IMT120-10
GENERAL
MIsuse of ThIs producT May cause explosIon and
personal Injury. These InsTrucTIons MusT be Thoroughly
read and undersTood before unIT Is InsTalled.
ThIs equIpMenT Is suITable for use In class I, dIvIsIon 1,
groups b, c and d; class II, dIvIsIon 1, groups e, f and g;
class III; or non-hazardous locaTIons only. enclosure
Type 4x, 7 & 9.
ThIs equIpMenT Is aTex cerTIfIed for equIpMenT caTegory
2. suITable for approprIaTe use In gas zone 1 & dusT
zone 21 applIcaTIons.
deMKo 09 aTex 0815573x
0539 Iecex ul 03.0001x
II 2 g ex d IIc T6 gb
II 2 d ex tb IIIc T85°c db Ip66
-40°c ≤ TaMb. ≤ + 75°c
These producTs do noT have any fIeld replaceable
parTs. any subsTITuTIon of coMponenTs May IMpaIr
suITabIlITy for class I, dIvIsIon 1.
To prevenT IgnITIon of hazardous aTMospheres,
dIsconnecT supply cIrcuITs before openIng. Keep cover
TIghT whIle cIrcuITs alIve.
The 120 series temperature switch utilizes either a liquid filled sens-
ing stem (immersion stem, direct mounting) or liquid filled sensing bulb
(bulb & capillary, remote mounting) to detect a temperature change. The
response at a pre-determined set point(s), actuates a spdT, dual spdT,
or dpdT snap-acting micro switch(es), converting the temperature signal
into an electrical signal. control set point(s) may be varied by turning
the adjustment hex (c120, f120) or the external knob(s) and pointer(s)
(b121, b122, e121, e122, e122p, 820e, 822e) according to the proce-
dures outlined (see part II - adjustments)
MaxIMuM TeMperaTure* sTaTed In lITeraTure and on naMe-
plaTe MusT never be exceeded, even by surges In The sys-
TeM. occasIonal operaTIon of unIT up To Max. TeMpera-
Ture Is accepTable (e.g., sTarT-up, TesTIng). conTInuous operaTIon
should be resTrIcTed To The desIgnaTed adjusTable range.
*Maximum Temperature - the highest temperature to which a sensing ele-
ment may be occasionally operated without adversely affecting set point
calibration and repeatability.
please refer to the product bulletins for product specifications. product
bulletin may be found at www.ueonline.com.
date code format on nameplate is “yyww” for year and week.
TOOLS NEEDED
– screwdriver/adjustable wrench to 1 1/2”
MOUNTING
The connecTIon of The devIce shall be Made by cable
enTrIes or a sToppIng box cerTIfIed In Type of explosIon
proTecTIon flaMeproof enclosure ‘d,’ suITable for The
condITIons of use and correcTly InsTalled.
To prevenT IgnITIon, seal all conduIT runs wIThIn 18 Inches
of enclosure.
always hold a wrench on The TeMperaTure housIng hex
when MounTIng unIT. do noT TIghTen by TurnIng enclosure.
ThIs wIll daMage sensor and weaKen solder or welded
joInTs.
InsTall unITs where shocK, vIbraTIon and TeMperaTure
flucTuaTIons are MInIMal. MounT unIT To prevenT MoIsTure
froM enTerIng The enclosure. IT Is IMperaTIve To use
properly raTed explosIon-proof sealIng fITTIngs for elecTrIcal
wIre enTry. do noT MounT unIT In aMbIenT TeMperaTures ThaT
exceed The lIMITs on The naMeplaTe for The approprIaTe area.
c120, f120, 820e and 822e enclosures are provIded wITh
Two 3/4” npT elecTrIcal conduIT openIngs, eITher of whIch
or boTh can be used durIng InsTallaTIon. a 3/4” explosIon
proof plug* Is provIded for properly sealIng The unused conduIT
openIng. The explosIon proof plug MusT be properly sealed
durIng producT InsTallaTIon.
do noT KnocKouT any plugs on explosIon-proof Types 820e
or 822e
remote mount types e121, e122, e122p & f120 temperature controls
can be mounted vertically (temperature assembly facing down) or horizon-
tally. The conduit connection must be properly sealed (potted) for horizontal
installation. controls may be surface mounted via the four 1/4” screw clear-
ance holes on the enclosure or through the use of a mounting bracket (see
Mounting dimensions).
*plug is approved explosion-proof with the product as a full assembly and does not carry indi-
vidual markings.
IMT120-10
120 Series Explosion-Proof
Temperature and Indicating
Temperature Switches and
Controls
Local Mount Types B121, B122, C120
Remote Mount Types E121, E122, E122P, F120;
820E, 822E
Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of
Recommended Practices, Liabilities and Warranties.
Installation and Maintenance
Instructions
Part I - Installation
