Dwyer Series AT23000MR/3000MRS ATEX Approved Photohelic® Switch/Gage

Product Description

3000MR or 3000MRS Series in Flame-Proof ATEX Enclosures

Using solid state technology, the Series AT23000MR and AT23000MRS ATEX Approved Photohelic® Switch/Gages combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage. Gage reading is unaffected by switch operation and will indicate accurately even if power is interrupted. AT23000MR series employ versatile electromechanical relays with low amperage ratings-ideal for dry circuits. For applications requiring high cycle rates, choose AT23000MRS models with SPST (NO) solid state relays. Easy to adjust set point indicators are controlled by knobs located on the gage face (accessible opening case after de-energizing instrument). All models provide both low and high limit control. Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig (1.725 bar). Optional construction is available for use to either 35 psig (2.42 bar) or 80 psig (5.51 bar). Flame-proof ATEX enclosures are available 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 3000MR/MRS for non-ATEX approved.

Product Applications

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

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, -60 Pa and ±4%
on -00 models.

Pressure Limits:

-20 in Hg to 25 psig
(-0.677 bar 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). Option LT low temperature to -20°F (28.8°C); Case: -76 to 140°F (-60 to 60°C). (Note:
Product temperature limits differ from case).

Power Requirements:

24 VDC,
regulated ±10%.

Electrical Wiring:

Screw terminals.

Mounting Orientation:

Diaphragm in
vertical position.

Dial Size:

4″ (101.6 mm).

Set Point Adjustment:

Adjustable
knobs on face behind enclosure cover.
Follow instructions and safety warnings
to open cover.

SWITCH SPECIFICATIONS (3000MR)

Switch Type:

Each setpoint has 1
Form C relay (SPDT).

Relay Contacts:

(resistive load) 1
Form C rated 1.0 A @ 30 VDC, 0.3 A
@ 110 VDC or 0.5 A @ 125 VAC. Gold
over clad silver – suitable for dry
circuits.

SWITCH SPECIFICATIONS

Switch Type:

Each setpoint has a
solid state relay.

Switching Voltage:

20 to 280 VAC (47
to 63 Hz).

Switching Current:

1.0 amp (AC)
max., 0.01 mA (AC) min., (2) SPST
NO.

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:

Two 1/2″
FNPT. Cable gland not included.

Weight:

12.5 lb (5.7 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

• Gage reading unaffected by switch operation and will continue to read pressure even during power loss
• Zero and range adjustments outside of gage means no disassembly in normal service
• Solid-state design allows for switching in high cycle rate applications without degradation
• 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

Literature

Manuals

• Instruction Manual (AT23000MR)
• Instruction Manual (AT23000MRS)

Catalog Pages

Series AT23000MR/3000MRS Catalog Page

Approvals

ATEX Certificate

Drawings

• Adobe Reader in format .PDF
• CAD Drawing in format .DWG

Model Chart