A20T Series TEMPERATURE SWICHGAGES A20T Series SWICHGAGES^Ò  have the same heavy duty mechanical movement  as  the  steel  case  Series  20-T  which  have  proven  their reliability  in  millions  of  installations  around  the  world.    New  A20T housing  was  developed  to  provide  'above  ground'  circuits  for  marine and other installations where 'grounded' circuits are not practical. Designed for use on applications where a two or three wire circuit for alarm,   shutdown   or   process   control   is   required,   ALONG   WITH ACCURATE  VISUAL  MONITORING  OF  TEMPERATURES.    These instruments are ideal for:   Engine Coolant   Crankcase Oil   Transmission Oil   Air/Oil in Compressors   Refrigeration Systems   Outboard Bearings   ANY  PLACE  AN  ACCURATE  GAUGE  AND  A  RELIABLE  SWITCH IS NEEDED. HOW TO ORDER Model A20T: Standard model with recessed hex socket contact adjustment.  May be sealed "Tamperproof".  Wiping contacts rated 2 amps @ 30 VAC/DC. Model A20T-K: Front nylon knob contact adjustment.  Rated 1 amp @ 125 V AC.  2 amps   @   30   V   AC/DC   Model   A20T-ES:   Environmentally   sealed. Internal 'breathing lung' of silicone inhales & exhales ambient gases & salt air.  Standard with hex socket contact adjustment.  Contacts rated 2 amps @ 30 V AC/DC. Model A20T-KES: Same as above with front knob contact adjustment.  Rated 1 amp @ 125 V AC.  2 amps @ 30 V. SPECIFICATIONS Dial: 2" dia.  dual scale, °F and °C. Case: 2-1/32" dia.  to fit S.A.E.  2-1/16" S.A.E.  hole In instrument panel. Bezel: Polished stainless steel.  Black, non-glare available. Range: 100-250F.  is standard.  Optional: -20-120,  90-160,  100-  220, 100-325.  200 to 450. Capillary Tube: Drawn   copper,   heavy   P.V.C.   armor   coat.      High   temperature soldered to SWICHGAGES^Ò  and thermal bulb ends.  Sealed with neoprene vibration dampeners.  Std.  length 48".  Available to 65 feet. Thermal Bulb: Copper, for rapid heat transier. Engine or Process Connector: 1/2"  plated  steel  is  standard.    See  catalog  engineering  print.    10-02- 163 for specs. on fittings from 1/4" N.P.T. with most metric & B.S.P. up to 3/4" N.P.T. Separable Thermowells: See catalog. Bulletin A20T-7974 Effective 5-15-79 Catalog Section 10 Class R Model A20T: EXCLUSIVE FEATURES ACCURATE GAUGE: 2% in operating range +PLUS+ VISIBLE, WIPING CONTACTS IN ONE UNITI! POLYCARBONATE/GLASS CASE. CORROSION & SHOCK PROOF. UNBREAKABLE LEXANS LENS "UNGROUNDED" CASE HAS INTEGRALLY     MOLDED     TERMINAL BLOCK AND SCREW TERMINALS.   Mechanics.    electricians,  maintenance  supervisors    and  OWNERS like   SWICHGAGES^Ò    simplicity   and   reliability.      They   can   SEE Temperature being measured: can SEE and test contact settings.   Built  to  take  vibration  and  shock  on  constant  duty  Diesel  engines, gives them stamina to 'take It' on any IOD In any climate.   THEY COST LESS!!! Compare parts and LABOR to install.  wire up and  give  maintenance  checks  on   SWICHGAGES  with  costs  of Less  accurate  electric  gauges,  gauge  senders  and  blind'  switch sensors.   SWICHGAGES Ò are adaptable to alarm, shutdown or automate any engine or electric motor powered machine CAUTION:    Temperature  sensing  bulb  must  be  emersed  in  water  or  some  other  medium  to  send temperature changes to the SWICHGAGES^Ò .  Loss c! water will leave the bulb dry which prevents the SWICHGAGES^Ò   from responding Quickly to increasing temperatures.  making it useless An L'52 level SWICHGAGES^Ò .  can De mounted at a minimum sate water level to shut-down equipment on rapid water loss.