Dwyer Instruments 605 User manual

The Dwyer
Series 605 Magnehelic®Indicating Transmitter simulta-
neously provides local indication on a large, easily read ana-
log scale while also converting that pressure into a standard
two-wire, 4-20 mA signal for ranges from 0-0.5 to 0-50˝
w.c. Positive, negative or differential air and compatible gas
pressure can be measured with an accuracy of ±2% of full
scale. The basic mechanical components of the Series 605
Magnehelic®indicating transmitter are similar to those used
in the popular, time-proven Magnehelic®differential pres-
sure gage. However, the Series 605 models add electrical
conditioning and amplification of a resistance change pro-
duced by a silicon strain gage which is cemented to the
range spring. This resistance change is the result of the
slight flexing which results from spring deflection as pres-
sure is applied to the diaphragm which is directly linked to
the spring.
Series 605 Magnehelic® Differential Pressure Indicating Transmitter
Specifications - Installation and Operating Instructions
Bulletin E-68
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: [phone] e-mail: [e-mail]
23/32
[18.26]
1
[25.40]
30°
1-1/8
[28.58]
(3) #6-32 x 3/16 [4.76]
DP HOLES EQUALLY SPACED
ON A Ø4-1/8 [104.78] B.C.
FOR PANEL MOUNTING
11/16
[17.46]
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
1/2 [12.70]
1-3/4
[44.45]
1/8 FEMALE
NPT HIGH
PRESSURE
CONNECTION
2-1/16
[52.39]
2
[50.80]
1-1/4
[31.75]
2-1/2
[63.50] 3/16
[4.76]
5/8 [15.88]
PANEL MAX
Ø5
[127.00]
Ø4-47/64
[ 120.25]
(4) 6-32 HOLES
EQUALLY SPACED ON
A 5-1/8 [130.18] B.C.
FOR FLUSH MOUNTING
Ø4 [101.60]
FACE
5-1/2 [139.70]
O.D. MOUNTING
RING
SPECIFICATIONS
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: See chart.
Stability: +1% F.S./yr.
Pressure Limits: See chart.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Process Connections: 1/8˝ female NPT.
Size: 4˝ (101.6 mm) dial face, 5˝ (127 mm) O.D. x 2-11/16˝
(68.3 mm).
Weight: 1 lb, 12.6 oz (811 g).
Agency Approvals: CE.
TRANSMITTER SPECIFICATIONS
Accuracy: See chart (includes linearity, hysteresis,
repeatability).
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Compensated Temperature Range: 32 to 120°F (0 to
48.9°C).
Thermal Effect: ±0.025% F.S./°F (0.045% F.S./°C).
Power Requirements: 10-35 VDC (2-wire).
Output Signal: 4 to 20 mA.
Zero and Span Adjustments: Protected potentiometers.
Loop Resistance: DC; 0-1250 ohms maximum.
Current Consumption: DC; 38 mA maximum.
Electrical Connections: Screw terminal block.
Mounting Orientation: Diaphragm in vertical position.
Consult factory for other position orientations.
Model
Number
605-00N
605-11
605-0
605-1
605-2
605-3
605-6
605-10
Range
in w.c. Model Number Range in w.c.
.05-0-.20
.25-0-.25
0-.50
0-1.0
0-2.0
0-3.0
0-6.0
0-10
605-20
605-30
605-50
605-60Pa
605-125Pa
605-250Pa
605-500Pa
0-20.0
0-30
0-50
Range in Pa
0-60
0-125
0-250
0-500
Maximum
Pressure
25 psi (1.7 bar)
25 psi (1.7 bar)
25 psi (1.7 bar)
25 psi (1.7 bar)
5 psi (34.5 kPa)
5 psi (34.5 kPa)
5 psi (34.5 kPa)
5 psi (34.5 kPa)
Electrical
Accuracy +/-%
2
2
2
2
0.5
0.5
0.5
0.5
Mechanical
Accuracy +/-%
4
3
3
2
2
2
2
2
Maximum
Pressure
20 psi (1.4 bar)
20 psi (1.4 bar)
20 psi (1.4 bar)
25 psi (1.7 bar)
25 psi (1.7 bar)
25 psi (1.7 bar)
5 psi (34.5 kPa)
Electrical
Accuracy +/-%
0.5
0.5
0.5
2
2
2
0.5
Mechanical
Accuracy +/-%
2
2
2
4
3
2
2
Patent No. 4,890,497
STANDARD ACCESSORIES
Mounting ring
Snap ring
(4) 6-32 x 1-1/4 screws (panel mtg.)
