No u vetles de I't'n dus trie

009 sizes, widens the nominal cooling capacity range, from 20.8 to 30.5 kW. This gives more design flexibility, making the 50CD/CH units ideal for applications in small commercial buildings: such as food stores, schools, small businesses, shopping centres and office buildings.

The 50CD units provide efficient and economic performance using a downflow air delivery design. An indoor air fan discharges supply air directly down into ductwork. Since static pressure loss is reduced, more of the fan static pressure is available, thus increasing unit efficiency.

The 50CH units, with horizontal airflow, can be placed on slabs, piers or unit supports, or on roofs, when roof curbs or downflow cannot be used. The units can also be connected to existing horizontal ductwork or plenum.

Carrier Distribution Limited, Carrier House, The Crescent, Leatherhead, Surrey, UK.

Heating pump range extended

In response to market demand, Grundfos Pumps is extending its current 21-strong U M T / U P T heating circulator range with a further nine pump models.

Twin and,~agle head versions of the Grundfos UMT/UPT direct-coupled in-line circulators

The U M T / U P T range of direct- coupled in-line heating circulators combines the design features of Grundfos' commercial glandless heating pumps with those of its CR vertical multi-stage in-line pumps

Six models in the U M T ' U P T 40 range have single or twin head configurations for a single or three phase power supply. Other twin head versions also introduced are the UMTD 100/30 and 100//60, and the UPTD 100/120. All the twin head pumps have a built-in non-return valve in the discharge port to prevent reverse circulation in the idle stand- by unit. UMT(D)/UPT(D) 40 models are supplied complete with 1.5in BSP counter flanges, whilst U M T D / U P T D 100 models have 4in BSP counter flanges.

Among the features of the UMT, UPT range are in-line ports for easy pipeline mounting, and the use of stainless steel components for pump shaft and impellers for greater resistance to corrosion.

With its wtde temperature range ( - 1 5 to + 12ffC), flow rates from 2 to 26dm 3s-1 and suitability for frictional resistances up to 120kNm ,, the range is ideal for LTHW and MTHW heating systems up to 6 bar pressure, or air con- ditioning plants.

Grundfos Pumps Ltd, Grovebury Road, Leighton Buzzard, Bedford- shire, UK.

Portable data logger for precision temperature measurement

A hand-held data acquisition and processing terminal, Thermodig #P2000, has been introduced for precision temperature monitoring and measurement by Automatic Systems Laboratories (ASL) Measurements Division.

Using touch-buttons, this micro- processor-based portable logger can be either manually operated or programmed for automatic data

collection at selected intervals. Data can be stored in the memory and output to a printer. The standard built-in memory allows storage of 23 values and is optionally expandable by RAM to 500 values: pro- grammable tune intervals are 10 and 30s, 1.5, 15 and 30min and 1 and 2 h.

Two versions of the terminal are available, one for type K thermo- couple probes measuring from - 200 to +1370~C, and one for Ptl00 platmum resistance probes measuring between - 250 and +850'C. Each version has two measurement ranges with automatic switch-over for optimum resolution on the LCD four-digit display: up to + 200'C giving a resolution of 0.1'C: and above 4 200C with 1 ( ' resolution. The accuracy is _+ 0.1 ",, m all cases with a maximum linearization error of between 0.05 and 0.2"C, depending upon the version and range. Automatic offset correction assists long term stability.

Touch-buttons initiate on/off, print (and disptay), clear (screen,' memory), C 'F (display/print), and select for surface or immersion {probe). Function touch-buttons select four temperature measure- ments present value, trend, minimum and maximum during the cycle. A "memory' button instigates data storage and 'recall' button restores erased data to memory. A 'time' button initiates automatic operation and selects the pro- gramming interval, while another marked timer displays the time elapsed since the last automatic storage and printout. Arrowheads on the display keep track of the various operating modes.

A small Epson P40 dot matrix printer (optionalt and temperature sensing probe are supplied and carried with the terminal in a briefcase. Independently powered by rechargeable batteries, these two units comprise a completely self- contained, relatively low-cost system for solving numerous temperature measurement and analysis problems throughout general industry and in research laboratories.

62 Int. J. Refrig. 1987 Vol 10 January