IMP120-17
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Differential Pressure Types J120K, H121K, H122K
Opposed Sensor Models 36-39, (S)147(B)-(S)157(B), 367
“Opposed sensor” differential pressure switches should be mounted
with their pressure connection in the horizontal position (See Figure
2). This will properly orient the 1/4” NPT venting conduit at the
bottom of the middle compartment (standardly supplied with plastic
plug).
Device with Manual Reset (Option 1530)
On models supplied with an external manual reset button, be sure to
leave sufficient finger space over the reset button for the operator to
reset the control.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING DEVICE.
WIRE DEVICE IN ACCORDANCE WITH LOCAL AND NATIONAL
ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE SIZE IS
14 AWG AND RECOMMENDED TIGHTENING TORQUE FOR FIELD WIRING
TERMINALS IS 7 TO 17 IN-LBS
ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAME-
PLATE MUST NOT BE EXCEEDED—OVERLOAD ON A SWITCH
CAN CAUSE FAILURE ON THE FIRST CYCLE.
FIELD WIRING MUST BE RATED 90°C MINIMUM. FOR AMBIENT
TEMPERATURES BELOW -10°C, USE SUITABLE FIELD WIRING.
THE EXTERNAL GROUNDING TERMINAL IS NOT TO BE USED
AS THE PRIMARY EQUIPMENT GROUNDING TERMINAL. THE
INTERNAL GROUNDING TERMINAL SHALL BE USED AS THE
PRIMARY EQUIPMENT GROUNDING MEANS AND THE EXTERNAL
GROUNDING TERMINAL IS ONLY FOR A SUPPLEMENTAL (SECONDARY)
GROUNDING CONNECTION WHERE LOCAL AUTHORITIES PERMIT OR
REQUIRE SUCH A CONNECTION.
TO PREVENT SEIZURE OF ENCLOSURE COVER, DO NOT
REMOVE LUBRICANT. THREADS SHOULD ALSO BE FREE OF
DIRT, ETC.
Remove cover and wire device (See Figure 3). Wire directly to the
terminal block. An internal grounding terminal is located near the
right-hand conduit opening. Replace cover and hand tighten to fully
engage cover O-ring.
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
TYPE J120 IS 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 device as a full assembly and
does not carry individual markings.
THE CONNECTION OF THE DEVICE SHALL BE MADE BY CABLE
ENTRIES OR A STOPPING BOX SUITABLE FOR THE CONDITIONS
OF USE AND CORRECTLY INSTALLED, AND CERTIFIED BY TYPE
OF EXPLOSION PROTECTION - FLAMEPROOF ENCLOSURE ‘d’.
ALWAYS HOLD A WRENCH ON THE PRESSURE HOUSING HEX
WHEN MOUNTING THE DEVICE. DO NOT TIGHTEN BY TURNING
THE ENCLOSURE AS THIS WILL DAMAGE SENSOR AND WEAKEN
SOLDER AND WELDED JOINTS.
VERTICAL MOUNTING (PRESSURE CONNECTION FACING DOWN,
SEE FIGURE 1A) IS RECOMMENDED; HOWEVER DEVICE CAN
BE MOUNTED IN ANY ORIENTATION WITH ADHERENCE TO
PREVIOUS WARNINGS AND EXCEPTIONS BELOW.
Mount device vertically (pressure connection facing down, see Figure
1A) or horizontally (see Figure 1B). Device may be surface mounted via
the four 1/4” screw holes on the enclosure or mounting bracket. It can
also be mounted directly to a rigid pipe using the pressure connection.
Type J120, J120K Models 520-525, 530-535
It is recommended that models 520-525 and 530-535 be mounted
vertically (pressure connection facing down, see figure 1A). If
horizontal mounting (see figure 1B) or vertical mounting (pressure
connection facing up) is required, set-point may shift (particularly
models 523, 533) and set-point adjustment is recommended. Consult
factory for additional information
Device with Breather Drain (Option M450)
Type J120, J120K Models 455-559
Mount with breather drain facing down (See Figure 1B). The conduit
connection must be “potted” for this type of installation.
Types H121, H122 & H122P, All Models
Mount in vertical position with pressure assembly and breather drain
facing down (See Figure 1A).
Figure 2
Opposed Sensor Models
Figure 1B
J120, J120K
Figure 1A:
H121, H121K, H122, H122K