(3) 6-32 x 5/16 screws (surface mtg.)
(2) Tubing to 1/8˝ NPT adapters
(2) 1/8˝ NPT plugs
Adjustment key
E-68 8/2/07 8:43 AM Page 1

INSTALLATION
1. LOCATION: Select a location where the temperature of
the unit will be between 20°F and 120°F. Distance from
the receiver is limited only by total loop resistance. See
“Electrical Connections”. The tubing feeding pressure
to the instrument can be run practically any length
required but long lengths will increase response time
slightly. Avoid surfaces with excessive vibration.
2. POSITION: All standard models are calibrated with the
diaphragm vertical and should be used in that position
for maximum accuracy. If your application requires
mounting in other than a vertical position, be sure to
specify this when ordering.
3. PRESSURE CONNECTIONS: For convenience, two
sets of 1/8˝ female NPT ports are available. Plug the
unused set with pipe plugs provided. Attach tubing
from positive pressure source to port marked “HI” or
from negative (Vacuum) source to port marked “LOW”.
In either case, opposite port must be vented to atmos-
phere. In dusty environments, we recommend use of an
A-331 Filter Vent Plug to keep interior of instrument
clean. For differential pressures the higher source is
connected to the “HI” port and lower to the ”LOW” port.
4. MOUNTING: The Series 605 Transmitter may be either
panel mounted or surface mounted.
A. PANEL MOUNTING: Cut a 4-3/4˝ or 120 mm dia.
hole in panel and insert the complete unit from the
front. Slip on the mounting ring and install the split
snap ring in the groove on the bezel. Seat the mount-
ing ring against the snap ring and thread the four
screws through the tapped holes. Tighten screws
against rear of panel.
B. SURFACE MOUNTING: Drill (3) 3/16˝ dia. holes for
mounting screws and cut (1) 7/8˝ x 1-1/8˝ hole for
access to terminal strip as shown in hole location
drawing. Insert screws from rear of panel and thread
into tapped holes on back of transmitter case. If rear
pressure connections are to be used, make 1/2˝ dia.
holes located as shown in hole location drawing in left
column.
5. ZEROING: Once gage/transmitter is mounted in its
final position, check to be sure pointer aligns with zero
on scale, when no pressure is applied and both low and
high pressure ports are vented to atmosphere. To
adjust, turn small slotted screw at center-bottom of
gage face. Do not move the larger black knobs labeled
SPAN and ZERO. These are for use only if a calibration
check shows the 4-20 mA output signal to need adjust-
ment. See page 3 under heading OUTPUT RANGING.
7
17/32
1-7/8 7/8
1-1/8
30°11/16
21/32
1-3/4
SNAP RING GROOVE
PNEUMATIC PRESSURE TAPS
4-3/4 DIA. HOLE
E-68 8/2/07 8:43 AM Page 2

ELECTRICAL CONNECTIONS
CAUTION: DO NOT EXCEED SPECIFIED SUPPLY VOLT-
AGE RATINGS. PERMANENT DAMAGE NOT COVERED
BY WARRANTY WILL RESULT. THIS UNIT IS NOT
DESIGNED FOR AC VOLTAGE OPERATION.
Electrical connections to the Series 605 Transmitter are
made to the two-screw terminal strip on the rear of the
case. Polarity is indicated by + and – signs stamped on
side. The schematic diagram of the Series 605 transmitter
is illustrated in Figure B.
in series with the current loop but in parallel with the receiv-
er input. Referring to Figure B, RLbecomes the 250 ohm
resistor and point X and Y are connected to the receiver
input, point X being positive (+) and point Y negative (–) or
ground. The resistor should be connected at the panel end
of the transmitter current loop close to the receiver input to
take advantage of the immunity of the current loop to elec-
trical noise pickup. Most electronic component distributors
stock a 249 r, 1/2 watt, ±1% tolerance metal film resistor
which is adequate for this application.
An external power supply delivering 10.0 to 35 VDC with a
minimum current capability of 40 milliamps must be used to
power the control loop in which the Series 605 transmitter
is connected. Refer to Fig. B for connection of the power
supply, transmitter and receiver. The range of appropriate
receiver load resistances (RL) for the power supply voltage
available is given by the formula and graph in Fig. C.
