Dwyer Instruments 616D Operating Manual

Series 616D DIN Rail Differential Pressure Transmitter

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Specications - Installation and Operating Instructions

Bulletin P-616D

The SERIES 616D DIN Rail Differential Pressure Transmitter senses the pressure
of air and compatible gases and sends a standard 4 to 20 mA or 0 to 10 VDC output

signal. The 616D housing is specically designed to mount on a 35 mm DIN rail in
a panel. This mounting style allows for several units to be mounted closely together
reducing required space. The span and zero controls are for use when checking
calibration, and are not intended for re-arranging to a signicantly different span.
Versatile circuit design enables operation in 2-wire current loops.

INSTALLATION

1. Location: Select a clean, dry mounting location free from excess vibration where

the temperature will remain between 14 and 185°F (-10 to 85°C). Distance from the
receiver is limited only by total loop resistance. See electrical connections in Figure 1.
The tubing supplying pressure to the instrument can be practically any length required,
but long lengths will increase response time slowly.

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 nal spanning and zeroing
must be done while the transmitter is in that alternative position.

3. Pressure Connections: Two installable barbed tubing connections are provided.
They are dual-sized to t 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.

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SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±0.25 FS @ 77°F (25°C).
Thermal Effect: ±0.02% FS/°F (±0.036% FS/°C).
Stability: ±1% FS/yr.
Temperature Limits: 14 to 185°F (-10 to 85°C).
Pressure Limits: See chart.
Power Requirements: 10 to 35 VDC (2-wire), 17 to 36 VDC, or isolated 21.6 to 33

VAC (3-wire).

Output Signal: 4 to 20 mA (2-wire) or 0 to 10 VDC (3-wire).
Zero and Span Adjustments: Push buttons.
Loop Resistance: Current output: 0 to 1250 Ω (max); Voltage output: Load

resistance 1 kΩ (min).

Current Consumption: 40 mA max.
Electrical Connections: Screw-type terminal block.
Process Connections: 1/8˝ female NPT. Accessories included are 2 barbed ttings

for 1/8˝ and 3/16˝ (3.12 and 4.76 mm) I.D. rubber and vinyl tubing.

Mounting Orientation: Vertical, on a 1.378 (35 mm) DIN rail.
Weight: 4.8 oz (136 g).
Agency Approvals: CE.

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Series 616D Transmitter Models & Ranges

MODEL CHART
Model Range Max. Pressure
616D-2

616D-3
616D-4
616D-5
616D-6
616D-7
616D-8

0 to 6 in w.c.
0 to 10 in w.c.
0 to 20 in w.c.
0 to 40 in w.c.
0 to 100 in w.c.
0 to 200 in w.c.

0 to 10 psid

Table 1

10 psig
10 psig
20 psig
20 psig

15 psig
45 psig
45 psig

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: [phone]

Fax: [phone]

www.dwyer-inst.com

e-mail: [e-mail]

ELECTRICAL CONNECTIONS

CONNECTIONS

CURRENT OUTPUT WIRING

CAUTION

designed for 120 or 240 VAC line operation.

Electrical Connections are made to the terminal block located in front of the transmitter.
Terminals are marked PWR, COM, and VOUT. (See Figure 1 below)

Do not exceed specied supply voltage ratings. Permanent
damage not covered by warranty will result. This unit is not

The range of appropriate receiver load resistances (RL) for power supply voltage
available is given by the formula listed below. Shielded 2-wire cable is recommended
for control loop wiring. Ground the shield at the power supply end.

NOTICE

of the transmitter or receiver be inadvertently reversed, the loop will not function
properly, but no damage will be done to the transmitter.

The receiver may be connected to either the negative or positive
side of the loop, whichever is most convenient. Should the polarity

VPS - 10.0

RL =

20 mA DC

SPAN AND

ZERO ADJUST

ELECTRICAL

Electrical Connection:

The Series 616D simultaneously transmits a 2-wire 4 to 20 mA current output and a
3-wire 0 to 10 V voltage output via a screw-type terminal block. The transmitter can
be wired in one of the following three ways to utilize the current and/or voltage output.

Power Supply

Refer to Table 2 for the required supply rating.

MODEL CHART
Output Type Power Supply Rating

2-wire current
3-wire voltage
Simultaneous current and voltage

Choose a power supply with a voltage and current rating sufcient to meet the power
specications under all operating conditions. If the supply is unregulated, make sure
that the output voltage remains within the required voltage range under all power line
conditions. Ripple on the supply should not exceed 100 mV.

2-Wire 4 to 20 mA Current Operation

CAUTION

are not designed for AC voltage operation.

The connections to the transmitter are made through terminals PWR and COM on the

terminal block as shown in Figure 2.

Figure 1: Electrical Connections

10 to 35 VDC (40 mA min)
17 to 36 VDC or 21.6 to 33 VAC (40 mA min)
17 to 35 VDC (40 mA min)

Table 2

Do not exceed specied supply voltage ratings. Permanent
damage not covered by warranty will result. Simultaneous outputs

The maximum length of connecting wire between the transmitter and the receiver is
a function of wire size and receiver resistance. That portion of the total current loop
resistance represented by the resistance of the connecting wires themselves should
not exceed 10% of the receiver resistance. For extremely long runs (over 1,000
ft/305 m), it is desirable to select receivers with lower resistances in order to keep the
size and cost of the connecting leads as low as possible. In installations where the
connecting run is no more than 100 ft (30.5 m), connecting lead wire as small as No.

