Hamamatsu TV Hollow Cathode Lamps

Chemical Engineering

Accession Number: 2018.che.130.1-3

Description:

A collection of three Hamamatsu TV hollow cathode lamps. Each lamp consists of a sealed glass tube. The tubes are narrow at the top, wider at the bottom. At the base of each tube there is a silver and black vacuum tube plug with two silver electrical pins protruding from one end.

Each tube comes in a black plastic case that is lined with a brown-green foam insert.

2018.che.130.1: A “Ni” (Nickle) tube filled with neon gas. The tube has a labelled max current of 20 MA and an operating current of 10 MA.

2018.che.130.2: A “Cr” (Chromium) tube filled with neon gas. The tube has a labelled max current of 20 MA and an operating current of 10 MA.

2018.che.130.3: A “Al” (Aluminum) tube filled with neon gas. The tube has a labelled max current of 20 MA and an operating current of 10 MA.

This collection includes a cardboard sheet showing the analytical lines of each of the available Hamamatsu Hollow Cathode Lamps, as well as operating information for each lamp. This is stored with the object documentation.

Alternative Name: HTV Electron Tube

Primary Materials: Glass, Metal.

Markings:

2018.che.130.1: Type number printed on tube label in black lettering: “L233-28NQ”. Date printed on tube label in blue pen: “11-17-82”.

2018.che.130.2: Type number printed on tube label in black lettering: “L233-24NB”. Date printed on tube label in blue pen: “82-8”.

2018.che.130.3: Type number printed on tube label in black lettering: “L233-13NB”. Date printed on tube label in blue pen: “2-24-82”. A label on the top of the plastic case reads “Current 10ma in blue pen”.

Dimensions (cm):

Plastic cases are: Height = 8.5, Width = 8, Length = 20; Tubes: Length 15, Max Diameter = 4.

Function:

A Hollow Cathode Lamp (HCL) is a standard light source that produces a spectrum of light representing one or more chemical elements.

HCLs are used in atomic analysis instruments such as the atomic absorption spectrometer. The sealed glass tube contains an inert gas such as argon or neon. An element of interest is housed in the hollow cathode within the glass envelope. Current applied across the anode and cathode ionizes the gas within the tube creating a plasma. This ionized gas is accelerated towards the cathode, which sputters atoms off the sample element at the cathode. These freed atoms are excited by collisions within the plasma. When these atoms decay to a lower energy state, they produce a characteristic spectrum of light that can be compared to that of a sample for the purpose of chemical analysis.

Condition:

Excellent: Labels are very slightly discoloured and abraded. The metallic base of 2018.che.130.3 is slightly oxidized.

Manufacturer: Hamamatsu TV Co. Ltd

Date of Manufacture: C. early 1980s.

Provenance:

This artifact was acquired by the UTSIC collection from the University of Toronto Department of Chemical Engineering and Applied Chemistry on June 15, 2018.

  • Donated to UTSIC