Metrology Laboratory

The “Conductivity - Temperature Transfer Standard CT 01” (for brevity’s sake, hereafter referred to as “CT 01”) is a compact instrument, designed for metrology laboratories, to perform calibration of oceanographic CTD probes. It combines a Primary Standard 100 ohm RPRT (Reference Platinum Resistance Thermometer), a large-sized IDRONAUT self-flushing cell provided with seven internal rings of fused platinum in the quartz with a microprocessor-controlled high-resolution and high- accuracy electronic amplifier. Optionally, the CT 01 can become a redundant measuring system when equipped with two temperature and two conductivity sensors. The high-performance electronics collects and transmits the temperature and conductivity readings through the RS232C interface from 1 to 10 times per second. The CT 01 functions are managed by means of a simple communication protocol through the RS232C interface. A Windows interfacing and calibration management programme “ICAL”, which greatly simplifies the CTD probe calibrations, completes the CT 01.Two CT-01 Systems are equipped with redundant Temperature and Conductivity Sensors.

 

The Model ATB-1250 is a compact instrument designed to speed and simplify temperature/resistance measurements in standards and metrology laboratories. It allows the user to enter thermometer constants, either manually or automatically, and then read temperature (°C or K) and resistance directly from the display. The unique AC bridge and microprocessor permit control of various measurements or accuracy verification modes by an operator or an external computer. Operator control is implemented via a front panel keypad in conjunction with an alphanumeric display. Computer control and data transmission is via an RS-232-C or optional IEEE-488 interface. Conversion of resistance to temperature is accomplished by the standard IPTS-68 equation. The microprocessor performs the calculation of resistance to temperature while the bridge is digitizing. The Model ATB-1250 is widely used with the companion CSA-1250 conductivity/salinity adaptor, which provides highly accurate data for calibrating conductivity.

The Hart Scientific Model 7012 is a very precise constant temperature bath. An innovative state of the art solid-state temperature controller has been incor¬porated which maintains the bath temperature with extreme stability. The con¬troller uses a microcontroller to execute the manifold operating functions. User interface is provided by the 8-digit LED display as well as by the four key-switches. Digital remote communication is optionally available with an RS-232C or IEEE-488 interface. The tank for the 7012 is in titanium and holds 36 litres. Two Hart Scientific 7012 units are present in the laboratory.

The Guildline 8410A Portasal® is a truly portable, high precision instrument from the world leader in salinometers. This all new instrument will deliver Salinity calculations on board ship with laboratory level confidence. The 8410A combines the latest in microprocessor technology with the time-tested measurement principles and reliability of the Guildline Autosal Laboratory Salinometer. It is housed in a compact, protected package that is easy to use while providing faster calculations and improved data logging capability. This portable salinometer measures accurate conductivity ratios and displays calculated salinity directly as well as measured parameters.

The Hart Scientific Model 5943 Stainless Steel Gallium Cell holds a gallium sample that is 99.99999+% pure. The gallium is sealed in a Teflon envelope in a high purity argon atmosphere, which is itself sealed inside a stainless steel housing. This double-sealing method reduces leaching into the gallium sample and ensures a life of ten years or longer for the cell.

Nominal temperature values		29.7446°C
Expanded Uncertainty (K=2)		+/- 1.0 mK (0.5 Typical)
Metal sample purity		99.99999%
Immersion depth		76.2 mm
Casing material		Stainless Steel
Well I.D.		6.35 mm
Cell size		127 x 24 mm

The Model 9230 is a specialized instrument for the realization of the gallium melting point (29.7646°C). The instrument works with Hart’s Model 5943 stainless steel Ga cell to provide melting plateaus that can last a week (or longer). This instrument is intended for Calibration Laboratory use and not for field applications. Internal programming of the micro-processor controller provides preprogrammed scan rates, set-points for each step in the process, dwell timing, and indication that the next step is ready.

The Hart Scientific triple point of water cell consists of a cylindrical borosilicate glass container with a re-entrant tube which serves as a thermometer well. The design features a wide mouth at the opening for easier cell preparation. The bottom of the cell is fixed with a rubber bumper to cushion the cell in your dewar or bath holding fixture. The cells are thoroughly cleaned, filled with high purity gas-free water with the isotopic composition of sea water, and then sealed. The equilibrium temperature is realized at the ice-water interface surrounding the thermometer