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ETP 14533 Multiplier (AF533)

ETP 14533 Multiplier (AF533)
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Product ID : 14533
14533 ETP AF533 Electron Multiplier

Features

For instruments: Shimadzu QP5000

Description

For instruments: Shimadzu QP5000

14533 is specifically designed for application in Shimadzu QP5000 mass spectrometers. The 14533 is a direct "plug-in" replacement electron multiplier for the QP5000 mass spectrometer and is fully compatible with the Shimadzu hardware and software.
There are three electrical connections to be made to properly install the AF533. Electrical connections are made via the three pins extending from the base of the multiplier.
The positions of the three connection pins, 1) high voltage, 2) shield and 3) signal output, are shown in the diagram opposite. (Ground is connected via the mounting bracket).

Specs

Replacement multiplier for instrument Shimadzu QP5000 (GCMS)
Maximum Dark Current (pA) / Counts (cts/min) at 2.5kV 1/3
Number of dynodes (excluding HED) 12
Internal resistance (MΩ) 16.6MW
Typical Gain at 2.0kV (when new) 1 x 107
Typical Voltage for 1 x 105 Gain (when new) 1.25kV
Maximum Temperature Under Vacuum 350 °C

Technical

Care and Handling

ETP Electron Multipliers are incorporated as original equipment in all areas of mass spectrometry and surface science, as well as a diverse range of analytical and general physics applications. They offer the performance required by modern instrumentation and have a proven reputation for reliability and ruggedness.

The original packing supplied by ETP is suitable for long term storage. The multiplier is enclosed in two sealed plastic bags. The outer bag contains a silica gel package to minimize adsorption of moisture, which could otherwise lead to excessive outgassing upon installation. Contained in its original packaging, the shelf-life of an ETP Electron Multiplier is guaranteed for up to two years from the date of shipment. If it is necessary to store the multiplier outside its original packaging, it should be kept in a clean, dust-free, low-humidity environment, such as a glass desiccator.

In order to minimize contamination, standard high-vacuum techniques are recommended when handling ETP Electron Multipliers. Clean, powder-free nitrile or latex gloves or finger cots should be worn to prevent the transfer of skin oils to critical or mounting surfaces of the multiplier. All tools, mountings, and equipment should be thoroughly cleaned (see instrument manual) prior to coming in contact with the multiplier.

(WARNING) Care should be taken to minimize exposure of the multiplier to dust or other airborne contamination. Dust particles within the detector may result in increased background noise during operation.

(WARNING) Exposure of the multiplier to high humidity should be avoided in order to minimize outgassing during initial operation. Excessive noise due to adsorbed moisture may be rectified by leaving the multiplier under high vacuum for 24 hours

Active Film

ACTIVE FILM Multipliers™ are a new development in multiplier technology that incorporate totally air-stable "ACTIVE FILM" materials into a discrete-dynode multiplier design to produce an exceptionally sensitive ion detector with long operating life and excellent air stability. ACTIVE FILM Multipliers™ give a combination of performance and durability unsurpassed by any other type of electron multiplier detector.

ACTIVE FILM Multipliers™ have higher gain than alternative multipliers resulting in consistently lower multiplier voltages. Their long operating lifetime means less frequent multiplier replacement and reduced instrument down-time.

ACTIVE FILM TECHNOLOGY

ACTIVE FILM Multipliers™ are a new type of electron multiplier detector for mass spectrometry and represent the latest development in electron multiplier technology.

ACTIVE FILM Multipliers™ combine the wide dynamic range and longevity of discrete-dynode multipliers, with the compact size and air stability of continuous-dynode multipliers.

ACTIVE FILM Multipliers™ are completely air-stable while exhibiting extremely wide dynamic range, long operational life, and very high sensitivity.

Installation

Installing and Operating

ETP Electron Multipliers generally require no preconditioning if stored correctly. The multiplier should be installed according to the instrument manufacturer’s instructions. There should be no sharp objects in close proximity to the entrance aperture as this could result in noise during operation. Operating pressure should be as low as possible for best lifetime and minimum noise. To avoid risk of damage due to discharge or arcing, the multiplier should not be operated at a pressure in excess of 1 x 10-4 Torr.

(WARNING) Applying the maximum rated supply voltage to a new multiplier can cause damage and permanent loss of gain.

(WARNING) Do not increase the applied voltage to a multiplier to overcome background noise as this can cause permanent loss of gain.

Obtaining Optimum Lifetime from an ETP Electron Multiplier

Operational life varies depending on application and can be affected by the following factors:

  • Operating Environment: Lower operating pressure and lower partial pressure of hydrocarbons in the vacuum chamber will result in increased operational life, all other conditions remaining the same.
  • Operating Gain: Operation should always be at the lowest applied voltage consistent with good signal acquisition. In general, the lower the gain, the longer the life of the multiplier. The gain of a electron multiplier will fall gradually over time, requiring the applied voltage to be periodically increased. This is a normal part of the multiplier aging process.
  • Output Current: Multiplier lifetime is inversely proportional to average output current. Excessive input signals should be avoided, especially when operating at high gain.

Rapid degradation of multiplier performance may result from failure of the vacuum pumping system. This may cause severe contamination of the detector or damage due to arcing caused by the sudden increase in chamber pressure. Degradation caused by vacuum failure may be permanent and irreversible, especially if the multiplier supply voltage was ON during the vacuum failure.

NOTE: Due to the wide variety of applications and environmental conditions within instruments, there is no warranty on the operational lifetime of any electron multiplier.

ETP does not recommend washing or cleaning of multipliers.

Warranty

Contact Us for extra ETP information.

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