Series AT3A3000 ATEX Approved Photohelic® Switch/Gages

Photohelic® Switch/Gages in Flame-Proof ATEX Enclosures

Flame-proof ATEX approved SERIES AT3A3000 Photohelic® Switch/Gages, function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Photohelic® switch/ gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 psig (2.4 bar) or 80 psig (5.5 bar). Two phototransistor actuated, DPDT relays are included for low/high limit control. Easy to adjust set point indicators are controlled by knobs located on the gage face (accessible opening case after de-energizing instrument). Set points can be interlocked to provide variable dead band– ideal for control of fans, dampers, etc. Gage reading is continuous and unaffected by switch operation, even during loss of electrical power. Flame-proof ATEX enclosures are available in aluminum with glass window which allows for viewing of set point needles and process pressure.

Important notes for installation:
• Cables must be fitted through 1/2" NPT cable gland or ATEX conduit (not supplied with instrument).
• Make sure after cabling to close tight cover and cable gland, in order to keep IP66 rating (IP65 with option OPV, overpressure relief valve).
• Open cover only after de-energizing instrument.
• Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.

Please see SERIES A3000 for non-ATEX approved.

California Residents:  Click Here for Proposition 65 WARNING.

Product Applications

  • Hazardous area pressure measurement and switching
  • Air conditioning systems
  • Clean rooms
  • Fume exhaust systems

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

Service:
Air and non-combustible, compatible gases.
Wetted Materials:
Consult factory.
Accuracy:
±2% of FS at 70°F (21.1°C); ±3% on -0 and ±4% on -00 models.
Pressure Limits:
-20 in Hg to 25 psig (-0.677 to 1.72 bar). MP option; 35 psig (2.41 bar), HP option; 80 psig (5.52 bar).
Temperature Limits:
20 to 120°F (-6.67 to 48.9°C) LT low temperature option to -20°F available; Case: -76 to 140°F (-60 to 60°C) (Note: Product temperature limits differ from case).
Dial Size:
4" (101.6 mm).
Mounting Orientation:
Diaphragm in vertical position.
Set Point Adjustment:
Adjustable knobs on Photohelic® gage face behind enclosure cover. Follow instructions and safety warnings to open cover.
SWITCH SPECIFICATIONS:
Switch Type:
Each setpoint has 2 Form C relays (DPDT).
Repeatability:
±1% of FS.
Electrical Rating:
10 A @ 120 VAC, 6 A @ 240 VAC, 60 Hz res. 10 A @ 28 VDC.
Electrical Wiring:
Screw terminals.
Power Requirements:
120 VAC, 50/60 Hz; 240 VAC & 24 VAC power optional.
Enclosure Rating:
IP66. IP65 with option OPV, overpressure relief valve.
Housing material:
Aluminum.
Finishing:
Texture epoxy coat RAL7038.
Pressure Connections:
1/8" NPT female brass (SS optional). In presence of acetylene it is necessary to use SS.
Electrical Connections:
Three 1/2" FNPT. Cable gland not included.
Weight:
28.4 lb (12.9 kg).
ATEX Approved Products from Comhas with ECN:
BVI 14ATEX0072.
Agency Approvals:
CE 1370 II2 GD Ex d IIC Gb T6; -60°C ≤ Ta ≤ +60°C Ex tb IIIC Db T 85°C.

Features

  • 3-in-1 ATEX approved instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
  • Flame-proof ATEX enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to process pressure and set point status

Videos

Model Chart

EXAMPLE

AT3

A3001

120VAC

X

X

X

A

B

1

X

T2

Series AT33001-120VAC-XXX-AB1XT2 Photohelic® Gage with ATEX Enclosure, 0-1" w.c., 120 VAC, 15 psig, aluminum housing, blind top cover, 1/8" npt female brass pressure port, standard overpressure plug, stainless steel tag 

SERIES

AT3

   

 

 

 

 

 

 

 

 

 

Photohelic® Gage with ATEX Enclosure 
































RANGE

 

