Orange Research 1502 Series User manual

GN128-Diaphragm Rev. 0 Orange Research Inc. Page 1 of 3
INSTRUCTIONS
Series 1502,1516,1518,1533,1831,1833,1835
DIFFERENTIAL PRESSURE INSTRUMENTS
Diaphragm Sensor
Your new Orange Research Differential Pressure Instrument is
a rugged instrument featuring simplicity of design to provide
dependable and efficient service. Because it is an instrument
it should be handled with care. Read all instructions carefully
before attempting to install the instrument.
CAUTION: Do not exceed maximum operating pressure
listed on instrument label. Use only fluids compatible
with wetted parts.
HOW IT WORKS
The instrument operates on the difference between two
pressures (delta-P). The sensing element is a spring biased
diaphragm which moves linearly in proportion to the difference
between two basic pressures. A magnet on the HI pressure
side of the piston assembly moves with the diaphragm and
rotates a follower magnet located adjacent to the pressure
cavity. The gauge pointer is located at the end of the rotary
magnet shaft and rotates with the magnet to provide gauge
readings proportional to differential pressure variations. This is
accomplished by the coupling forces between two adjacent
magnets through a solid wall.
Switch Units: On switch and indicating switch models, reed
switches are located adjacent to the pressure chamber and
are actuated when the diaphragm magnet field interacts at a
present point with the reed switch armature. Reed switch set
points are adjustable.
Transmitter Units: On transmitter models the transmitter
module is located adjacent to the pressure chamber. A Hall
Effect sensor interacts with the movement of the sensor
magnet.
Note:This instrument will provide ±2% accuracy full scale.
Caution: For models 1502 & 1533, always apply
pressure to the high side first. Reverse pressure may
damage the diaphragm.
INSTALLATION
Check instrument & identify HI and LO markings. HI identifies
the high pressure port; LO the low pressure port. If instrument
is installed backwards, it will neither operate nor be damaged.
The instrument can be line mounted, bracket mounted or
panel mounted depending upon the model purchased.
1516 Series shown –images vary by model
*Mounting Options:
1. Piping support: sometimes the piping supports our
instruments with no additional mounting required
2. Mounting holes: each unit has mounting holes to
support our instrument
3. Flanged “F-style” mounting case: contains holes around
the outside edge for panel mounting, order as an option
4. C-clamp: C-shaped clamp for mating “B-style” dial
cases to panel, order as an option
5. Mounting kit: multiple configurations for mating
instrument to flat surfaces or to pipes, order as an
option
* See our website for complete details on mounting our instruments.
Installation Notes:
Do not mount directly to steel surfaces…this could
affect the magnetic sensors…mounting 1 inch from
ferrous metals is recommended
If there is particulate in the line, insert a screen
(approx. 100 micron) to block the particulate from
becoming lodged in the instrument
Do not install on systems for highly viscous fluids or
where fluid may become hardened over time
Do not install on system with iron in the fluid…the iron
can become attached to the magnetic sensors
Install the unit above the process line to prevent
particulate settling in the instrument
We recommend isolating the instrument from the
system pressure using valves…3 or 5 way manifold
valves are common
Open valves connected to our instrument slowly, to
protect the diaphragm sensor from damage
Before installation, refer to our Specification Sheets
(on our website) to identify instrument component
materials & double check for chemical compatibility

GN128-Diaphragm Rev. 0 Orange Research Inc. Page 2 of 3
SWITCH ADJUSTMENT –No Enclosure
Reed switch set points are field adjustable. On Indicating Switches, the reed switches can be adjusted
over the top 80% of the gauge range. On Switch models the reed switches can be adjusted over the range
shown on the nameplates.
To change the reed switch setting, a source of pressure will be needed with the instrument. Loosen the
screw holding the reed switch. To increase the set point, slide the switch tube toward the LO port. To
decrease the set point, slide the switch tube toward the HI port. Repeat as required until new setting is
reached. Tighten the screw holding the switch tube in place and recheck the new actuation point.
CAUTION: Do not over tighten the switch holding screw-this is a cone point set screw and digs into the
tube with light pressure. (in some cases, it might be necessary to reverse the switch tube end for end to
locate the new actuation point-this is normal procedure.
SWITCH WIRE COLOR
-A SPST white and white
-B SPST green(N/C); blue(common)
-C SPDT green(N/C); red(N/O); blue(common)
HI LO
PORT PORT
SWITCH ADJUSTMENT –With Enclosure
Reed switch set points are field adjustable. On Indicating
Switches, the reed switches can be adjusted over the top 80% of
the gauge range. On Switch models the reed switches can be
adjusted over the range shown on the nameplates.
To change the reed switch setting, a source of pressure will be
needed with the instrument. Remove the switch enclosure and
loosen the set screw on the switch bracket. To increase the set
point, slide the switch tube toward the LO port. To decrease the
set point, slide the switch tube toward the HI port. Repeat as
required until the new setting is reached. Recheck the new
actuation point. Re-tighten set screw.
SWITCH WIRE COLOR
-A SPST white and white
-B SPST green(N/C); blue(common)
-C SPDT green(N/C); red(N/O); blue(common)
1 SWITCH
-A OR –B
2 SWITCHES
-A OR –B
1 SWITCH
-C
2 SWITCHES
-C & -C
1 –C SW. & 1
-A OR –B SW.
RELAY DPDT
–R2
MAINTENANCE
Other than replacing broken lens, there is only one area where this instrument may need attention.
Erratic pointer or switch action may indicate that cleaning is required.
LENS REPLACEMENT:
1. Insert pressure body into vise, protecting the body from damage, with dial facing upwards.
2. Remove bezel or ring:
Bezel: twist off SS bezel with strap wrench or similar device
Snap-ring or threaded ring: use small screwdriver to loosen ring and remove by hand
3. Remove lens and gasket.
4. Remove gauge from vise and turn upside down to remove any debris that may be present.
5. Re-install in vise and reassemble with new lens, make sure gasket is located under the lens.
POINTER REPLACEMENT:
1. Remove lens and gasket, using above instructions –with pressure body in vise & gauge pointed upward.
2. Note exact position of pointer with small pencil mark.
3. Remove old pointer with pointer puller or screwdriver, take care not to bend the pointer or the pointer pin as they are sensitive
components.
4. Install new pointer by hand, to line up with the pencil mark.
5. Rap the center of the pointer hub sharply, to set the pointer into the pin.
6. Erase small pencil mark & remove any debris.
7. Re-install lens, gasket and bezel.

GN128-Diaphragm Rev. 0 Orange Research Inc. Page 3 of 3
Transmitters
HOW IT WORKS: Orange Research Differential Pressure Transmitters provide a proportional electronic output from a
magnetically activated Hall Effect sensor. Pressure moves a magnetic piston inducing a polar bias in the sensor which
causes a voltage change. Microprocessor amplifies, conditions and buffers the input analog signal.
Remove Transmitter cover and refer to wiring connections diagrams. These instruments are reverse polarity protected to
protect the board.
ELECTRICAL CONNECTIONS:
COM
0-5V
+(EXC)
-
Supply Voltage: 9-35 VDC (reverse polarity protected)
Wire size: 20-26 AWG
Conduit connection: ½” trade size
Wiring Options:
WARNING: This product contains Nickel, a chemical known to the State of California to cause cancer. For more information
go to: www.p65warnings.ca.gov