OverviewPerformance Specs Ordering Specs

77A 77C 77B 77D Straight MgO insulated thermocouple probe including 1/4" dia. lead adaptor as required Straight MgO insulated thermocouple probe with quick disconnect plug and jack Rigid MgO insulated thermocouple probe with welded 1/2 x 1/2 NPT fitting Spring Loaded MgO insulated thermocouple probe for mounting in thermowell* *Note: thermowell not included, see data sheet T-WELLS   SHEATH DIAMETER 2 1/8" ( 77A Requires Transition - 1.75 x 0.25) 3 3/16" (Style A or B only, Dual 77A Requires Transition - 1.75 x 0.25) 4 1/4" (Required for 77D)   SHEATH MATERIAL S I O 316 SS Inconel 600 Other (77A or C only; no transition)   ANSI TYPE THERMOCOUPLE (special limits of error) Single J T K E Dual JJ TT KK EE Iron Constantan Copper Constantan Chromel Alumel Chromel Constantan      PROBE LENGTH (see drawings above) 77A w/o adaptor, “L”= 2" min. 77A w/adaptor, 77B and 77C, “L”=0.5"min.    STEM LENGTH IN THERMOWELL - see drawings below - Bore Depth “A” in.      TYPE OF JUNCTION G Grounded Junction U Ungrounded Junction X Exposed Junction (N/A on 77D)   CONNECTION HEAD (see table below) Code D, No head, Required for 77A and 77C    PROBE LAG HARDWARE (77D Only) (drawings below)  (1/2 NPT Fittings, stainless steel unless noted.) A Hex Nipple is 3/4" long standard. Specify as “A”, (standard) BX (Straight Nipple), specify X=1/8", 1/2", 1" + 1" increments EX (Aluminum Union/Nipple Extension), specify X=min. 3" plus 1" increments FX Same as EX (stainless union) GX (Coupling/nipple extension), black iron, Specify X=min. 3" + 1" increments HX (Union/nipple extension), black iron, specify X=min. 3" + 1" increments JX (Close nipple, galvanized unsealed parting coupling, nipple extension) black iron, specify x=min. 1 1/2" + 1" increments (shortest “union”) KX (Straight nipple) black iron, specify x=1/8", 1/2", 1", + 1" incr. (CREDIT)   LEAD LENGTH (Specify in inches) (4" leads with connection head standard) (12" Leads with 77A standard) 77B – 4 – S – K – 4 – U – A   –   4 – Typical write-up for 77D 77A* – 3 – S – T – 10 – U – D – 60 – Typical for 77A (*or 77C) 77D – 4 – S – K – 8 – U – A – B3 – 4 – Typical write-up for 77D   NEMA 4 w/gasket  Illustrations on Data Sheet T-WELLS/ACCESSORIES CODE  to order with sensor:  to order alone:   Conduit Max. Temp A  Small cast aluminum head  P/N 51590-1   1/2 NPT 125°C B  High temp. small cast aluminum head  P/N 51590-2   1/2 NPT 260°C C  Cast Iron head  P/N 51840-1   3/4 NPT 260°C D  For no connection head specify “D”         E  Large cast aluminum head  P/N 52298-1   3/4 NPT 260°C F  Economy conduit body  P/N 41438   1/2 NPT 125°C G  Explosion proof small cast aluminum head  P/N 41333-1   1/2 NPT 125°C H  High temp. expl. proof small cast alum. head  P/N 41333-2   1/2 NPT 260°C I  Hinged plastic  P/N 54684   3/4 NPT 125°C J  Hinged cast aluminum  P/N 54681   3/4 NPT 125°C K  Din B cast aluminum  P/N 55261   1/2 NPT 100°C S  Other (please specify when ordering)         T  Transmitter, specify or supply w/head         Terminals: All heads include at least 4 two-screw strap terminations. 6 can be requested in styles “C” and “E”. Style “K” includes 6 two-screw post straps. Styles “A”, “B”, “G” & “H” can have up to 8 screw-in post straps.

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