Shielded two wire cable is recommended for control loop
wiring and the negative side of the loop may be grounded
if desired. Note also that the receiver may be connected in
either the negative or positive side of the loop, whichever is
most convenient. Should polarity of the transmitter or
receiver be inadvertently reversed, the loop will not function
properly but no damage will be done to the transmitter.
SERIES 605
PRESSURE
TRANSMITTER
POWER
SUPPLY
10.0-35 VDC
RECEIVER (RL)
SEE FIG. C
NOTE: RECEIVER MAY BE IN
SERIES WITH + OR -
LEG OF CONTROL LOOP
The maximum length of connecting wire between the trans-
mitter and the receiver is a function of wire size and receiv-
er resistance. That portion of the total current loop resis-
tance represented by the resistance of the connecting wires
themselves should not exceed 10% of the receiver resis-
tance. For extremely long runs (over 1,000 feet), it is desir-
able to select receivers with higher resistances in order to
keep the size and cost of the connecting leads as low as
possible. In installations where the connecting run is no
more than 100 feet, connecting lead wire as small as No. 22
Ga. can be used.
The Series 605 transmitters can be used with receivers
requiring 1-5 volt input rather than 4-20 mA. If the receiver
requires a 1-5 volt input, insert a 250 ohm, 1/2 watt resistor
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
05101520 25 30 35 40
RECEIVER RESISTANCE RL()
POWER SUPPLY VOLTAGE - VDC
RL MAX = VPS - 10.0V
20 mA DC
MAXIMUM VALUE (1250)
OPERATING
REGION
OUTPUT RANGING
Each Series 605 Magnehelic®indicating transmitter is fac-
tory calibrated to produce 4 mA at zero scale reading and
20 mA at full scale reading. The following procedure should
be used if the pressure versus output signal relationship
needs to be checked.
1. With unit connected to the companion receiver per pre-
ceding instructions, insert an accurate milliammeter
with a full scale reading of approximately 30 mA in
series with the current loop.
2. Vent both pressure ports to atmosphere and, if neces-
sary, adjust pointer zero screw to align pointer with zero
on scale. A controllable pressure source capable of
reaching the full scale range should be connected to
either high pressure port. Plug the other high pressure
port and vent one or both low pressure ports to atmos-
phere. The instrument must be ranged in the same
position in which it will be used. Standard factory cali-
bration and ranging is done with unit vertical.
3. Apply electrical power to the system and check for
proper operation by slowly increasing pressure and
observing whether the loop current increases above
the 4 mA zero pressure reading.
4. A spanner type key is supplied to adjust span and zero.
This helps to reduce unauthorized tampering. Apply
pressure until pointer aligns with full scale reading and
adjust the SPAN knob for a 20 mA reading.
Figure A
Figure B
Figure C
E-68 8/2/07 8:43 AM Page 3

DWYER INSTRUMENTS, INC. Phone: [phone]www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A. Fax: [phone] e-mail: [e-mail]
©Copyright 2007 Dwyer Instruments, Inc. Printed in U.S.A. 8/07 FR# 01-440559-00 Rev. 3
5. Relieve all pressure, allow a few seconds for setting
and adjust the ZERO knob for a 4 mA current loop
reading.
6. The SPAN and ZERO controls are slightly interactive so
steps 4 & 5 should be repeated a few times until read-
ings of 4 and 20 mA are obtained consistently.
7. Remove the milliammeter from the current loop and
proceed with final installation of the transmitter and
receiver.
POWER
SUPPLY
10.0-35
SERIES
605 SERIES
605 SERIES
605 SERIES
605
Several Series 605 transmitters can be operated with a sin-
gle power supply as depicted above in Figure D. Be care-
ful to specify a supply with sufficient capacity. The minimum
current requirement at a given voltage can be calculated by
multiplying the number of units x 20 mA. In the example
shown this would be 4 x 20 or 80 mA minimum.
MAINTENANCE
Upon final installation of the Series 605 Transmitter and the
companion receiver, including the A-701 Digital Readout,
no routine maintenance is required. A periodic check of
system calibration is recommended. The Series 605
Differential Pressure Transmitter is is not field repairable and
should be returned, freight prepaid, to the factory if repair is
needed (field repair should not be attempted and may void
warranty). Be sure to include a brief description of the prob-
lem plus any relevant application notes. Contact customer
service to receive a return goods authorization (RGA) num-
ber before shipping.
Figure D
MULTIPLE UNITS WITH COMMON POWER SUPPLY
E-68 8/2/07 8:43 AM Page 4