Absolute Process Instruments Cecomp DPG1000DRBL Series Instructions - Page 2

Parcourez en ligne ou téléchargez le pdf Instructions pour {nom_de_la_catégorie} Absolute Process Instruments Cecomp DPG1000DRBL Series. Absolute Process Instruments Cecomp DPG1000DRBL Series 2 pages. 4-wire digital pressure transmitters

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Instructions

Precautions

4 Read these instructions before using the gauge. Configuration may

be easier before installation. Contact the factory for assistance.

4 These products do not contain user-serviceable parts. Contact us

for repairs, service, or refurbishment.

4 Gauges must be operated within specified ambient temperature ranges.

4 Outdoor or wash down applications require a NEMA 4X gauge or

installation in a NEMA 4X housing.

4 Use a pressure or vacuum range appropriate for the application.

4 Use fittings appropriate for the pressure range of the gauge.

4 Due to the hardness of 316 stainless steel, it is recommended that

a thread sealant be used to ensure leak-free operation.

4 For contaminated media use an appropriate screen or filter to

keep debris out of gauge port.

4 Remove system pressures before removing or installing gauge.

4 Install or remove gauge using a wrench on the hex fitting only. Do

not attempt to turn gauge by forcing the housing.

4 Good design practice dictates that positive displacement liquid

pumps include protection devices to prevent sensor damage from

pressure spikes, acceleration head, and vacuum extremes.

p Avoid permanent sensor damage! Do not apply vacuum to non-

vacuum gauges or hydraulic vacuum to any gauges.

p Avoid permanent sensor damage! NEVER insert objects into

gauge port or blow out with compressed air.

 Gauges are not for oxygen service. Accidental rupture of sensor dia-

phragm may cause silicone oil inside sensor to react with oxygen.

p NEVER connect the gauge wires directly to 115 VAC or perma-

nent damage will result.

Cecomp maintains a constant effort to upgrade and improve its products.

Specifications are subject to change without notice. See cecomp.com for

latest product information. Consult factory for your specific requirements.

WARNING: This product can expose you to chemicals including

lead, nickel and chromium, which are known to the State of

California to cause cancer or birth defects or other reproductive

harm. For more information go to www.P65Warnings.ca.gov

Types of Gauges

Gauge reference types read zero with the gauge port open.

Bipolar ranges read positive pressure and vacuum in the same

units, and zero with the gauge port open.

1000 psi and higher sensor are a sealed reference type. They read

zero with the gauge port open are internally referenced to 14.7 psi.

They are functionally similar to gauge reference sensors.

Absolute reference gauges read zero at full vacuum and atmospheric

pressure with the gauge port open. With an open gauge port, read-

ings will vary continuously due to fluctuating barometric pressure.

Electrical Connection

The DPG1000DR and F4DR series can be powered by any 9 to

32 VDC or 8 to 24 VAC 50/60 Hz power source. An inexpensive

unregulated low voltage source can be used. The magnitude of the

supply voltage has negligible effect on the gauge calibration as long

as it is within the stated voltage ranges.

Do not allow the gauge supply voltage fall below 9 VDC or 8 VAC RMS.

Operation below these values may cause erratic or erroneous readings

or output. Models with 4-20 mA output power the current loop. Use a

power source with sufficient voltage to operate the current loop.

Connection is made with the four conductor cable at the gauge

rear. This cable accommodates both the gauge power supply and

retransmission output.

Connect power as shown below. When using low voltage AC

power, either polarity may be used. Use the correct polarity with

a DC supply.

Connect the retransmission output as shown below. Use of the

shield (drain) wire is optional. It is not generally needed for 4-20 mA

current loops unless very long cable lengths are used in electrically

noisy environments.

The power supply (–) l ead is tied to the retransmission output

ground. Therefore, if a DC supply is used, the power supply (–) lead

should be considered common with regard to the retransmission

output (–) connection.

If the analog output is not required, the transmitter will function as

a low voltage powered gauge. Protect the output wires to prevent

a short circuit.

RED +

BLACK –

GREEN –

–

WHITE +

Remote Device

Optional

shield

connection

C E C OMP

Div. of

Using the Retransmission Output

NEVER connect retransmission output wires together or to an

external power source or permanent damage not covered by war-

ranty will result.

For 4-20 mA output models, be sure to observe the output compli-

ance (voltage drive) capabilities of the gauge. The compliance, and

therefore the maximum loop resistance the output can drive, is a

function of the supply voltage to the gauge.

Consult the graph shown below for maximum loop resistance vs. power

supply voltage. Too large a loop resistance will cause the gauge output

to "limit" or saturate before reaching its full 20 mA output.

When using the 0-2 volt retransmission output, do not allow the

resistive load on the output to fall below 5K ohms. Avoid large

capacitive loads (greater that 1000 pF) such as those caused by

long runs of shielded cable. For long cable runs, use a 4-20 mA

output model.

Voltage Compliance for 4-20 mA Retransmission Output

1400

1200

1000

800

600

400

200

Operation

The DPG1000DR and F4DR are designed for continuous operation.

