Dwyer Instruments 685 Series Installation And Operating Instructions

4-20 mA Output Wiring

2-WIRE
4... 20 mA 2
LOAD
18... 30 VDC
1
4-20 mA
I [mA]
22
21 mA
20
18
16
14
12
10
8
6
3.8 mA
4
2
0
-50 0 50 100 p [%]

Voltage Output Wiring

3-WIRE
3
GND
0... 10 V
2 LOAD
18... 30 VAC 1
0-10 V
U [V]
10.5 V
11
10
9
8
7
6
5
4
3
2
1
0.0 V
0
-50 0 50 100 p [%]
©Copyright 2022 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC
P.O. BOX 373
MICHIGAN CITY, INDIANA 46360, U.S.A.

MAINTENANCE/REPAIR

Upon final installation of the Series 685,
no routine maintenance is required. The
Series 685 is not field serviceable and is
not possible to repair the unit. Field repair
should not be attempted and may void
warranty.

WARRANTY/RETURN

Refer to "Terms and Conditions of Sale" in
our catalog and on our website. Contact
customer service to receive a Return
Materials Authorization (RMA) number
before shipping the product back for repair.
Be sure to include a brief description of the
problem plus any additional application
notes.
Printed in U.S.A. 5/22
FR# 444682-00
Phone: 219-879-8000 Fax: 219-872-9057
dwyer-inst.com
e-mail: info@dwyermail.com
Series 685 Differential Pressure
Transmitter
Specifications - Installation and
Operating Instructions
The Series 685 Differential Pressure
Transmitter is used to measure differential
pressure and vacuum. The adjustable
pressure range and output signal make
it the ideal choice for installers and
maintenance professionals. It has a user-
configurable response time via a jumper
and can be mounted in any orientation.
Applications include building automation
systems, clean room monitoring, valve
and flap control, filter monitoring, and air
flow control. It has an adjustable pressure
range, a single button to zero, and can be
reset to factory settings with a long button
press. No additional reference pressure
sources or separate calibration devices
are necessary.
DWYER INSTRUMENTS, INC
P.O. BOX 373
MICHIGAN CITY, INDIANA 46360, U.S.A.
Bulletin P-685
0.787 [20.0]
0.217 [5.5]
0.374 [9.5]
1.772 0.866
0.394 [10.0]
[45.0] [22.0]
1.614
[41.0]
1.102 [28.0]
0.236 [6.0]
15 MM AF
0.472 [12.0]
1.083
[27.5]
P + P -
0.098
2.598 [66.0]
[2.5]
0.118
[3.0]

BENEFITS/FEATURES

• Cost effective and compact device
suitable for OEM applications where
space, simplicity, and value are key
• Single button to zero saves maintenance
time
• Factory restore to defaults with a long
button press
• User-adjustable response time provides
versatility for many applications

APPLICATIONS

• Building automation, air-conditioning and
clean room technology
• Valve and shutter control
• Filter, ventilator and fan monitoring
• Air-flow control
Phone: 219-879-8000 Fax: 219-872-9057
dwyer-inst.com
e-mail: info@dwyermail.com