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Compact, low cost digital indicators
• ®ws the industry-previews-research • the industry-previews-research the industry Compact, low cost digital indicators A range of digital temperature indicators and programmable indicator/ regulators, manufactured in Italy by SAE srl, is now being introduced to the UK market exclusively by Teddington Controls Limited of St. Austell, Cornwall, UK. The M1, PM1 and PM21/4 digital indicators are available. Suitable for use throughout industry, these compact low-cost models offer a wider choice of operating parameters than Teddington's own ETR electronic thermometer, which is being discontinued. With suitable signal inputs, some of the indicators can be used to display %r.h. and pressure (bar). Sophisticated SAE electronic controls, that now supersede Teddington's ETT combined electronic thermometer/thermostat, are also available. These controllers are the first in a wide range of increasingly versatile SAE instruments to be offered by Teddington and more information on these products is available d i r e c t l y from the Company.
M1, PM1 and PM21/4 indicators operate across various measuring ranges between - 9 9 . 9 ° and + 1200°C or -146 ° and + 2 2 0 4 ° F , depending upon the type of signal input. M1 and PM1 indicators with four-digit LED digital displays are available in three design formats: Series 31 - 64 having a 31 x 64 mm front panel and a 72 mm deep rectangular electronics enclosure: Series 4 8 - 96 having a 48x96mmpanelanda 114mm deep rectangular enclosure; Series 72-72 having a 7 2 × 7 2 m m panel and a 6 0 m m diameter x 90 mm deep enclosure. The three types are rated for IP50, IP52 and IP65 (with O-ring seal) front of panel protection, respectively. Each series comprises seven models variously accepting inputs from PTC semiconductor probes, RTD thermoresistance (PT 100) probes and K-type thermocouples, or 1 0 m Y continuous voltage ( ± 1 V d.c.) and 4 - 20 mA current signals. The PM21/4 is additionally available in the Series 4 8 - 96 and accepts two inputs, for PTIO0 probes, with sequential visualization through a multiplexor system.
Figure 1 Compact,low cost SAEdigitalindicators marketed by Teddington
SMES systems could be used by industries, hospitals, office complexes and shopping centres to reduce electricity costs during peak-demand periods. SMES systems could store electricity during periods of low demand and release it during periods of high demand, thereby minimizing peakdemand electricity costs. Small SMES systems might also be used as power backup to protect sensitive equipment, such as large computer or telecommunication
systems, against sudden power outages. High temperature superconductors are ceramic materials discovered in 1986 that lose all resistance to electrical current flow when cooled by inexpensive, easyto-handle liquid nitrogen. The joint research project will assess the use of high temperature superconductors in SMES devices up to approximately room-size. Such devices would use superconducting magnets to store 20 to
Series 3 1 - 6 4 models operate from a 12 V a.c./d.c., 50/60 Hz power supply. The other two use a 220/240 V a.c., 50/60 Hz supply as standard with 24 and 100 V a.c. options available. Accuracy of these indicators is + 0 . 2 5 % of span, ± 1 digit, and thermal shift is < 0.1% of span per 1 0 ° C v a r i a t i o n of a m b i e n t temperature. Measurement errors owing to voltage fluctuations in the power supply are insignificant up to ± 10 V of the nominal value. For further information about the SAE range, please contact Teddington Controls Limited, Holmbush, St Austell, Cornwall PL25 3HS.
research Superconducting magnetic energy storage Combustion Engineering, Inc., of Windsor, CN and the Superconductivity Pilot Center at the US Department of Energy's Argonne National Laboratory, near Chicago, have agreed to a joint research project to assess the technical and commercial feasibility of small superconducting magnetic energy storage (SMES) s y s t e m s using high temperature superconductors. If shown to be feasible, small
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M1, PM1 and PM21/4 indicators operate across various measuring ranges between - 9 9 . 9 ° and + 1200°C or -146 ° and + 2 2 0 4 ° F , depending upon the type of signal input. M1 and PM1 indicators with four-digit LED digital displays are available in three design formats: Series 31 - 64 having a 31 x 64 mm front panel and a 72 mm deep rectangular electronics enclosure: Series 4 8 - 96 having a 48x96mmpanelanda 114mm deep rectangular enclosure; Series 72-72 having a 7 2 × 7 2 m m panel and a 6 0 m m diameter x 90 mm deep enclosure. The three types are rated for IP50, IP52 and IP65 (with O-ring seal) front of panel protection, respectively. Each series comprises seven models variously accepting inputs from PTC semiconductor probes, RTD thermoresistance (PT 100) probes and K-type thermocouples, or 1 0 m Y continuous voltage ( ± 1 V d.c.) and 4 - 20 mA current signals. The PM21/4 is additionally available in the Series 4 8 - 96 and accepts two inputs, for PTIO0 probes, with sequential visualization through a multiplexor system.
Figure 1 Compact,low cost SAEdigitalindicators marketed by Teddington
SMES systems could be used by industries, hospitals, office complexes and shopping centres to reduce electricity costs during peak-demand periods. SMES systems could store electricity during periods of low demand and release it during periods of high demand, thereby minimizing peakdemand electricity costs. Small SMES systems might also be used as power backup to protect sensitive equipment, such as large computer or telecommunication
systems, against sudden power outages. High temperature superconductors are ceramic materials discovered in 1986 that lose all resistance to electrical current flow when cooled by inexpensive, easyto-handle liquid nitrogen. The joint research project will assess the use of high temperature superconductors in SMES devices up to approximately room-size. Such devices would use superconducting magnets to store 20 to
Series 3 1 - 6 4 models operate from a 12 V a.c./d.c., 50/60 Hz power supply. The other two use a 220/240 V a.c., 50/60 Hz supply as standard with 24 and 100 V a.c. options available. Accuracy of these indicators is + 0 . 2 5 % of span, ± 1 digit, and thermal shift is < 0.1% of span per 1 0 ° C v a r i a t i o n of a m b i e n t temperature. Measurement errors owing to voltage fluctuations in the power supply are insignificant up to ± 10 V of the nominal value. For further information about the SAE range, please contact Teddington Controls Limited, Holmbush, St Austell, Cornwall PL25 3HS.
research Superconducting magnetic energy storage Combustion Engineering, Inc., of Windsor, CN and the Superconductivity Pilot Center at the US Department of Energy's Argonne National Laboratory, near Chicago, have agreed to a joint research project to assess the technical and commercial feasibility of small superconducting magnetic energy storage (SMES) s y s t e m s using high temperature superconductors. If shown to be feasible, small
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