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2-1/16
SERIES 3000MR & 3000MRS
E
PHOTOHELIC® SWITCH/GAGES
Combines Differential Pressure Gage with Low/High Set-Points, Compact Size
CALIBRATION SERVICES AVAILABLE
PRESSURE
1/8 FEMALE NPT HIGH
PRESSURE CONNECTION
1/8 FEMALE NPT LOW
E
O
D
I
V
O
N
L
I
N
Shown with optional -SS bezel
Backward compatible+ with Magnehelic® gage
PRESSURE CONNECTION
1-1/4
[31.75]
[50.80]
2-1/2
[63.50]
[52.39]
2
ø4-47/64
[120.25]
5/8 [15.88]
5/8 [15.88] PANEL MAX
3/16 [4.76]
ø5
[127.00]
[4] 6-32 HOLES EQUALLY SP
ON A 5-1/8 [130.18] B.C.
®
ø4 [101.60]
FACE
5-1/2 [139.70]
O.D. MOUNTING RING
Using solid state technology, the Series 3000MR & 3000MRS Photohelic® Switch/
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® gage design. Switch setting is easy to adjust with large
external knobs on the gage face. Gage reading is unaffected by switch operation will indicate accurately even if power is interrupted. Solid state design now results
in greatly reduced size and weight. Units can be ush 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).
BENEFITS/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
• Optional stainless steel bezel is the same installation diameter as Magnehelic® gage
and simplies eld upgrade to Photohelic® switch/gage
APPLICATIONS
• Pneumatic conveying
• Air conditioning systems
• Clean rooms
MODEL CHART
Model
Differential Pressure
Gages/Switches, Dial
3000MR-00
3000MR-0
3001MR
3002MR
3003MR
3005MR
3010MR
3015MR
3020MR
3030MR
3050MR
3100MR
Model
3000MR-60PA**
3000MR-125PA*
3000MR-250PA
3000MR-500PA
Model
3000MR-1KPA
3000MR-3KPA
3000MR-4KPA
Model
3000MR-6MM**
3000MR-10MM*
3000MR-25MM
3000MR-50MM
3000MR-100MM
Model
Range,
in w.c.
0-0.25
0-0.5
0-1.0
0-2.0
0-3.0
0-5.0
0-10
0-15
0-20
0-30
0-50
0-100
Range,
Pascals
0-60
0-125
0-250
0-500
Range,
kPa
0-1.0
0-3.0
0-4.0
Range,
mm w.c.
0-6
0-10
0-25
0-50
0-100
Range,
cm w.c.
Minor
Divs. Model
.005
.01
.02
.05
.10
.10
.20
.50
.50
1.0
1.0
2.0
Minor
Divs. Model
2.0
5.0
5.0
10.0
Minor
Divs. Model
.02
.10
.10
Minor
Divs. Model
.20
.50
.50
1.0
2.0
Minor
Divs. Model
3000MRS-00**
3000MRS-0*
3001MRS
3002MRS
3003MRS
3005MRS
3010MRS
3015MRS
3020MRS
3030MRS
3050MRS
3100MRS
3000MRS-60PA**
3000MRS-125PA*
3000MRS-250PA
3000MRS-500PA
3000MRS-1KPA
3000MRS-3KPA
3000MRS-4KPA
3000MRS-6MM**
3000MRS-10MM*
3000MRS-25MM
3000MRS-50MM
3000MRS-100MM
Range,
in w.c.
0-0.25
0-0.5
0-1.0
0-2.0
0-3.0
0-5.0
0-10
0-15
0-20
0-30
0-50
0-100
Range,
Pascals
0-60
0-125
0-250
0-500
Range,
kPa
0-1.0
0-3.0
0-4.0
Range,
mm w.c.
0-6
0-10
0-25
0-50
0-100
Range,
cm w.c.
3000MR-20CM 0-20 .50 3000MRS-20CM 0-20 .50
*±3% of full-scale. **±4% of full-scale.
Note: To order, select either MR or MRS sufx to Series 3000 number.
Examples: 3001MR or 3001MRS
DWYER INSTRUMENTS, LLC | dwyer-inst.com42
Minor
Divs.
.005
.01
.02
.05
.10
.10
.20
.50
.50
1.0
1.0
2.0
Minor
Divs.
2.0
5.0
5.0
10.0
Minor
Divs.
.02
.10
.10
Minor
Divs.
.20
.50
.50
1.0
2.0
Minor
Divs.
SPECIFICATIONS
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±2% of FS (3000-0 ±3% of FS). (3000-00 ±4% of FS).
Pressure Limit: -20˝ 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).
Process Connections: 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).
Weight: 1.8 Ib (816 g).
SWITCH SPECIFICATIONS 3000MR
Switch Type: Each set point has 1 form C relays (SPDT).
Relay Contacts: (Resistive load) 1 form C rated 1.0A @ 30 VDC, 0.3A
@ 110 VDC or 0.5A @ 125 VAC.
Gold over clad silver - suitable for dry circuits.
Electrical Connections: 18˝ (46 cm) cable assembly with 8 conductors. Optional
lengths to 100´ (30.5 m).
Power Requirements: 24 VDC, regulated ±10%.
Mounting Orientation: Diaphragm in vertical position. Consult factory for other
position orientations.
Set Point Adjustment: Adjustable knobs on face.
Compliance: CE.
SWITCH SPECIFICATIONS 3000MRS
Switch Type: Each set point has a solid state relay.
Switching Voltage: 20-280 VAC (47-63 Hz).
Switching Current: 1.0 amp (AC) max., 0.01 mA (AC) min., (2) SPST NO.
Electrical Connections: 18˝ (46 cm) cable assembly with 6 conductors, optional
lengths to 100´ (30.5 m).
Power Requirements: 24 VDC, regulated ±10%.
Mounting Orientation: Diaphragm in vertical position. Consult factory for other
position orientations.
Set Point Adjustment: Adjustable knobs on face.
Compliance: CE.
OPTIONS
To order
add sufx: Description
-HP
-LT
-MP
-NIST
-TAMP
-WP
-SS
High pressure; increases maximum rated pressure to 80 psig (5.5 bar)
Low temperature option; for use under 20°F (-6.7°C)
Medium pressure; increases maximum rated pressure to 35 psig (2.41
bar)
NIST traceable calibration certicate
Tamper-proof knobs; require spanner key (supplied) to change set
points
Weatherproof housing option
304 brushed stainless steel bezel.
standard Magnehelic® gage installation diameter
+
Backward compatible with
Example: 3001MR-SS
ACCESSORIES
Model Description
A-298
Flat aluminum bracket for ush mounting 3000MR/MRS
A-370
Mounting bracket ush mount 3000MR/MRS bracket. Bracket is then
surface mounted. Steel with gray hammertone epoxy nish
A-600
R/C snubber recommended for inductive loads like a solenoid or contactor
ACCESSORIES - STANDARD
Description
Mounting ring, snap ring, 18˝ (45 cm) cable assembly, (2) 3/16˝ tubing to 1/8˝ NPT
adapters, (2) 1/8˝ NPT pipe plugs, (4) 6-32 x 1-1/4˝ RH machine screws (panel
mounting), (3) 6-32 x 5/16˝ RH machine screws (surface mounting)
Process Tubing Options: See page 453 (Gage Tubing Accessories)
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