The gauge is powered on whenever a supply voltage is applied.

Warm-up time is negligible. During normal operation the system

pressure is displayed on the LCD and a corresponding output signal

is present.

DPG1000DRBL and F4DRBL display backlighting are on whenever

the power is on. The display backlighting will not be apparent under

bright lighting conditions.

Output Ranges

The output is a continuous analog signal based on the transducer

output rather than the display. The output is filtered to improve

noise immunity and has a response time of about 50 msec.

Characteristics of the output types are listed below. Values are

factory set. Note that –15 psi, –100 kPa, etc. are not achievable, but

prevents running out of range at whatever full vacuum is reached.

Range Type

Gauge reference

pressure

Gauge reference

vacuum

Absolute reference

Gauge reference

vacuum/pressure

Test Function

When the front-panel TEST button is held depressed, the display

and analog output are switched, independent of the system pres-

sure, to a test level determined by the setting of the Test potenti-

ometer. This test mode will allow setup and testing of the output

by switching to this test level whenever desired without having to

alter the system pressure.

Power (+)

To set the test output level, see gauge label for location of Test

Power (–)

potentiometer. Remove the Test potentiometer cover. Press and

hold the front-panel TEST button and adjust the Test potentiometer

to set the display and output to the desired test level.

BSOLUTE

ROCESS

Supply Voltage (DC or AC RMS)

Output

"0" on

–15 psi

Option

display

pressure

-I

n/a

4 mA

-V

n/a

0 V

-I

20 mA

4 mA

-V

2 V

0 V

-I

4 mA

-V

0 V

-I

4 mA

12 mA

-V

0 V

1 V

1220 American Way Libertyville, IL 60048

NSTRUMENTS

DPG1000DR, F4DR

Calibration Preparation

Gauges are calibrated at the factory using equipment traceable to NIST.

There is no need to calibrate the gauge before putting it into service.

Calibration should only be performed by qualified individuals using

appropriate calibration standards and procedures. Gauges can

be returned to factory for certified recalibration and repairs. NIST

traceability is available.

Calibration intervals depend on your quality control program

requirements and as-found data. Many customers calibrate their

equipment annually.

The calibration equipment should be at least four times more accu-

rate than the gauge being calibrated. The calibration system must

be able to generate and measure pressure and/or vacuum over the

full range of the gauge.

A vacuum pump able to produce a vacuum of 100 microns (0.1

torr or 100 millitorr) or lower is required for vacuum and absolute

gauges.

Use a stable DC power supply and an accurate mA meter for

calibration of 4-20 mA transmitters and an accurate volt meter for

calibration of voltage transmitters.

Allow the gauge to equalize to normal room temperature for at least

20 minutes before calibration.

Calibration

1. See rear label of gauge for range.

2. Remove the covers on the Zero and Span controls on the front of

the gauge. Zero calibration must be done before span calibration.

If desired, gauges can be zeroed without doing span calibration.

3. Connect gauge to a 9-32 VDC or 8-24 VAC 50/60 Hz power

source. The magnitude of the supply voltage has negligible

effect on the gauge calibration as long as it is within the stated

voltage ranges. Over voltage may result in damage.

4. Zero for gauge reference pressure or vacuum gauges: With

the gauge port open to atmosphere, adjust the Zero potenti-

ometer for a display indication of zero with the minus (–) sign

occasionally flashing. Output should be 4.0 milliamps for mA

output models or 0 volts for voltage output models.

Zero for absolute reference gauges: Apply full vacuum to the

gauge. Adjust the Zero potentiometer for a display indication of

zero with the minus (–) sign occasionally flashing. Output should

be 4.0 milliamps for mA output models or 0 volts for 0-2 volt

output models.

Zero for bipolar gauges: Apply full vacuum to the gauge.

Adjust the Zero potentiometer for a display indication of full

vacuum. Output should be 4.0 milliamps for mA output models

or 0 volts for 0-2 volt output models.

5. Span for gauge reference pressure, absolute reference, and

bipolar gauges: Apply full-scale pressure and adjust the Span

potentiometer for a display indication equal to full-scale pres-

sure. Output should be 20.0 milliamps for mA output models or

2 volts for voltage output models.

Span for gauge reference vacuum gauges: Apply full vacuum

to the gauge. Adjust the Span potentiometer for a display indica-

tion equal to full-scale vacuum. Output should be 20.0 milliamps

for mA output models or 2 volts for voltage output models.

Full

6. Verify pressure indications at 0%, 25%, 50%, 75%, and 100%

of full scale and repeat calibration as needed to achieve best

20 mA

accuracy over desired operating range.

2 V

7. Internal Zero and Span potentiometers adjust the analog out-

n/a

put to agree with display. These normally do not need to be

n/a

adjusted. If the output does need adjustment, remove the rear

20 mA

cover to access the potentiometers. See image below. Adjust

2 V

output Span and then Zero after gauge calibration is complete.

20 mA

8. Replace the potentiometer covers, rear cover and screws, taking

2 V

care not to pinch the wires between the case and the rear cover.

cecomp.com

800-942-0315

Output

Span

Output

Zero