Products - Gas actuated thermometers DE WIT gas actuated thermometers are manufactured to the highest standards for a wide range of uses and may be fitted in almost any temperature indicating application. They are made of stainless steel so they are resistent to corrosion, chemical attack and tough industrial use. The temperature responsive system is gas actuated and does not contain mercury or any other toxic aggressive liquids. The thermometers can be supplied as a rigid stem model or with capillary, for remote reading applications. Typical applications include (petro)chemical industry, food and beverage industry, offshore, engines, paper and other process industries. Operating principle The temperature responsive system consists of a probe, capillary and a flattened spiral bourdon tube. This sealed system is filled with an inert gas (nitrogen is standard). When the bulb is heated, the pressure in the system increases and the spiral tube unwinds slightly to operate the micro-adjustable pointer. The scale is linear. A bimetallic device connected to the bourdon tube will compensate for errors due to ambient temperature variations. Standard specifications Dial sizes 63 mm, 100 mm, 160 mm Case material stainless steel AISI 304, weatherproof Ring material stainless steel AISI 304, bayonet lock, polished Window laminated safety glass Dial anodised aluminium, white with black markings Pointer aluminium, black finish, adjustable execution Pointer deflection 270 degrees Accuracy cI. 1 to DIN 16203 for dial sizes 100 and 160 mm, cI. 1,6 to DIN 16203 for dial size 63 mm Movement stainless steel AISI 304 Connection stainless steel AISI 316, seven standard connection types are available, see probes Stem stainless steel AISI 316 Capillary 3 mm diameter stainless steel AISI 316 or stainless steel with flexible armour (armour material is stainless steel AISI 302) Ranges from -200 C up to 650 C (see table) (minimum span 0 - 60 C). Options Dial size 50 mm, 250 mm Liquid filling (add V to model number) a) to avoid condensation on the window when mounted outside b) where the thermometer is exposed to vibrations Case and bayonet ring material stainless steel AISI 316 Contacts: electric, inductive and magnetically assisted contacts can be fitted to 100 mm and 160 mm dial thermometers Other probe dimensions Other instrument connections External zero adjustment O.E.M. executions If you are an Original Equipment Manufacturer and plan to incorporate our thermometers in your finished product for resale, special ranges or special dials can be made to suit your particular requirements. Such specials can bear your own company name and/or logo on the dial. The quality, appearance and performance of a DE WIT thermometer will complement your equipment. Thermowells, recommended when used with liquids and for pressures over 6 bar. Standard temp. ranges Centigrade -200/+50 -120/+40 -100/+50 -80/+40 -60/+40 -40/+40 -30/+30 -30/+50 0/+60 Fahrenheit -300/+100 -200/+100 -150/+150 -100/+100 -80/+120 -40/+120 -30/+90 -30/+130 +20/+140 Centigrade 0/+100 0/+120 0/+160 0/+200 0/+250 0/+300 0/+400 0/+500 0/+600 Fahrenheit +20/+220 +20/+270 +20/+320 +20/+420 +20/+520 +30/+530 +30/+730 +30/+930 +30/+1130

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