3000-00N
3000-00
3000-0
3001
3002
3003
3004
3005
3006
3008
3010
3015
3020
3025
3030
3040
3050
3060
3080
3100
3150
3300-0
3301
3302
3304
3310
3320
3330
3000-00AV
3000-0AV
3001AV
3002AV
3010AV
3201
3202
3203
3204
3205
3210
3215
3220
3230     
3000-6MM 
3000-10MM
3000-25MM
3000-50MM
3000-80MM
3000-100M    
3300-20MM
3300-30MM    
3000-15CM
3000-20CM
3000-25CM
3000-50CM
3000-80CM
3000-100CM
3000-150CM
3000-200CM
3000-250CM
3000-300CM
3300-4CM
3300-10CM
3300-20CM
3300-30CM
3000-60PA
3000-125PA
3000-250PA
3000-500PA
3000-750PA
3300-120PA
3300-250PA
3300-500PA
3000-1KPA
3000-1.5KPA
3000-2KPA
3000-3KPA
3000-4KPA
3000-5KPA
3000-8KPA
3000-10KPA
3000-15KPA
3000-20KPA
3000-25KPA
3000-30KPA
3300-1KPA
3300-3KPA
3000-20MBAR
3000-100MBAR
3000-500MBAR
36003S
36006S
36010S

 

 

 

 

 

 

 

 

 

.05-0-.2" w.c.
0-0.25" w.c.
0-0.5" w.c.
0-1" w.c. 
0-2" w.c. 
0-3" w.c. 
0-4" w.c. 
0-5" w.c. 
0-6" w.c. 
0-8" w.c. 
0-10" w.c.
0-15" w.c.
0-20" w.c.
0-25" w.c.
0-30" w.c.
0-40" w.c.
0-50" w.c.
0-60" w.c.
0-80" w.c.
0-100" w.c.
0-150"w.c.
.25-0-.25" w.c.
.5-0-.5" w.c.
1-0-1" w.c.
2-0-2" w.c.
5-0-5" w.c.
10-0-10" w.c. 
15-0-15" w.c.
0-.25" w.c. & 300-2000 fpm av
0-.5" w.c. & 500-2800 fpm av
0-1" w.c. & 500-4000 fpm av
0-2" w.c. & 1000-5600 fpm av
0-10" w.c. & 2000-12500 fpm av
0-1 psid
0-2 psid
0-3 psid
0-4 psid
0-5 psid
0-10 psid
0-15 psid
0-20 psid
0-30 psid
0-6 mm w.c. 
0-10 mm w.c. 
0-25 mm w.c. 
0-50 mm w.c. 
0-80 mm w.c. 
0-100 mm w.c. 
10-0-10 mm w.c.
15-0-15 mm w.c.
0-15 cm w.c.
0-20 cm w.c.
0-25 cm w.c.
0-50 cm w.c.
0-80 cm w.c.
0-100 cm w.c.
0-150 cm w.c.
0-200 cm w.c.
0-250 cm w.c.
0-300 cm w.c.
2-0-2 cm w.c.
5-0-5 cm w.c.
10-0-10 cm w.c.
15-0-15 cm w.c.
0-60 Pa
0-125 Pa
0-250 Pa 
0-500 Pa 
0-750 Pa
60-0-60 Pa
125-0-125 Pa
250-0-250 Pa
0-1 kPa
0-1.5 kPa
0-2 kPa
0-3 kPa
0-4 kPa
0-5 kPa
0-8 kPa
0-10 kPa
0-15 kPa
0-20 kPa
0-25 kPa
0-30 kPa
0.5-0-0.5 kPa
1.5-0-1.5 kPa
0-20 mbar
0-100 mbar
0-500 mbar
0-30 psi single pressure bourdon tube
0-60 psi single pressure bourdon tube
0-100 psi single pressure bourdon tube


 POWER

 

 

120VAC
240VAC

24VAC 

 

 

 

 

 

 

 

 

120 VAC
240VAC
24VAC 


PRESSURE RATING

 

 

 

X
MP
HP

 

 

 

 

 

 

 

Standard Construction
Medium Pressure
High Pressure 

CONSTRUCTION

 

 

 

 

X

 

 

 

 

 

 

Standard

TEMPERATURE RATING

 

 

 

 

 

X
LT

 

 

 

 

 

Standard
Low Temperature Option 

HOUSING MATERIAL

 

 

 

 

 

 

A

 

 

 

 

Aluminum 

COVER               B
O
      Blind Top Cover
Glass Top Cover
PRESSURE CONNECTION                 1
2
    1/8" NPT Female Brass Pressure Port
1/8" NPT Female Stainless Steel Port
OVERPRESSURE PLUG                   X
OPV
  Standard without Overpressure Relief Valve
Overpressure Relief Valve material same as port
TAG                     T2 Stainless Steel Tag

Product Literature

Manuals

Catalog Pages

Approvals

Drawings

Questions

Question
What restrictions, if any, are imposed for the Magnehelic® and Photohelic® gages in vacuum service?
Answer
In applications involving higher vacuums than 20" Hg, leakage due to gage housing porosity becomes the limiting factor.

Photo Downloads

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