Dwyer Instruments 648B Series Bedienungsanleitung

eries 648B Differential Pressure Transmitter

pecifications - Installation and Operating Instructions

Bulletin P-648B

DWYER IN TRUMENT , INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U. .A. Fax: 219/872-9057 e-mail: [email protected]

PECIFICATION

ervice: Air and non-combustible, compatible gases.

Wetted Materials: 302 SS, glass, nickel, silicon rubber, polyethylene, acrylic,

ABS and brass.

Accuracy: ±0.8% FS* at room temperature.

*RSS (Root Sum Square) includes non-linearity, hysteresis and non-

repeatability.

tability: ±1% FS/yr.

Temperature Limits:

Operating: 0 to 170°F (-18 to 77°C);

Storage: -65 to 185°F (-54 to 85°C).

Pressure Limits:

15 psi (100 kPa) proof pressure;

30 psi (200 kPa) burst pressure.

Thermal Effects: ±0.025% FS/°F (0.045%/°C).

Power Requirements: 13 to 32 VDC.

Output ignal: 4 to 20 mA.

Zero and pan Adjustments: Push-button for zero, potentiometer for span.

Response Time: Approximately 10 ms.

Max. Loop Resistance: DC: 0 to 950 Ω.

Electrical Connection: Detachable euro-style terminal block.

Process Connections: 3/16˝ OD barbed fitting for 1/8˝ ID push-on tubing.

Housing: SS and PC+ABS alloy.

Weight: 3.8 oz (108 g).

1-57/64

[48.00]

TERMINAL

BLOCK

1-9/16

[39.50]

3-15/32

[88.00]

[25.40]

BRASS

HOLE

BARBS

3-5/32

[80.00]

Ø3/16

[Ø4.80] 3/16

[4.80]

LED

The eries 648B Differential Pressure Transmitter is designed to be used with

clean, dry air and other non-corrosive gases. Each unit features a push-activated

zero function and an associated ED light indicator. With the convenient push-

button, zero calibration can be performed without any additional equipment,

which significantly reduces time and cost for users. The dual color ED indicates

if the transmitter is at normal operation, overpressure, or in the process of zero

calibration. The enclosure consists of a flame retardant plastic top cover and a

stainless steel bottom plate for ruggedness. The pressure ranges vary from 0.1

in w.c. to 25 in w.c. unidirectional and 0.25 in w.c. to 5 in w.c. bidirectional. Wiring

time is reduced with the removeable terminal block. Each unit features a 2-wire

4 to 20 mA output that is fully protected against short circuiting and incorrect

wiring.

Mounting

Series 648B is designed for mounting by using the two (2) slots (suitable for #6

screws) that are provided on the mounting plate. For optimum performance, isolate

the instrument from vibration and provide relatively clean, dry air to the pressure

ports.

In most applications, preferred installation is with the baseplate mounted vertically

and located on a flat surface in a junction box or attached to a nearby beam. Quick

and easy field replacement is possible by removing the single case screw that

holds the housing to the baseplate and lifting the housing free. The baseplate will

remain mounted and can be used with the replacement units housing.

Piping

Two (2) 3/16˝ OD barbed pressure fittings are provided for pressure connection

with 1/8˝ ID push on tubing.

The overpressure limit with the new tension diaphragm construction is up to 15 psi

regardless of range.

Model

648B-1

648B-2

648B-3

648B-4

648B-5

648B-6

648B-7

648B-8

648B-13

648B-14

648B-15

648B-16

648B-17

Range in w.c.

0 to 0.1

0 to 0.25

0 to 0.5

0 to 1

0 to 2.5

0 to 5

0 to 10

0 to 25

0 to ±0.25

0 to ±0.5

0 to ±1

0 to ±2.5

0 to ±5

The axis most sensitive to vibration is the one perpendicular to

the baseplate. Avoid mounting with maximum vibration along

axis.

NOTICE

Electrical

The Series 648B is a two (2) wire circuit (+SUPP Y, -RECEIVER) with a 4 to 20 mA

output. The unit is calibrated at the factory using a 250 ohm load at 24 VDC.

WIRING DIAGRAM FOR 648B ERIE

Calibration

The 648B series is factory calibrated and should require no field adjustment.

However, both zero and span adjustments are provided near the screw terminal strip.

Whenever possible, any zero and/or span offsets should be corrected by software

adjustment in the user’s control system. Use the zero and span adjustments on the

648B series only if absolutely necessary. The 648B series is calibrated in the vertical

position at the factory (baseplate vertical). For use in any other orientation, position

the unit and follow the adjustment procedure listed below. If a change in range is

needed, contact the Customer Service Department for a replacement in the

appropriate range.

Zero Adjustment

While monitoring the current output with both pressure ports open to atmosphere, the

zero may be adjusted. Use push-button adjustment on the front of the unit to reset

zero.

pan Adjustment

Span or output adjustments should only done using an accurate pressure standard

(electric manometer, digital pressure gage, etc.). With FS pressure applied to the high

pressure port (reference open to atmosphere), adjust span to achieve 20 mA output.

MAINTENANCE/REPAIR

Upon final installation of the Series 648B, no routine maintenance is required. The

Series 648B is not field serviceable and should be returned if repair is needed. Field

repair should not be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” 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.

DWYER IN TRUMENT , INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U. .A. Fax: 219/872-9057 e-mail: [email protected]

POWER

SUPPLY

13-32 VDC

PRESSURE

TRANSMITTER

RECEIVER

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