DGM325A-213 datasheet, PDF - EEWORLD Datasheet

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DGM325A-213: DescriptionIndustrial Pressure Sensors FEMA; CategoryThe sensor; File Size449KB，22 Pages; ManufacturerHoneywell; Websitehttp://www.ssec.honeywell.com/

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DGM325A-213 Overview

Industrial Pressure Sensors FEMA

DGM325A-213 Parametric

Parameter Name	Attribute value
Product Category	Industrial Pressure Sensors
Manufacturer	Honeywell
Product	Pressure Switches
Operating Pressure	40 mbar to 250 mbar
Pressure Type	Differential
Accuracy	< 1 %
Port Size	G 1/2, G 1/4
Operating Supply Voltage	250 VAC
Maximum Operating Temperature	+ 60 C
Minimum Operating Temperature	- 25 C
Mounting Style	Panel
Operating Supply Current	8 A
Packaging	Bulk
Pressure Port	Port
Factory Pack Quantity	1

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Mechanical pressure switches

Tested to PE Directive 97/23/EC

DGM

Pressure monitors for fuel gases

DVGW tested to DIN EN1854

Gas pressure monitors are suitable

for all gases in accordance with DVGW

Worksheet G260 and for air.

SIL 2 according IEC 61508-2

DGM310A

Technical data

Pressure connection

External thread G 1/2 to DIN 16 288 and

internal thread G 1/4 to ISO 228 Part 1

(permissible up to 4 bar).

Switching device

Seawater-resistant diecast aluminium

GD AI Si 12.

Protection class

IP 54 for vertical installation position.

Pressure sensor materials

See Product Summary

Ambient temperature

–25 to +60°C.

At ambient temperatures below 0°C, ensure

that condensation cannot occur in the sensor

or in the switching device.

Maximum working pressure

See Product Summary

Mounting

Either directly on the pipe or with

two 4 mm ø screws on the wall surface.

Mounting position

Vertically upright and horizontal.

Setting

Continuously adjustable via the setting spindle

with a screwdriver. The set switching pressure

is visible in the scale window.

Sealing P2

On request (can be fitted later).

Switching differentials

Largely independent of the set switching

pressure. Not adjustable. For values see

Product Summary.

Switching

capacity

Normal

250 VAC 250 VDC 24 VDC

(ohm) (ind) (ohm) (ohm)

8A 5A

0.3 A

Component tested for

Testing basis

Function

Fuel gases according to DVGW Worksheet G 260

DIN EN1854

Pressure monitor

Direction of action

For maximum and minimum

pressure monitoring

Product Summary

Type

Setting range

Switching

Max.

differential

working

(mean values) pressure

Materials

Dimen-

in contact

sioned

with medium drawing

p. 25 + 26

DGM306A

DGM310A

DGM325A

DGM06A

DGM1A

DGM506

DGM516

DGM525

15…60

20…100

40…250

100…600

0.2…1.6

15…60

40…160

100…250

mbar

bar

mbar

0.8

bar

CU + Ms

1.4104

1 + 13

1 + 14

1 +12

Calibration

The

DGM

series is calibrated for rising pressure. This means that the adjustable switching pressure on

the scale corresponds to the switching point at rising pressure. The reset point is lower by the amount of

the switching differential. (See also page 27, 2. Calibration at upper switching point).

For other pressure ranges see type series DWR, page 59.

Ex-i version (intrinsically safe)

As above, but with additional function ZF513 (Ex-i).

Example for ordering:

DGM516-513

Pressure measuring connection

Care must be taken to ensure that a pressure

measuring connection is available in a suitable

place on the gas appliance.

-DGM see page 70

DVGW

TÜV

Protection Class:

IP 54

Definitions

Maximum pressure monitoring

RSP = SP – xd

Switching differential

Pressure transmitters

Accessories

Solenoid valves

Flow monitors

Temperature sensors

Thermostats

The switching differential (hysteresis) is the difference in pressure between the

switching point (SP)

and the

reset point (RSP)

of a pressure switch. Switching differential tolerances occur due to

tolerances in the microswitches, springs and pressure bellows. Therefore the data in the product

summaries always refers to average values. In the case of limiter functions the switching differential

has no significance, as one is only interested in the switching point at which cutoff occurs, not the

reset point. For a

controller function,

i. e. in the case of pressure switches used to switch a burner,

pump etc.

on and off,

a pressure switch with an

adjustable switching differential

should be

chosen. The switching frequency of the burner or pump can be varied by changing the switching

differential.

