Dwyer Instruments 631 Series Installation And Operating Instructions

Series 631 Differential Pressure Transmitter
Specifications - Installation and Operating Instructions
The Series 631 Differential Pressure Transmitter monitors differential pressure
of air and compatible gases and liquids. The design employs converting pressure
changes into a standard 4-20 mA output signal for two wire circuits. Digital push-button,
zero and span adjustments are easily accessed on the front cover. The Series 631
Differential Pressure Transmitter is designed to meet NEMA-4X (IP66) construction.
INSTALLATION
1. Location: Select a location where the temperature of the unit will be between 20 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
practically any length required, but long lengths will increase the response time
slightly. Mount the instrument in a location that will not be subject to excessive
temperature, shock or vibration.
2. Position: A vertical position is recommended (pressure connections pointing
vertically) since that is how all standard models were originally spanned and
zeroed at the factory.
3. Pressure Connection: Dual 1/4˝ female NPT pressure connections are provided.
Use pipe thread sealant tape or other suitable pipe joint compound when making
connection to the pressure source. Avoid excess sealant which could block the
pressure passage. When monitoring liquid pressures, air trapped in the lines can
cause incorrect readings. Bleed fittings or similar mechanisms should be used to
bleed off any trapped air.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
3/4 [19.05] TYP
1/4 FEMALE NPT HIGH
PRESSURE CONNECTION
(AIR OR GAS)
(4) #6-32 X 3/8 [9.53] DP
HOLE ON A 4-11/32 [110.33]
BOLT CIRCLE
1/4 FEMALE NPT HIGH
PRESSURE CONNECTION (LIQUID)
1/4 FEMALE NPT LOW
PRESSURE CONNECTION (LIQUID)
4-45/64
[119.46]
13/32
[10.32] TYP
3-13/32
[86.52]
SPECIFICATIONS
Service: Compatible gases & liquids.
Wetted Materials: Brass, silicone, 300 SS.
Accuracy: Transmitter Output: ±2% F.S. (includes linearity, hysteresis and
repeatability); Gage: ±3% of full scale at 70°F (21.1°C).
Stability: ±1% F.S./yr.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Pressure Limits: -20˝ Hg to 500 psig. (-0.677 bar to 34.4 bar).
Thermal Effect: Greater than 1˝ ranges: ±0.025%/°F (±0.045%/°C); 1˝ range:
±0.045%/°F (±0.081%/°C); 0.5˝ range: ±0.09%/°F (±0.162%/°C).
Power Requirements: 10-35 VDC.
Output Signal: 4 to 20 mA.
Response Time: 50 msec.
Loop Resistance: 0-1250 ohms maximum.
Electrical Connections: M-12 circular 4 pin connector.
Process Connections: 1/4˝ female NPT high and low pressure taps, duplicated -
one pair top for air and gas, and one pair bottom for liquids.
Enclosure Rating: Designed to meet NEMA 4X (IP66).
Mounting Orientation: Diaphragm in vertical position. Consult factory for other
position orientations.
Weight: 8 lb, 4 oz (3.74 kg).
Agency Approvals: CE.
Phone: 219/879-8000
Fax: 219/872-9057
Bulletin E-114
1/4 FEMALE NPT LOW
PRESSURE CONNECTION
(AIR OR GAS)
35° TYP
5
[127.00]
3/16
[4.76]
www.dwyer-inst.com
e-mail: info@dwyermail.com