Dwyer Instruments 604D-0, Specifications-Installation And Operating Instructions

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4-Wire Operation - An external power supply delivering
10-35 VDC with minimum current capability of 40 mA DC
(per transmitter) or 16-26 VAC with minimum current capa-
bility of 80 mA AC (per transmitter) is required. See Fig. E for
connection of power supply, transmitter and receiver. The
range of appropriate load resistance (R
L
) for the DC or AC
power supply available is expressed by the formulas and
graphs in Figs. F and G. Shielded cable is recommended for
control loop wiring. Do not employ a separate ground in 4
wire operation. Unit will not function properly and /or dam-
age could result. Control loop polarity must be observed,
terminal 3 is negative and terminal 4 is positive. Power sup-
ply terminals 1 and 2 are not polarized.
Series 604D Indicating Pressure Transmitter
Specifications - Installation and Operating Instructions
Bulletin E-34
Page 3
Voltage Input - Series 604D Indicating Pressure
Transmitters can be easily adapted for receivers requiring
1-5 VDC or 2-10 VDC input. Insert a 249 OHM,
1 /
2
watt
(1-5 VDC) or 499 ohm (2-10 VDC) resistor in series with the
current loop but in parallel with the receiver input. Locate
this resistor as close as possible to the input. Because
resistor accuracy directly influences output signal accuracy,
we recommend use of a precision ±0.1% tolerance resistor
to minimize this effect. See Figs. H and J.
SERIES 604D
PRESSURE
TRANSMITTER
POWER
SUPPLY
10-35 VDC
16-26 VAC
MAXIMUM VALUE (1300
Ω
)
RL MAX. = Vps-10.0
20 mA DC
OPERATING
REGION
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
50
T
O
T
AL RECEIVER RESIST
ANCE (
Ω
)
0 5
10 13 15 20 25 30 35 40
VDC
SERIES 604D
PRESSURE
TRANSMITTER
POWER
SUPPLY
10-35 VDC
SERIES 604D
PRESSURE
TRANSMITTER
POWER
SUPPLY
10-35 VDC
16-26 VAC
4 WIRE CONNECTION
POWER SUPPLY VOLTAGE-VDC (2, 3, OR 4 wire)
POWER SUPPLY VOLTAGE-VAC (4 wire)
3-WIRE CONNECTION (1-5/2-10 VDC OUTPUT)
4-WIRE CONNECTION (1-5/2-10 VDC OUTPUT)
Fig. E
Fig. F
Fig. H
Fig. J
MAXIMUM VALUE (1200
Ω
)
RECEIVER RESIST
ANCE (
Ω
)
OPERATING
REGION
1400
1200
1100
1000
900
800
700
600
0 5
10
15
16
20 25
26
30
R MAX=65(Vps)-560
L
Fig. G