Dwyer 608 Series Differential Pressure Transmitter Instruction Manual
- June 13, 2024
- Dwyer
Table of Contents
Dwyer 608 Series Differential Pressure Transmitter
Product Information
The Series 608 Differential Pressure Transmitter is a versatile device designed for measuring differential pressure in clean/dry air and compatible gases. It is suitable for use with aluminum,titanium, PBT, buna, silicone, glass, gold, silicone RTV, and stainless steel materials. The transmitter is not intended for use with liquids and requires an approved intrinsically safe barrier for use in hazardous locations.
Specifications:
- Position: The transmitter is not position sensitive, but it is recommended to avoid mounting with pressure connections pointing up to prevent condensed moisture from entering the interior. Tubing should be routed with a low point just ahead of the transmitter to avoid moisture accumulation.
- Mounting: The transmitter should be attached to a mounting surface using two #8 or #10 screws in the provided mounting slots.
- Electrical Connection: The transmitter is FM approved intrinsically safe for use in hazardous locations. An approved intrinsic safety barrier must be used when applying the transmitter in hazardous areas. The barrier limits the electrical or thermal energy in the instrument loop to prevent ignition in the hazardous location.
- Load Limitations: The transmitter has a 4-20 mA output and has specific loop resistance limitations based on the loop supply voltage. Exceeding the specified supply voltage rating may result in permanent damage not covered by the warrant
Dimension
The SERIES 608 Differential Pressure Transmitter converts positive, negative (vacuum), or differential pressures of clean, dry air or other non-conductive, noncorrosive gases into a standard 2-wire, 4-20 mA output signal. Several factory calibrated models are available with ranges from 0-0.1 (0-2.5 mm) in w.c. up to 0-25 (0-634.4 mm) in w.c. All models employ a variable capacitance transducer with a micro-machined, ultra-thin silicon diaphragm enabling precision measurement and control of very low differential pressures while withstanding a high static working pressure of 100 psig (6.89 bar). The Series 608 is FM-approved and intrinsically safe for use in specified hazardous locations when used with an approved intrinsic safety barrier. It also features a NEMA 4X (IP65) enclosure that allows for indoor and outdoor installations. This rugged housing design makes this transmitter ideal for use in industrial and process plant environments.
INSTALLATION
- Location: Select a clean location free of excess vibration where the temperature of the unit will be between 0°F (-18°C) and 160°F (71°C). Distance from the receiver is limited only by total loop resistance. See “Electrical Connections”. The tubing supplying pressure to the transmitter can be run practically any distance. Long tubing lengths will not affect accuracy but response time will be increased slightly.
- Position: The Series 608 Transmitter is not position sensitive. However, it is recommended that you avoid mounting with pressure connections pointing up because of the chance of condensed moisture entering the interior. Moisture can also be avoided by routing tubing with a low point just ahead of the transmitter.
- Mounting: Attach to mounting surface with two #8 or #10 screws in the mounting slots provided.
- Pressure Connections: The 608 series transmitter is shipped with the “HIGH” and “LOW” pressure ports plugged to avoid debris entering the unit. The plugs should be left in place until the tubing and fittings are connected. For gage pressures, connect positive (above atmospheric) pressure to the port marked “HIGH” and vent the “LOW” port. To monitor vacuum, connect negative (vacuum) pressure to port marked “LOW” and vent the “HIGH” port. For differential pressure, connect the higher one to the “HIGH” port and the lower one to the “LOW” port.
The two 1⁄4˝ NPT pressure connections should be sealed to the transducer housing using teflon tape. The use of a dope-type sealant should not be used since it may cause measurement errors because of outgassing.
SPECIFICATIONS
- Service: Clean/dry air and compatible gases. Clean dry air/gases compatible with aluminum, titanium, PBT, buna, silicone, glass, gold, silicone RTV and stainless steel. Not for use with liquids.
- Wetted Materials: Consult factory.
- Accuracy: ±0.5% or ±0.25% full scale.
- Stability: ±0.5% F.S./year.
- Pressure Limits: 100 psig (6.89 bar); 15 psid (1.03 bar).
- Temperature Limits: -20 to 185°F (-28 to 85°C).
- Compensated Temperature Range: 0 to 160°F (-18 to 71°C).
- Thermal Effect: 0.5% Accuracy: ±0.02% F.S./°F; 0.25% Accuracy: ±0.01% F.S./°F.
- Power Requirements: 12-36 VDC (2-wire). B4-20 mA DC. Zero and Span Adustments: Potentiometers for zero and span.
