The
Series 634ES Pressure Transmitter
senses a single
air, compatible gas or liquid pressure and converts it into
a standard 4-20 mA output signal. Ranges are available
from 0-10 through 0-6000 psi. All models are field
adjustable so any range within these limits can be
achieved by recalibration using the easily accessible
span and zero potentiometers.
Positive pressure can be measured within an accuracy of
±0.5% of span. The Series 634ES uses an isolated
piezoresistive pressure sensor to produce a resistance
change across a wheatstone bridge. The signal is condi-
tioned and converted into a 4-20 mA output signal.
For applications requiring direct pressure or percent of
full span readings, the optional A-701 digital readout
makes an ideal companion device, providing a bright .6”
high, 3-1/2˝ digit LED and supplying power to the Series
634ES Transmitter.
PHYSICAL DATA
GENERAL
Maximum Pressure:
See chart on this page.
Wetted Parts:
316, 316L Stainless Steel.
Housing:
Designed to meet NEMA-4X.
ELECTRICAL
Power Supply:
12.3-35 VDC-2 wire.
Output Signal:
4-20 mA DC (limited at 38 mA DC).
Loop Resistance:
0 - 1100 ohms from 12.3 to 35 VDC.
R
L max
=
Current Consumption:
DC: 38 mA max.
MATERIALS
Housing:
Cast aluminum; textured gray polyurethane
finish.
Pressure Connection:
Stainless Steel.
MECHANICAL
Weight:
1 lb., 12 oz. (.8 kg).
Span and Zero Adjustments:
Protected potentiome-
ters, located in auxiliary housing.
Pressure Connection:
1/4˝ female NPT x 1/2˝ male
NPT.
PERFORMANCE AT 70°F (21.1°C)
Zero Output:
4 mA DC.
Full Span:
16 mA DC.
Accuracy:
±0.5% of span.
Warm-up Time:
10 minutes.
STABILITY/ENVIRONMENTAL
Operating Temperature:
20 to 120˚F (- 6.7 to 48.9˚C).
Thermal Errors:
± 0.02%/˚F typical.
Stability:
1% F.S./yr.
STANDARD ACCESSORIES
(3) “Z” mounting brackets.
(3) 10-32 x 4” RH machine screws.
Series 634ES Pressure Transmitter
Specifications - Installation and Operating Instructions
Bulletin E-69ES
Vps-12.3V
20 mA
Series 634ES Models and Ranges in PSI (bar)
634ES-0
634ES-1
634ES-2
634ES-3
634ES-4
634ES-5
634ES-6
634ES-7
634ES-8
634ES-9
10 (.69)
30 (2.07)
50 (3.45)
100 (6.9)
200 (13.8)
300 (20.7)
500 (34.5)
1000 (69)
2000 (138)
4000 (276)
10 (.69)
20 (1.38)
40 (2.76)
60 (4.14)
100 (6.9)
250 (17.2)
350 (24.1)
600 (41.4)
1250 (86)
2500 (172)
20 (1.38)
40 (2.76)
60 (4.14)
120 (8.3)
250 (17.2)
350 (24.1)
600 (41.4)
1250 (86)
2500 (172)
6000 (414)
30 (2.07)
60 (4.14)
100 (6.9)
200 (13.8)
400 (27.6)
500 (34.5)
1000 (69)
2000 (138)
4000 (276)
7500 (517)
Model Number
As Stocked Min. Range
Max. Range
Max Pressure
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Fax: 219/872-9057
e-mail: info@dwyer-inst.com
Lit-By Fax: 888/891-4963
2-1/2 [63.50]
TYP
1-11/16
[42.86]
5-5/16
[134.94]
1/4NPT
1/2NPT
2-7/8 [73.03]
1/16 [1.59]
25/32 [19.84]
03-3/8 [85.73]
3/4 NPT
1-9/16
[39.69]
(3) #10-32 x 1/4 [6.35] DP HOLES
EQUALLY SPACED ON A 2-1/2 [63.50] B.C.
E-69ES (634ES)-4.0 6/26/02 11:05 AM Page 1
