Dwyer 616C User Manual

Bulletin E-43

Series 616 Differential Pressure Transmitter

Specifications – Installation and Operating Instructions

5/16

[7.950]

3-21/64

[84.53]

2-13/32
[61.12]

The Series 616 Differential Pressure Transmitter senses the pressure
of air and compatible gases and sends a standard 4-20 mA output
signal. A wide range of models are available factory calibrated to specific
ranges as listed in the chart below. The span and zero controls are for
use when checking calibration. They are not intended for re-ranging to a
significantly different span. Versatile circuit design enables operation in
2, 3 or 4-wire current loops.

For applications requiring direct pressure readings or percent of full span
output, the optional Model A-701 Digital Readout makes an ideal
companion device. It provides a bright red 0.6˝ high, 3-1/2 digit LED
display while supplying power to the Series 616 transmitter. For
additional information on these and other transmitters, see the Dwyer
Instruments, Inc. Full Line catalog.

ø5/32 [3.97]

MOUNTING HOLE

TYP 2 PLACES

SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: 616: ±0.25% F.S.; 616C: ±1.0% F.S.
Stability: ± 1% F.S./yr.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Pressure Limits: See Chart.
Thermal Effect: 616: ±0.055% F.S./°F (0.099% F.S./°C); 616C:

±0.070% F.S./°F (0.125% F.S./°C).

Power Requirements: 10-35 VDC (2, 3 or 4 wire); 16-26 VAC (4 wire).
Output Signal: 4 to 20 mA.
Zero and Span Adjustments: Potentiometers for zero and span.
Loop Resistance: DC: 0-1250 ohms maximum; AC: 0-1200 ohms

maximum.

Current Consumption: DC: 38 mA maximum; AC: 76 mA maximum.
Electrical Connections: Screw-type terminal block.
Process Connections: Barbed, dual size to fit 1/8˝ and 3/16˝

(3.12 mm and 4.76 mm) I.D. rubber or vinyl tubing.
Mounting Orientation: Vertical, consult factory for other position
orientations.
Weight: 1.8 oz. (51 grams).

HI LO

1/2

[12.70]

1-1/2

[38.10]

2-1/4

[57.15]

1/2

[12.70]

7/8

[22.23]

Series 616 Transmitter Models and Ranges*

Model Range Max. Press. Model Range Max. Press.
616-00 0-1 in. w.c. 2 psig 616-8 0-10 psid 29 psig
616-0 0-2 in. w.c. 2 psig 616-9 0-20 psid 58 psig
616-1 0-3 in. w.c. 2 psig 616-10 0-30 psid 58 psig
616-2 0-6 in. w.c. 5 psig 616-11 0-50 psid 150 psig
616-3 0-10 in. w.c. 5 psig 616-12 0-100 psid 150 psig
616-4 0-20 in. w.c. 11 psig 616-3B 1.5-0-1.5 in. w.c. 2 psig
616-5 0-40 in. w.c. 11 psig 616-6B 3-0-3 in. w.c. 5 psig
616-6 0-100 in. w.c. 29 psig 616-10B 5-0-5 in. w.c. 5 psig
616-7 0-200 in. w.c. 29 psig 616-20B 10-0-10 in. w.c. 11 psig

*All models available with 0.25% F.S. Accuracy.

Models available with 1.0% F.S. Accuracy include 616-1 through 616-20B.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Installation

POWER
SUPPLY

10-35 VDC

PRESSURE

TRANSMITTER

Jumper
Wire

Receiver

1.0 Location

Select a clean, dry mounting location free from excess vibration where
the temperature will remain between 20 and 120˚F (-6.7 and 48.9˚C).
Distance from the receiver is limited only by total loop resistance. See
Electrical Connections below. The tubing supplying pressure to the
instrument can be practically any length required, but long lengths will
increase response time slightly.

2. Position

A vertical position, with pressure connections pointing down, is
recommended. That is the position in which all standard models are
spanned and zeroed at the factory. They can be used at other angles, but
final spanning and zeroing must be done while transmitter is in that
alternate position.

Pressure Connections

Two integral barbed tubing connections are provided. They are dual­sized to fit both 1/8˝ and 3/16˝ (3.12 and 4.76 mm) I.D. tubing. Be sure
the pressure rating of the tubing exceeds that of the operating ranges.
On ranges over 20 psi, we recommend use of a suitable hose clamp to
assure the integrity of the connection.

Electrical Connections

CAUTION: Do not exceed specified supply voltage ratings.
Permanent damage not covered by warranty will result. This unit is
not designed for 120 or 240 volts AC line operation.

Electrical connections are made to the terminal block located on the top
of the transmitter. Terminals are marked 1, 2, 3 and 4 (see Fig. B below).
Determine which of the following circuit drawings applies to your
application and wire accordingly.

2-Wire Operation

An external power supply delivering 10-35 VDC with minimum current
capability of 40 mA DC (per transmitter) must be used to power the
control loop. See Fig. C for connection of the power supply, transmitter
and receiver. Note the jumper between terminals 3 and 4. The range of
appropriate receiver load resistance (RL) for the DC power supply voltage
available is expressed by the formula and graph in Fig. F. Shielded two
wire cable is recommended for control loop wiring. If grounding is
required, use the negative side of the control loop after the receiver.
Otherwise, in 2-wire operation it is not necessary to observe polarity of
control loop connections.

2-Wire Connections

Figure C

3-Wire Operation

An external power supply delivering 10-35 VDC with minimum current
capability of 40 mA DC (per transmitter) is required. See Fig. D for
connection of power supply, transmitter and receiver. The range of
appropriate receiver load resistance (RL) for the DC power supply
available is expressed by the formula and graph in Fig. F. Shielded cable
is recommended for control loop wiring. Do not employ a separate
ground in 3-wire operation. Unit will not function properly and/or damage
could result. Control loop polarity must be observed in the following
respect. Although power supply terminals 1 and 2 are not polarized, the
receiver must be connected between terminal 3 of transmitter and
negative side of power supply.

SPAN AND

ZERO ADJUST

1 2 3 4

HI LO

Figure B

Wire Length

The maximum length of wire connecting transmitter and receiver is a
function of wire size and receiver resistance. Wiring should not contribute
more than 10% of the receiver resistance to total loop resistance. For
extremely long runs (over 1000 feet), choose receivers with higher
resistance to minimize size and cost of connecting leads. Where wiring
length is under 100 feet, hook-up wire as small as 22 AWG can be used.

3-Wire Connections

PRESSURE

TRANSMITTER

Receiver

mA

POWER
SUPPLY

10-35 VDC

Figure D

4-Wire Operation

An external power supply delivering 10-35 VDC with a minimum current
capability of 40 mA DC (per transmitter) or 16-26 VAC with a minimum
current capability 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 (RL) for the DC or AC power supply available
is expressed by the formulas and graphs in Fig’s. 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 damage
could result. Control loop polarity must be observed; terminal 3 is
negative and terminal 4 is positive.