- Response Time: 250 ms.
- Loop Resistance: DC: 0-1045 Ωs maximum.
- Electrical Connections: Screw terminal: Two 1/2˝ female NPT conduit.
- Process Connections: Two 1/4˝ female NPT.
- Enclosure Rating: NEMA 4X (IP65).
- Mounting Orientation: Not position sensitive.
- Weight: 2 lb (0.9 kg).
- Agency Approvals: FM approved intrinsically safe for use in Class I, Div. 1, Groups A, B, C, D; Class II, Div. 1, Groups E, F, G; Class III, Div. 1 when wired with approved intrinsically safe barrier. Entity parameters: Vmax= 36 VDC; Imax= 250 mA; CI=12 nF; LI=0 mH.
WARNING
- GENERAL: A failure resulting in injury or damage may be caused by excessive overpressure, excessive vibration or pressure pulsation, excessive instrument temperature, corrosion of the pressure containing parts, or other misuse. Consult Dwyer Instruments, LLC before installing if there are any questions or concerns.
- OVERPRESSURE: Pressure spikes in excess of the rated over-pressure capability of the transducer may cause irreversible electrical and/or mechanical damage to the pressure measuring and containing elements.
- STATIC ELECTRICAL CHARGES: Any electrical device may be susceptible to damage when exposed to static electrical charges. To avoid damage to the transducer observe the following:
- Ground the body of the transducer BEFORE making any electrical connections.
- When disconnecting, remove the ground LAST!
Note: The shield and drain wire in the cable (if supplied) are not connected to the transducer body, and are not a suitable ground.
ELECTRICAL CONNECTION
Use in hazardous location: The Series 608 transmitter is FM approved
intrinsically safe for use in hazardous locations. See specifications for
details. Intrinsically safe approved devices require the use of an approved
intrinsic safety barrier when applied in hazardous locations. The barrier
limits the amount of electrical or thermal energy in the instrument loop, to
the level which would not cause ignition in the hazardous location for which
it is rated. The barrier must be installed outside of the hazardous area and
properly wired to the transmitter according to Figure B. CAUTION: Do not
exceed the specified supply voltage rating. Permanent damage, not covered by
warranty, may result. This unit is not designed for AC voltage operation. The
terminal connections can be accessed by unscrewing the four cover screws and
removing the terminal block access cover. Bring cable wires in through one of
the 1/2˝ female NPT conduit connections, plugging the unused entry. Attach the
cable wires to the appropriate terminals. If polarity is inadvertently
reversed, the loop will not function properly but no damage will be done to
the transmitter because of internal circuit protection. The power required to
generate the 4-20 mA output signal depends on the loop resistance of the
circuit and is proportional to the resistance according to the graph and
formula in Figure C. The maximum length that can be used in the current loop
is a function of wire size and receiver resistance. A shielded two conductor
cable is recommended for control loop wiring. Make sure total loop resistance
is within the operating region as shown in Figure C. The transducer housing
should be earthed grounded at the ground screw using one of the cables
conductors as shown in Figures E and F.
Load Limitations 4-20 mA Output Only
- V min. = 12V + (.022A x RL)
- RL = RS + RW
- RL = Loop Resistance (Ωs)
- RS = Sense Resistance (Ωs)
- RW = Wire Resistance (Ωs)
CALIBRATION
Each Series 608 Transmitter is factory calibrated to the range listed in the
model number chart. The range is defined as that pressure which when applied
to the transmitter will produce a 20 milliamp current in the loop. Zero
pressure will produce 4 milliamps. If fine adjustment of calibration is
required, use the following procedure:
- With the transmitter connected to its companion receiver, insert a milliammeter 4 times more accurate than the accuracy of the transducer in series with the current loop. A controllable pressure source should be tied to the high-pressure port of the transmitter and to an accurate pressure gage or manometer.
- Apply electrical power to the system and allow 15 seconds for components to stabilize.
- With no pressure applied to the transmitter remove cover and adjust “zero” control so loop current is at 4 mA.
- Apply full span pressure and adjust loop current to 20 mA using “span” control.
- Remove the milliammeter from the circuit, replace cover, and place system in service.
MAINTENANCE
After final installation of the Series 608 Differential Pressure Transmitter, no routine maintenance is required. A periodic check of system calibration is suggested. These devices are not field repairable and should be returned if repair is needed (field repair should not be attempted and may void warranty). Be sure to include a brief description of the problem plus any relevant application notes. Contact customer service to receive a return goods authorization number before shipping.
