Page 1
SERIES 3000MR/3000MRS | PHOTOHELIC® SWITCH/GAGE
FEATURES/BENEFITS
• 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
• Optional stainless steel bezel is the same installation diameter as Magnehelic
gage and simplifies field upgrade to Photohelic® switch/gage
APPLICATIONS
• Pneumatic conveying
• Air conditioning systems
• Clean rooms
®
DESCRIPTION
Using solid state technology, the SERIES 3000MR & 3000 MRS Photohelic® Switches/Gages
combine the functions of a precise, highly repeatable differential pressure switch with a large
easy-to-read analog pressure gage employing the durable, time-proven Magnehelic
design. Switch setting is easy to adjust with large external knobs on the gage face. Gage reading
is unaffected by the switch operation will indicate accurately even if power is interrupted. Solid
state design now results in greatly reduced size and weight. Units can be flush mounted or
surface mounted with hardware supplied. 3000MR models employ versatile electromechanical
relays with gold over silver contacts – ideal for dry circuits. For applications requiring high cycle
rates, choose 3000MRS models with SPST (N.O.) solid state relays. All models provide both low
and high limit control and include 18-inch (45 cm) cable assemblies for electrical connections.
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).
®
gage
Note: Shown with optional -SS bezel.
Backward compatible with Magnehelic® gage.
DWYER INSTRUMENTS, INC.
Page 2
GAGE SPECIFICATIONS
Wetted Materials
Accuracy
Pressure Limit
Temperature Limits
Process Connections
Weight
Relay Contacts
Electrical Connections
Power Requirements
Set Point Adjustment
Agency Approvals
Switching Current
Electrical Connections
Power Requirements
Set Point Adjustment
Agency Approvals
Service Air and non-combustible, compatible gases.
Consult factory.
±2% of FS (3000-0 ±3% of FS). (3000-00 ±4% of FS).
-20" Hg to 35 psig (-0.677 bar to 1.72 bar). MP option: 35 psig (2.41 bar), HP option: 80 psig (5.52 bar).
20 to 120°F (-6.67 to 48.9°C).
1/8" female NPT (duplicated side and back).
Size 4" (101.6 mm) dial face, 5" (127 mm) OD x 3-1/8" (79.38 mm); -SS Bezel: 4-3/4" (120.7 mm) OD x 2-21/32" (67.5 mm).
1.8 lb (816 g).
3000 MR SWITCH SPECIFICATIONS
Switch Type Each set point has 1 form C relays (SPDT)
(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.
18" (46 cm) cable assembly with 8 conductors. Optional lengths to 100' (30.5 m).
24 VDC, regulated 10%.
Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations.
Adjustable knobs on face.
CE.
3000MRS SPECIFICATIONS
Switch Type Each set point has a solid state relay.
Switching Voltage 20 to 280 VAC (47 to 63 Hz).
1.0 A (AC) max., 0.01 mA (AC) min., (2) SPST NO.
18" (46 cm) cable assembly with 6 conductors, optional lengths to 100' (30.5 m).
24 VDC, regulated ±10%.
Mounting Orientation Diaphragm in vertical position. Consult factory for other position orientations.
Adjustable knobs on face.
CE.
DWYER INSTRUMENTS, INC.
Page 3
DIMENSIONS
WIRING DIAGRAM
3000MR 3000MRS
DWYER INSTRUMENTS, INC.
Page 4
HOW TO ORDER
Use the bold characters from the chart below to construct a product code
3001 MR -SS
SERIES/RANGE
3001 - 0 to 1 in w.c.
3002 - 0 to 2 in w.c.
3003 - 0 to 3 in w.c.
3004 - 0 to 4 in w.c.
3005 - 0 to 5 in w.c.
3201 - 0 to 1 psid
3202 - 0 to 2 psid
3203 - 0 to 3 psid
3204 - 0 to 4 psid
3205 - 0 to 5 psid
3000XX-125PA - 0 to 125 Pa
3000XX-250PA - 0 to 250 Pa
3000XX-500PA - 0 to 500 Pa
3000XX-60PA - 0 to 60 Pa
ACCESSORIES
Model Description
A-298
A-320-B
A-370
A-600
Flat aluminum bracket for flush mounting Photohelic® and Capsuhelic® gages, 603A, 605, and 3000MR
Enclosure for 3000MR/MRS Photohelic® Switch/Gage, 605 Magnehelic® DP Transmitter, DH3 Digihelic® Pressure Controller, 2000 Magnehelic®
Gage with medium and high pressure options, 4-13/16" (122.24 mm)
Flush mount bracket used with: Photohelic® 3000MR/MRS, Capsuhelic®, 631B Transmitter, EDA. Bracket is then surface mounted. Steel with gray
hammertone epoxy finish
R/C snubber (recommended for inductive loads like a solenoid or contactor)
OPTIONS
AT - Aluminum tag
BUNA - Buna-N elastomers
COO - Certificate of origin
EXPL - Explosion-proof housing
with breather and drain
HP - High pressure
M - Mirror scale overlay
SS - 304 brushed stainless steel
WP - Weatherproof housing
RELAY TYPE
MR - Electromechanical relays
MRS - Solid state relays
Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest
version of the relevant information to verify, before placing any orders, that the information being relied upon is current.
DWYER INSTRUMENTS, INC.
DS-3000MR/3000MRS | 7/17
Loading...