VNS301-353 datasheet, PDF - EEWORLD Datasheet

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VNS301-353: DescriptionIndustrial Pressure Sensors FEMA; CategoryThe sensor; File Size429KB，21 Pages; ManufacturerHoneywell; Websitehttp://www.ssec.honeywell.com/

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VNS301-353 Overview

Industrial Pressure Sensors FEMA

VNS301-353 Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Honeywell
Product Category	Industrial Pressure Sensors
Product	Pressure Switches
Pressure Type	Differential
Accuracy	< 1 %
Port Size	G 1/2, G 1/4
Operating Supply Voltage	250 VAC
Packaging	Bulk
Pressure Port	Port
Mounting Style	Panel
Maximum Operating Temperature	+ 70 C
Minimum Operating Temperature	- 25 C
Operating Supply Current	8 A
Factory Pack Quantity	1

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DNS/VNS

Pressure switches and vacuum switches with stainless steel

sensors (1.4571)

Pressure switches of the DNS series are suitable

for monitoring and controlling pressures in

chemical plants, process engineering and

any situation where the pressure of aggressive

liquids and gases must be monitored.

SIL 2 according IEC 61508-2

DNS3-201

Technical data

Pressure connection

External thread G 1/2 (pressure gauge

connection) according to DIN 16 288 and

internal thread G 1/4 according to

ISO 228 Part 1.

Switching device

Robust housing (200) made of seawater-

resistant diecast aluminium GD Al Si 12.

Protection class

IP 54, in vertical position.

Pressure sensor materials

Pressure bellows and all parts in contact with

medium. X 6 Cr Ni Mo Ti 17122 Material no.

1.4571

Mounting position

Vertically upright and horizontal.

Max. ambient temperature at switching

device

–25…+70 °C.

Max. medium temperature

The maximum medium temperature at the

pressure sensor must not exceed the permitted

ambient temperature at the switching device.

Temperatures may reach 85°C for short

periods.

Higher medium temperatures are possible

provided the above limit values for the

switching device are ensured by suitable

measures (e.g. siphon).

Mounting

Directly on the pressure line (pressure

gaugeconnection) or on a flat surface with two

4 mm Ø screws.

Switching pressure

Adjustable from outside with screwdriver.

Switching differential

For values see Product Summary.

Contact arrangement

Single-pole changeover switch.

Switching

capacity

Normal

250 VAC 250 VDC 24 VDC

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

8A 5A

0.3 A

Product Summary

Type

Setting range

Switching

differential

(mean values)

Max.

permissible

pressure

Dimen-

sioned

drawing

page 25 + 26

bar

1 + 18

1 + 16

1 + 18

1 + 16

* At very high vacuums, close to the theoretical maximum of –1 bar, the switch may not be usable in

view of the special conditions of vacuum engineering. However, the pressure switch itself will not be

damaged at maximum vacuum.

Plastic coating

The diecast aluminium housing in GD Al Si is

chromated and stove-enamelled with resistant

plastic. Corrosion tests with 3% saline solution

and 30 temperature changes from +10 to

+80°C showed no surface changes after 20

days.

-DNS/VNS

see page 66

Protection Class:

IP 54

Accessories

Solenoid valves

Calibration

The

DNS

and

VNS

series are calibrated for falling pressure. This means that the adjustable switching

pressure on the scale corresponds to the switching point at falling pressure. The reset point is higher

by the amount of the switching differential. (See also page 27, 1. Calibration at lower switching point).

Flow monitors

Switching differential adjustable

VNS301–203

–250…+100 mbar

VNS111–203

–1*…+0.1

bar

DNS025–203

0.04…0.25

bar

DNS06–203

0.1…0.6

bar

DNS1–203

0.2…1.6

bar

DNS3–203

0.2…2.5

bar

DNS6–203

0.5…6

bar

DNS10–203

1…10

bar

DNS16–203

3…16

bar

70 –300

90 –550

60 –300

80 –400

100 –600

0.15– 1.5

0.25– 2.0

0.45– 2.5

0.8– 3.5

mbar

bar

1 + 15

Temperature sensors

Switching differential not adjustable

VNS301-201

-250…+100 mbar

45 mbar

VNS111-201

-1*…+0.1

bar

50 mbar

DNS025-201

0.04…0.25

bar

30 mbar

DNS06-201

0.1…0.6

bar

40 mbar

DNS1-201

0.2…1.6

bar

60 mbar

DNS3-201

0.2…2.5

bar

0.1 bar

DNS6-201

0.5…6

bar

0.15 bar

DNS10-201

1…10

bar

0.3 bar

DNS16-201

3…16

bar

0.5 bar

1 + 15

Thermostats

Pressure transmitters

All components of the sensor system

are made of high-quality stainless steel (1.4571)

and welded using the latest methods without

filler metals. The pressure sensor

is gasket-free plasma-welded.

Pressure switches

Mechanical pressure switches

Liquids and gases

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

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