Dwyer Instruments 608 Series Installation and operating instructions

Series 608 Differential Pressure Transmitter
Specications - Installation and Operating Instructions
Bulletin E-60
The SERIES 608 Differential Pressure Transmitter converts positive, negative
(vacuum), or differential pressures of clean, dry air or other non-conductive, non-
corrosive 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 intrinsically safe
for use in the specied 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
1. 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.
2. 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.
3. Mounting: Attach to mounting surface with two #8 or #10 screws in the mounting
slots provided.
4. 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 ttings 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 teon 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).
Output Signal: 4-20 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.
1/4
[6.35]
3
[76.20]
2-11/16
[68.26]
4-1/2
[107.95]
3-1/4
[82.55]
5-1/32
[127.79]
1/2 NPT
TYP 2
PLACES
5/8
[15.88]
1-1/2
[38.10]
1/4 NPT
TYP 2
PLACES
DWYER INSTRUMENTS, LLC
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [email protected]
1. 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.
2. 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.
3. 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.
Read before insstallation.
WARNING
®

ELECTRICAL CONNECTION
Use in hazardous location: The Series 608 transmitter is FM approved intrinsically
safe for use in hazardous locations. See specications 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 specied 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.
Figure C
Figure B
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. Range is dened 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 ne adjustment of calibration is required, use the following procedure:
1. 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.
2. Apply electrical power to the system and allow 15 seconds for components to
stabilize.
3. With no pressure applied to the transmitter remove cover and adjust “zero”
control so loop current is at 4 mA.
4. Apply full span pressure and adjust loop current to 20 mA using “span” control.
5. Remove the milliammeter from the circuit, replace cover, and place system in
service.
MAINTENANCE
After nal 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 eld repairable and should be returned if repair is needed (eld 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.
Load Limitations 4-20 mA Output Only
1250
1045
1000
750
545
500
250
0
010 12 20 24 30 36 40
OPERATING
REGION
LOOP RESISTANCE ()
LOOP SUPPLY VOLTAGE (VDC)
HAZARDOUS CLASSIFIED
LOCATION
NON-HAZARDOUS
(UNCLASSIFIED) LOCATION
"ASSOCIATED
APPARATUS
WITH ENTITY
PARAMETERS"
Po ≤ 1W
Voc ≤ 30V
Isc ≤ 100mA

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.
Hazardous Area Specic Guidelines
1. Do not open unit when energized.
2. Do not disconnect equipment unless area is known to be non-hazardous.
FM Installation Notes
SEE DRAWING 71B319
Intrinsically-Safe Entity Barrier Parameters
Denition of Entity Concept: The entity concept allows interconnection of intrinsically
safe apparatus to associated apparatus not specically examined in such combination.
The criteria for interconnection is that the voltage and current which intrinsically-safe
apparatus 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 “nonincendive”
rating gives our customers the ability to choose an intrinsically safe barrier from any
barrier manufacturer meeting the below ratings.
ZERO POT
LOCATION
SPAN POT
The offset or zero adjustment potentiometer is shown in Figure D. A hole is provided
in the ber 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 connec-tion will ensure that both ports are at the same pressure. A
clockwise rotation raises the output.
Figure D: Zero pot location
EARTH
GROUND
Rs
(LOAD) POWER
SUPPLY
V+
V-
EARTH
GROUND
POWER
SUPPLY
V+
V-
SIGNAL
OUT
+
-
Figure E: Current (4-20 mA) output wiring
Figure F: Voltage output wiring

Printed in U.S.A. 10/22 FR# 443350-00 Rev. 3©Copyright 2022 Dwyer Instruments, LLC
DWYER INSTRUMENTS, LLC
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [email protected]