22 ga. can be used.

3-Wire 0 to 10 V Voltage Operation

CAUTION

The connections to the transmitter are made to Terminals PWR, COM, and VOUT on

the terminal block as shown in Figure 3.

The minimum receiver load is 1 kΩ. The resistance due to the wire should be low
compared to the receiver load resistance. While the voltage at the terminal block
remains unchanged with a 10 mA current ow, resistive losses in the wiring do cause
errors in the voltage delivered to the receiver. For a 1% accuracy gauge, the resistance
of the wires should be less than 0.1% of the value of the receiver load resistance. This
will keep the error caused by the current ow below 0.1%.

Do not exceed specied supply voltage ratings. Permanent
damage not covered by warranty will result.

POWER

SUPPLY

VOLTAGE OUTPUT WIRING

Figure 3: Voltage Output Wiring

VOLTAGE

RECEIVER

CURRENT
RECEIVER

POWER

SUPPLY

Figure 2: Current Output Wiring

Simultaneous Current and Voltage Operation

INDICATED PRESSURE

PRESSURE

-F

CAUTION

are not designed for AC voltage operation.

The connections to the transmitter are made to Terminals PWR, COM, and VOUT

on the terminal block as shown in Figure 4. The voltage output and the power supply
must have separate wire leads that are only joined at terminal COM of the transmitter.
Additional error may occur for the voltage output if a single wire is used or if the wires
are joined at the power supply or receiver.

Do not exceed specied supply voltage ratings. Permanent
damage not covered by warranty will result. Simultaneous outputs

NOTE: POWER AND VOLTAGE
CURRENT
RECEIVER

POWER

SUPPLY

SIMULTANEOUS CURRENT AND

VOLTAGE OUTPUT WIRING

RECEIVER "-" MUST BE

SEPARATE WIRES CONNECTED AT

THE MODEL 616D COM

TERMINAL

VOLTAGE

RECEIVER

MULTIPLE RECEIVER INSTALLATION

An advantage of the standard 4 to 20 mA DC output signal produced by the Series
616D Transmitter is that any number of receivers can be connected in series in the
current loop, given max loop total resistance is not violated. Thus an analog panel
meter, a chart recorder, process controlling equipment, or any combination of
these devices can be operated simultaneously. The only requirement is that each
component be equipped for a standard 4 to 20 mA input and the proper polarity of the
input connections be observed when inserting the device in the current loop. If any of
the units display a negative or downscale reading, the signal input leads are reversed.

ZERO DEADBAND

+F.S.

.S.

-D.B.
%F.S.

-F.S.

+D.B.
%F.S.

INPUT

+F.S.

Figure 4: Simultaneous Current and Voltage Output Wiring

For the current output, the maximum allowable loop resistance (wiring + receiver
resistance) is dependent on the power supply. The maximum loop voltage drop must
not reduce the transmitter voltage below 17 V. The maximum loop resistance can be
calculated using the following equation:

VPS - 17.0

RMAX =

(where VPS is the power supply voltage)

The equation uses 17.0 instead of 10.0 used in the current only equation. This
represents the minimum voltage supply which is higher on the simultaneous output
conguration due to the requirements of the voltage outputs.

Shielded 4-wire cable is recommended for control loop wiring. Ground the shield
at the power supply end only. Should the polarity of the transmitter or receiver be
inadvertently reversed, the unit will not function properly, but no damage will be done

to the transmitter.

For voltage outputs, the minimum receiver load is 1 kΩ. The resistance due to the
wire should be low compared to the receiver load resistance. While the voltage at
the terminal block remains unchanged with a 10 mA current ow, resistive losses in
the wiring do cause errors in the voltage delivered to the receiver. For a 1% accuracy
gauge, the resistance of the wires should be less than 0.1% of the value of the receiver
load resistance. This will keep the error caused by the current ow below 0.1%.

CALIBRATION

NOTICE

takes place. This delay is used to prevent stress related offsets on the lower range.

There is a 5 second delay from the time the zero or span calibration

button is released until the time that the change in the calibration

20 mA DC

Figure 4

MAINTENANCE/REPAIR

Upon nal installation of the Series 616D DIN Rail Differential Pressure Transmitter,
no routine maintenance is required. The Series 616D is not eld 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 Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any

additional application notes.

Zero Calibration

The zero calibration can be set by applying zero pressure to both the pressure ports
and pressing the zero button for 3 seconds.

Span Calibration

The span calibration can be adjusted only after setting the zero adjustment. It must be
completed within 5 minutes of the last zero calibration. The span calibration button will
be ignored until the zero calibration is completed. Apply pressure to the ports of the
transmitter that are associated with the maximum output of the transmitter (20 mA, 5
V, or 10 V, depending on the output being used). Press and hold the span button for
3 seconds.

©Copyright 2016 Dwyer Instruments, Inc. Printed in U.S.A. 1/16 FR# 443269-10 Rev. 2

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: [phone]

Fax: [phone]

www.dwyer-inst.com

e-mail: [e-mail]