UE B121 Installation And Maintenance Instructions Manual

Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of
Recommended Practices, Liabilities and Warranties. For functional safety applications, please refer to the safety manual which
can be downloaded from www.ueonline.com.
GENERAL
Misuse of this device May cause explosion and personal
injury. these instructions Must be thoroughly read and
understood before device is installed.
this device 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.
The device has been certified in accordance with the
applicable requirements of the following standards:
th
• iec 60079-0, 6 edition, revision date 2013/12
th
• iec 60079-1, 7 edition, revision date 2014/06
nd
• iec 60079-31, 2 edition, issue date 2013/11
• en 60079-0:2012+a11:2013
• en 60079-1:2014
• en 60079-31:2014
this device 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 db iic t6 gb
ii 2 d ex tb iiic t85°c db ip66
-40°C ≤ Tamb. ≤ + 75°C
to prevent ignition of hazardous atMospheres,
disconnect supply circuits before opening. Keep cover
tight while circuits are energized.
MaxiMuM teMperature* stated in literature and on naMe-
plate Must never be exceeded, even by surges in the
systeM. occasional operation of unit up to Max. teMper-
ature 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.
this device does not have any field replaceable parts.
any substitution of coMponents May iMpair suitability
for class i, division 1.
120 Series
Explosion-Proof Temperature and
Indicating Temperature Switches
and Controls
Local Mount Types B121, B122, C120
Remote Mount Types E121, E122, F120; 820E,
822E
SIL2
Certified
IMT120-12
www.ueonline.com
U N I T E D E L E C T R I C
C O N T R O L S

Installation and Maintenance

Instructions
the 120 series temperature switch utilizes either a liquid filled sensing stem
(immersion stem, direct mounting) or liquid filled sensing bulb (bulb & capil-
lary, 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,
e122,820e, 822e) according to the procedures outlined (see part ii -
adjustments)
please refer to the product technical brocures for product specifications.
product technical brochures may be found at www.ueonline.com.
ue declarations and third party issued certifications are available for
download at www.ueonline.com/prod_approval.
date code format on nameplate is "yyww" for year and week.
Part I - Installation
– screwdriver/adjustable wrench to 1 1/2"
TOOLS NEEDED
MOUNTING
to prevent electrostatic discharge, wipe down cover
and enclosure of any dust build up before reMoving
cover.
install device where shocK, vibr ation and
teMperature fluctuations are MiniMal. do not Mount
device in aMbient teMperatures that exceed the
liMits on the naMeplate for the appropriate area
Mount device to prevent Moisture froM entering
the enclosure. it is iMperative to use properly rated
explosion-proof sealing fittings for electrical wire
entry.
to prevent ignition of hazardous atMospheres, seal
conduit runs within 18 inches of enclosure
types c120, f120, 820e and 822e 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 plugging the unused
conduit opening. the explosion proof plug Must be properly
installed.
*plug is approved explosion-proof with the product as a full assembly and does not carry indi-
vidual markings.
do not KnocKout any plugs on explosion-proof types 820e
or 822e
IMT120-12