ZERO ADJUSTMENT
The zero adjustment for the transducer can be accessed by unscrewing the four
cover screws and removing the zero pot access cover. Once the cover is
removed, make sure no contaminants, (e.g. water, oil, chemicals, grease, dirt,
etc.), enter the enclosure. The zero adjustment range is approximately ±10% of
span.
The offset or zero adjustment potentiometer is shown in Figure D. A hole is provided in the fiber insulation board to access the pot adjust-ment screw. Before you adjust,make sure a short tube is connected from the “low” port to the “high” port of the transducer. This connection will ensure that both ports are at the same pressure. A clockwise rotation raises the output.
Hazardous Area Specific Guidelines.
- Do not open unit when energized.
- Do not disconnect equipment unless area is known to be non-hazardous
FM Installation Notes
SEE DRAWING 71B319
Intrinsically-Safe Entity Barrier Parameters
Definition of Entity Concept: The entity concept allows the interconnection of
intrinsically safe apparatus to associated apparatus not specifically examined
in such combination. The criteria for interconnection is that the voltage and
current which an intrinsically-safeapparatus can receive and remain
intrinsically-safe, considering faults, must be equal to or greater than the
voltage and current levels which can be delivered by the associated apparatus,
considering faults and applicable factors. In addition, the maximum
unprotected capacitance and inductance of the IS apparatus, including the
inter-connecting wiring, must be equal or less than the capacitance and
inductance which can be safely connected to the associated apparatus.The
“entity parameters” were broadened to allow 608 users the freedom to apply the
608 into a wider array of applications. Additionally, the inclusion of a “no
incentive” rating gives our customers the ability to choose an intrinsically
safe barrier from any barrier manufacturer meeting the below ratings.
- IS / L.IL.II / 1 / ABCDEFG / 14 @ Ta=40°C max; Entity:
- NI / I,I,II / 2 / ABCDEFG / T4 @ Ta=40°C max; NIFW;
- Entity Parameters / Non-Incendive Field Wiring Parameter;
- Vmax=30Vdc, Imax= 100mA, Pmax=|W, Ci=50nF, Li=OUH
- DWYER INSTRUMENTS, INC
- MICHIGAN CITY, INDiANA, USA
Note -1 MAX JAFE AREA VOLTAGE NOT TO EXCEED 250 VRMS OR VDC.
NOTE -2 THE NONINCENDIVE FIELD WIRING CONCEPT ALLOWS THE INTERCONNECTION OF
NONINCENDING FIELD WIRING APPARATUS WITH ASSOCIATED NONINCENDIVE FIELD
APPARATUS USING ANY OF THE WIRING METHODS PERMITTED FOR NON-HAZARDOUS UNGR-
SSHEOLLOCATIOOR LOHEN: 10 OR Y. PC S Ymax, lo OR It 5 Imax, NOT REVISION
WITHOUT PRIOR FACTORY MUTUAL APPROVAL.
NOTE-4 INTRINSIC SAFETY BARRIERS MUST BE FACTORY MUTUAL APPROVED IN THIS
CONFIGURAT
NOTE-5 (ENTITY CONCEPT DEFINITION)
THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF INTRINSICALLY SAFE APPARATUS WITH
ASSOCIATED APPARATUS WHEN THE FOLLOWING IS TRUE:
Vmax or Ui ¿ Voc, Vt or Uo;
max or lie sc. it or lo:
Pmax or Pi> Po:
Ca 2 (
1 + Cable:
NOTE-6 CONNECT PER ANSI/ISA RP 12.6.
Note-7 NOR DIVISION I INSTALLATIONS, THE CONFIGURATION OF ASSOCIATED
PAPPARATISSHALLELEASEMITI
NOTE-8 FOR DIVISION 2 INSTALLATIONS USING NONINCENDIVE FIELD WIRING CONCEPTS,
THE ASSOCIATED APPARATUS SHALL BE FM APPROVEL UNDER THE ENTITY CONCEPT OR
NONINCENDIVE FIELD WIRING CONCEPT.
NOTE-9 WARNING – DO NOT OPEN WHEN ENERGIZED.
NOTE-10 WARNING – DO NOT DISCONNECT EQUIPMENT UNLESS AREA IS KNOWN O BE NON-
HAZARDOUS. NOTE-LL WARNING – SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY
FOR HAZARDOUS CLASSIFIED) LOCATIONS.
Contact
- Phone: 219-879-8000
- Fax: 219-872-9057
- www.dwyer-inst.com
- e-mail: info@dwyermail.com
References
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