTFE 1/4" OD sample tubing, an extra filter unit, and the 4-20 mA plug for wiring to your external device.  I have a PDF of the operating manual, also provided.  I do not have a calibration certificate for this unit.  It's recommended you have the unit calibrated by Kahn or a suitable Metrology provider with NIST traceable humidity gases.
This unit appears in excellent condition.  I picked it up about three years ago at auction and it looks barely used.  It's sat in my shop cabinet since.
Results from Function Test:
I tested the unit recently (see pictures).  First, I charged the unit and it took charge from the AC power supply, eventually showing charge in the green on the battery indicator.  Turning on the unit, it initially gave a dewpoint reading of about 37
°F
(I live in SoCal).  I then attached a compressed air source and ran compressed air through the unit at about 5 psi supply pressure.  The dewpoint immediately began to drop.  Readings stabilized near 30
°F +/- 2
°F over 5 - 10 minutes.
Who are you buying from?
I am a professional scientist/engineer with 28 years of laboratory experience.  I know equipment: how to use it, integrate it, or re-purpose it; test, troubleshoot and fix it (if need be); and mostly how to source and select good used pieces for my personal use or for resale here.  I provide accurate descriptions of what it is and what it can do for you.  If you have a question on this item or in comparison to another, please feel free to ask.  Thank you!
What's Included:
Easydew portable hygrometer with AC charger, 6 ft PTFE tubing, extra filter, and 4-20 wireable connector, as described.
PDF copy of Manual
Conditions for Sale:
By making an offer or purchasing this item you agree to the following terms:
·
It is the buyer’s responsibility to fully comply all regulations made by the U.S. Food and Drug Administration and state and local regulatory agencies upon purchasing this item.
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The buyer will not hold the seller responsible for the appropriate or inappropriate use of this device either by the user or a third party.
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Once purchased, it is the sole responsibility of the buyer to assume any and all liability from the use of this device.
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It is assumed that the buyer understands the nature of the item(s) at the time of purchase.
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Test results of item(s) for sale is/are described to the best of seller's ability in the ad; unless otherwise stated, the equipment is shipped operational. At this point, it is the buyers responsibility to inspect and test the item(s).  Shipping terms are Freight On Board, buyer should insure the shipment to prevent against loss.
·
Used equipment carries no warranty by the seller; buyer assumes all responsibility of the equipment once shipped, and any inoperability that may occur during shipping shall be resolved between the buyer and the freight company. Seller may be available to provide advice on repair in a good faith effort to resolve any issues.
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Equipment identified as "NEW" will carry a 14-day warranty against failure (less shipping), provided it is determined that the equipment was used as intended and the buyer returns equipment to me for failure analysis (buyer pays return shipping).  "NEW" replacement parts/components carry no warranty and may not be returned/refunded.
Manufacturer's Description and Specifications
Technical Specification sheet provided on request