Dwyer Instruments DM-2000 Manual de usuario

DWYER INS RUMEN S, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CI Y, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: lit@dwyer-inst.com

The Dwyer Series DM-2000 Differential Pressure Transmitter senses

the pressure of air and compatible gases and sends a standard 4-20 mA

output signal. The DM-2000 housing is specifically designed to mount in

the same diameter cutout as a standard Magnehelic® differential gage. A

wide range of models are available factory calibrated to specific ranges.

ressure connections are inherent to the glass filled plastic molded

housing making installation quick and easy. Digital push-button zero

simplifies calibration over typical turn-potentiometers. Single push button

allows field selection of 5 engineering units (LCD models only). An

optional 3.5 digit LCD shows process and engineering.

A essories

Mounting Lugs

6-20 x 2˝ Screws - 3

6-19 x 1/2˝ Screws - 3

INSTALLATION

1. Lo ation

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 on next page. 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 required. That is the position in which all standard

models are spanned and zeroed at the factory.

Pressure Conne tions

Two integral tubing connections are provided on the side of the gage.

They are sized to fit 1/8˝ (3.12 mm) I.D. tubing. Be sure the pressure

rating of the tubing exceeds that of the operating ranges.

Note: The tubing connections on the back of the gage are not to be used

as process connections.

3. Mounting

anel - rovide a 4-9/16˝ diameter opening in panel. Insert gage and

secure in place with provided screws and adapters.

Surface - rovide three 3/16˝ diameter holes in panel on a 4-1/8˝

diameter bolt circle. Cut opening for terminal block as shown in diagram

to right.

Series DM-2000 Differential Pressure Transmitter

Bulletin E-43-DM

Spe ifi ations – Installation and Operating Instru tions

HIGH PRESSURE PORT

1-1/4

[31.75]

7/16

[11.11]

17/32

[13.50]

1-11/16

[42.86]

5/32

[3.97]

ø4-3/4

[120.65]

LOW PRESSURE PORT

SPECIFICATIONS

Servi e: Air and non-combustible, compatible gases.

Wetted Materials: Consult Factory.

A ura y: ±1% F.S. at 70°F.

Stability: ±1% F.S./yr.

Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).

Pressure Limits: 10 psig (0.69 bar).

Thermal Effe t: ±0.055% F.S./°F (0.099% F.S./°C).

Power Requirements: 10-35 VDC (2 wire).

Output Signal: 4 to 20 mA.

Zero and Span Adjustments: Digital push-button zero and span.

Loop Resistan e: DC: 0-1250 ohms maximum.

Current Consumption: DC: 38 mA maximum.

Ele tri al Conne tions: Screw-type terminal block.

Pro ess Conne tions: 1/8˝ I.D. tubing.

Mounting Orientation: Vertical.

Weight: 4.8 oz (136 g).

Agen y Approvals: CE.

(25.40)

11/16

(17.46)

65.000°

(3) HOLES FOR #6 SCREW

EQUALLY SPACED ON

4-1/8 (104.78) B.C.

1-1/2

(38.10)

Panel

Surfa e

www. .com information@itm.com1.800.561.8187

ELECTRICAL CONNECTIONS

CAUTION: Do not ex eed spe ified supply voltage ratings.

Permanent damage not overed 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 in back of

the transmitter. Terminals are marked + and - (see Fig. B below).

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.

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. The range of appropriate receiver load resistance (RL) for

the DC power supply voltage available is expressed by the formula and

graph in Fig. D. 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.

2-Wire Conne tions

Figure C

Power Supply Voltage – VDC (2-wire)

Figure D

USER CALIBRATION

The transmitter may be user calibrated with two buttons on the front. The

standard models have buttons labeled “ZERO” and “S AN”. LCD models

have buttons labeled “ZERO” and “UNITS”. The “UNITS” button on the

LCD models has 2 functions. If pushed for less than 2 seconds and

released the pressure units that are displayed on the LCD will change

when the button is released. If pushed and held for 4 - 5 seconds the

“UNITS” button serves the same function as the “S AN” button on the

standard models.

To calibrate the transmitter you will need three pieces of equipment. You

will need a calibrated pressure source capable of generating a stable

pressure value for the maximum range of the unit under test, an

instrument capable of validating the calibration pressure, and a

milliameter to measure the current output from the unit under test. The

transmitter is calibrated using the following procedure.

Preparation – Connect the Milliameter and power supply, being careful

to observe polarities. The transmitter must be calibrated in a vertical

position.

Calibrating Zero – Leaving the pressure connections vented, press and

hold the “ZERO” button for 4 – 5 seconds. The zero point will now be set

and the gage output will be 4 mA and if it is an LCD model the display

will read zero. This zero calibration is done first as it can affect the span

value.

Calibrating Span – Connect the pressure source and apply the high

range rated pressure. When the pressure has stabilized, press and hold

the “UNITS” button (for LCD models), or the “S AN” button (on standard

models), for 4 – 5 seconds. The span point will now be set and the gage

output at full range will be 20 mA and if it is an LCD model will now read

the full range calibration pressure. The zero and span setting are slightly

interactive so recheck the zero calibration and repeat both zero and span

calibration if necessary.

Restoring Fa tory Calibration Coeffi ients:

The user calibration coefficients are stored in non volatile memory, which

retains its content indefinitely without external power or batteries.

Factory calibration can be easily restored if the user calibration must be

“erased”. To do this simultaneously press both buttons on the front and

hold them for 4 – 5 seconds. The factory calibration will now be restored.

MAINTENANCE

Upon final installation of the Series DM2000 Differential ressure

Transmitter and the companion receiver no routine maintenance is

required. A periodic check of the system calibration is recommended

following the procedures explained under Calibration Check. The Series

DM2000 Transmitter is not field serviceable and should be returned,

freight prepaid, to the factory if repair is required. lease enclose a

description of the problems encountered plus any available application

information.

RECEIVER

SERIES

DM-2000

PRESSURE

TRANSMITTER

2POWER

SUPPLY

10-35 VDC

1500

1400

1300

1200

1100

1000

900

800

700

600

500

400

300

200

100

Total Receiver Resistance (Ω)

Maximum Value (1250 Ω)

R Max. =

0 5 10 13 15 20 25 30 35 40

Vps–10.0

20mA DC

Operating

Region

©Copyrigh 2013 Dwyer Ins rumen s, Inc. Prin ed in U.S.A. 12/13 FR# 01-443402-00 Rev. 3

DWYER INS RUMEN S, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CI Y, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

www. .com information@itm.com1.800.561.8187

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