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The Series 3000MR and 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®
design. Switch setting is easy to adjust with large external
knobs on 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 flush mounted in 4 l3/16"
(122 mm) hole 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 cable assemblies for electrical
connections.
Gage accuracy is ±2% of full scale and switch repeatability
is ±1%. Switch deadband is one pointer width - less than 1% of
full scale. 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).
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PHYSICAL DATA
Maximum Pressure: 25 psig (1.72 bar)
Media Compatibility: air and non-combustible, non-corrosive gases
Accuracy: ±2% of full scale
Operating Temperature: 20-120°F (-6.7 to 48.9°C) (dry air)
Finish: Baked dark gray epoxy hammerloid
Weight: 1 lb., 10 oz. (.74 kg)
Pressure Connections: l/8-27 NPT female (duplicated side and
back)
Power Supply: 24 VDC, regulated
Electrical Connections: 18" cable assembly with 8
conductors,
3000 MR Models
Relay Contacts:
(resistive load) |
2 SPDT rated 1.0 amp @ 30 VDC, 0.3 amp @ 110 VDC or 0.5 amp @
125 VAC. Gold over silver - suitable for dry circuits. |
3000MRS Models
| Switching Voltage: |
20-250 VAC (47-440 Hz)
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Switching Current:
(AC only)
(2) SPST, N.O |
0.8 amp (AC) max. up to 40°C (104°F)
0.6 amp (AC) max. up to 48°C (120°F)
0.5 mA (AC) min.
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Accessories
Mounting ring, snap ring (4) 6-32 x 1 ¼" RH machine screws
18" (45 cm) cable assembly (panel mounting) (2) 3/16" tubing
to 1/8" NPT (3) 6-32 X 5 / 1/16" RH machine screws (2)
1/8" NPT pipe plugs (surface mounting)
OPTIONS
Tamper Proof Knobs, require spanner type key (supplied) to change
setpoints.
Low Temperature Option for operation under 20°F (-6.7°C).
MP and HP Options increase rated pressure to either 35 or 80
psig.
R/C Snubber: Recommended for inductive (solenoid or contactor)
loads. Specify part no. A-600.
SUGGESTED
SPECIFICATIONS
Differential pressure switches shall incorporate gages and setpoint
indicators for continuous indication of applied pressure and switch
settings. Units shall be diaphragm operated with switching accomplished
by phototransistor controlled (SPDT electro-mechanical relays)(solid
state switches). Setpoint shall be controlled by knobs on front of unit.
Switch/gages shall be Dwyer Instruments, Inc., Series 3000(MR)(MRS)
Photohelic Catalog No. reading to " w.c. in " divisions.
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