Adjustable switching differential/ calibration

In the case of pressure switches with adjustable switching differential, the hysteresis can be set within

the specified limits. The switching point (SP)

and

reset point (RSP) are precisely definable. When

setting the pressure switch, the switching differential situation and the type of factory calibration must

be taken into account. Some pressure switches (e.g. minimum pressure monitors of the DCM series)

are calibrated under "falling" pressure, i.e. switching under falling pressure takes place at the scale

value with the switching differential being above it. The device switches back at scale value +

switching differential. If the pressure switch is calibrated under rising pressure, switching takes place

at the scale value and the device switches back at scale value - switching differential (see direction of

action). The calibration method is indicated in the data sheets.

Minimum pressure monitoring

RSP = SP + xd

Direction of action

In principle, any pressure switch can be used for both maximum pressure and minimum pressure

monitoring. This excludes pressure limiters, whose direction of action (maximum or minimum) is

predefined. The only thing to remember is that the scale reading may deviate by the amount of the

switching differential. See example at bottom left: The scale value is 2.8 bar.

Maximum pressure monitoring

With rising pressure,

switching takes place once the preset switching pressure is reached (SP).

The reset point (RSP) is lower by the amount of the switching differential.

Minimum pressure monitoring

With falling pressure,

switching takes place once the preset switching pressure is reached (SP).

The reset point (RSP) is higher by the amount of the switching differential.

Direction of action in vacuum range

It is particularly important to define the direction of action in the vacuum range.

Rising does not mean a rising vacuum, but rising pressure (as viewed from absolute "0"). "Falling"

pressure means a rising vacuum.

For example: Vacuum switch set to -0.6 bar falling means: Switching (SP) takes place under falling

pressure (rising vacuum) at -0.6 bar. The reset point is higher by the amount of the switching

differential (e.g. at -0.55 bar).

Setting a pressure switch

To define the switching point of a pressure switch exactly, it is necessary to determine the direction of

action in addition to the pressure. "Rising" means that switching takes place at the set value when the

pressure rises.

The reset point is then lower by the amount of the switching differential. "Falling" means exactly the

opposite.

Please note when specifying the setting of a pressure switch:

In addition to the switching point it is also necessary to specify the direction of action (falling or rising).

Example for selection of a pressure switch:

A pump is to be turned on at 2.8 bar and off again at 4.2 bar.

Chosen type: DCMV6 according to data sheet DCM. Setting: Scale pointer to 2.8 bar (lower switching

point). Switching differential to 1.4 bar (set according to pressure gauge).

Cutoff point: 2.8 bar +1.4 bar = 4.2 bar.

Pressure switches

Mechanical pressure switches

Definitions

Mechanical pressure switches

General description

Operating mode

The pressure prevailing in the sensor housing (1) acts on the measuring bellows (2). Changes in

pressure lead to movements of the measuring bellows (2) which are transmitted via a thrust pin

(4) to the connecting bridge (5). The connecting bridge is frictionlessly mounted on hardened points

(6). When the pressure rises the connecting bridge (5) moves upwards and operates the microswitch

(7). A counter-force is provided by the spring (8), whose pre-tension can be modified by the adjusting

screw (9) (switching point adjustment). Turning the setting spindle (9) moves the running nut (10) and

modifies the pre-tension of the spring (8). The screw (11) is used to calibrate the microswitch in the

factory. The counter pressure spring (12) ensures stable switching behaviour, even at low setting values.

Pressure connection

Measuring bellows

Sensor housing

Thrust pin

Connecting bridge

Pivot points

Microswitch or other

switching elements

Setting spring

Setting spindle (switching

point adjustment)

Running nut (switching point

indicator)

Microswitch calibration

screw (factory calibration)

Counter pressure spring

Pressure sensors

Apart from a few exceptions in the low-pressure range, all pressure sensors have measuring bellows,

some made of copper alloy, but the majority of high-quality stainless steel. Measured on the basis of

permitted values, the measuring bellows are exposed to a minimal load and perform only a small lifting

movement. This results in a long service life with little switching point drift and high operating reliability.

Furthermore, the stroke of the bellows is limited by an internal stop so that the forces resulting from

the overpressure cannot be transmitted to the switching device. The parts of the sensor in contact with

the medium are welded together without filler metals. The sensors contain no seals. Copper bellows,

which are used only for low pressure ranges, are soldered to the sensor housing. The sensor housing

and all parts of the sensor in contact with the medium can also be made entirely from stainless steel

1.4571 (DNS series). Precise material data can be found in the individual data sheets.

Pressure connection

The pressure connection on all pressure switches is executed in accordance with DIN 16288 (pressure

gauge connection G 1/2A). If desired, the connection can also be made with a G 1/4 internal thread in

accordance with ISO 228 Part 1.

Maximum screw-in depth on the G 1/4 internal thread = 9 mm.

Centring pin

In the case of connection to the G 1/2 external thread with seal in the thread (i.e. without the usual

stationary seal on the pressure gauge connection), the accompanying centring pin is not needed.

Differential pressure switches have 2 pressure connections (max. and min.), each of which are to be

connected to a G 1/4 internal thread.

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