etted Materials: Nylon reinforced Buna-N and steel. PTFE and 316 SS
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ptional.
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emperature Limits: -30 to 150°F (-35 to 66°C).
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Pressure Limit: See model chart.
Enclosure Rating: General purpose. Weatherproof and explosion-proof optional.
Switch Type: SPDT mercury switch or SPDT snap switch. Other switch types
Electrical Connections: Screw terminal.
Conduit Connection: 7/8˝ (22.23 mm) hole for 1/2˝ (12.7 mm) conduit hub.
Process Connection: 1/4˝ female NPT.
Mounting Orientation: Vertical for mercury switch models, any position for snap
switch models.
Set Point Adjustment: External screw.
Weight: General purpose: 2 lb (0.9 kg).
Deadband: See model chart.
Agency Approvals: CE, UL, CSA. For FM consult factory. (Mercury switch units
are not CE approved.)
OPERATING RANGES – TYPE AP
With Snap Switch (mm w.c.), [bar]
Single SPDTSnap Switches
Max. Approx. Switch Deadband
Range AdjustablePress.
Number RangepsigLowHighLowHigh
3310˝ vac-50 in w.c. 158 in w.c. 10 in w.c. 4.5 in w.c. 5 in w.c.
RUManual reset – operates on decrease automatically. NEMA-1 only.ULCSA
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S
TWeather-proof enclosure, NEMA-4.
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WWeather-proof enclosure with condensate drain, NEMA-2, 3R.ULCSA
HExplosion-proof enclosure, NEMA-7, 9, Class I Group, C & D; Class II Group E, F & G.UL
A variation in control pressure causes the diaphragm to actuate the hermetically
sealed mercury switch to open or close the electrical contact.
PPLICATION
A
ype AP with suffix numbers -153, -2, -3, -26, -36, -88, -89 are for use with
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ediums not injurious to steel, silver solder or Fairprene diaphragm.
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ype AP and AP-41with Suffix No’s.
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53, -2, -3, -26, 36, -88, -89
1
PERATION
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A variation in control pressure causes the diaphragm to actuate the snap action
switch.
PPLICATIONS
A
ype AP, APH, APW, APWT with suffix numbers 7021-153 or 8021-153 are for use
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ith mediums not injurious to steel, silver solder, Nylon/Buna-N diaphragm.
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Type AP-41 with suffix numbers -153, -2, -3, -26, -36, -88, -89 are for use with
mediums not injurious to 316 SS and PTFE.
OUNTING
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nstall control firmly in a LEVEL POSITION on a panel or smooth wall surface by
I
eans of two mounting ears. Where pipe mounting is desired, control may be
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connected by means of the 1/4˝ I.P.S. connection. Do not mount control by
twisting the case; use a wrench on the square part of the 4˝ bottom pipe
connection. To level, sight across the two cover screws or check the lower end of
the glass opening in the cover to see that instrument is lined up horizontally.
IRING
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ire in accordance with local electrical codes or equipment manufacturers’
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instructions. See nameplate attached to inside of control case for terminal markings
and electrical rating. Do not overload. Do not oil any parts. Do not tamper with
switch wires. Position of these wires is essential for proper operation. Tampering
with these wires will void warranty.
Type AP, APH, APW, APWT with suffix numbers 7041-153 or 8041-153 are for use
with mediums not injurious to 316 SS and PTFE covered diaphragm.
OUNTING
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ount in any position.
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Type AP (general purpose) can be installed on a panel or smooth surface using the
two mounting ears or the 4˝ NPT bottom connection. Do not mount by twisting
the case; use a wrench on the square part of the 4˝ bottom pipe connection.
ype APW-NEMA 3 (weather-resistant): 4˝ male NPT bottom connection.
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ype APWT-NEMA 4 (water-tight): 4˝ male NPT bottom connection.
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Type APH (explosion-proof ): 4˝ male NPT bottom connection. Or use mounting
bracket No. PP-135-95
IRING
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ire in accordance with the national Electrical code and local regulations. Observe
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iring diagram inside enclosure and details below for type No. and electrical rating.
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Where control is connected directly into the load circuit, it must be wired into hot
side of line. Do not overload. Do not oil any parts.