TXB490-351 datasheet, PDF - EEWORLD Datasheet

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TXB490-351: DescriptionThermostats FEMA; CategoryThe sensor; File Size165KB，5 Pages; ManufacturerHoneywell; Websitehttp://www.ssec.honeywell.com/

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TXB490-351 Overview

Thermostats FEMA

TXB490-351 Parametric

Parameter Name	Attribute value
Product Category	Thermostats
Manufacturer	Honeywell
Function	Changeover
Opening Temp	Adjustable
Closing Temp	Adjustable
Temperature Range	- 15 C to + 70 C
Current Rating	8 A
Voltage Rating	250 VAC
Product	Thermostats
Packaging	Bulk
Factory Pack Quantity	1

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Rod thermostats (without immersion tube)

Rod thermostats are suitable for direct

installation in tanks, piplines and air ducts.

The immersion well can be fitted in advance.

Sil 2 according iEc 61508-2

TX 490

Technical data

Housing

Diecast aluminium GD Al

Si 12 according to DIN

1725.

Product Summary

Type

Setting range

Switching

differential

(mean values)

Max. permissible

temperature

at sensor

Mounting position

Any, preferably vertical

permitted. ambient

+70°C

temperature at

switching device

Max. perm. tem-

See Product Summary

perature at sensor

Contact

arrangement

Single pole

changeover switch

Switching capacity

8 (5) A 250 VAC

Degree of

protection

Calibration

IP 54 according to

DIN EN60529 (with

vertical installation)

Scale value corresponds

to the lower switching

point (with falling

temperature), the upper

switching point is higher

by the amount of the

switching differential

Via angled plug to

DIN EN175301 (3-pin +

earth contact), cable

entry Pg 11, max. cable

diameter 10 mm,

cable outlet possible in

4 directions spaced 90°

apart. Supplied with plug.

Adjustable from outside

with screwdriver

Not adjustable

immersion

TXB023

TXB150

TXB490

TXB813

depth 220 mm

–20 to + 30 °C

+10 to + 50 °C

+40 to + 90 °C

+80 to +130 °C

1.5

2.5

4.0

110

125

150

°C

Plug connection

EN175301

Switching

temperature

Switching

differential

-TX

see page 118

Protection Class:

IP 54

Accessories

Solenoid valves

Flow monitors

Accessories

Immersion tube type R10/MS, R20/MS,

R10/NST, R20/NST, see page 157.

Immersion tubes for NPT thread

on request.

Dimensioned

drawing (mm)

Temperature sensors

immersion

TX023

TX150

TX490

TX813

depth 135 mm

–20 to + 30 °C

+10 to + 50 °C

+40 to + 90 °C

+80 to +130 °C

1.5

2.5

4.0

110

125

150

°C

Thermostats

Pressure transmitters

Pressure switches

Mechanical thermostats

Liquids and gases

113

General technical information

for series TX, TRM and TAM

Switching temperature

(large screw)

Switching differential

(small screw)

Electrical connection

Plug connection to DIN EN175301. Cable entry Pg 11, max. cable diameter 10 mm.

Cable outlet possible in 4 directions spaced 90° apart.

Mounting position

A vertical mounting position is preferable if at all possible. IP 54 protection is guaranteed with a

vertical mounting position. A different mounting position may alter the protection class, but the

operation of the thermostat is not affected.

Outdoor installation of thermostats

FEMA thermostats can be installed out of doors provided they are mounted vertically and suitably

protected against the direct effects of weather. At ambient temperatures below 0°C, ensure that

condensation cannot occur in the sensor or in the switching device.

Accessories

Solenoid valves

Flow monitors

Temperature limiter with reclosing lockout

Additional function ZFT205 and ZFT206:

All thermostats can be equipped with a mechanical

interlock. On reaching the value set on the scale, the microswitch trips over and remains in this

position.

The lock can be released by pressing the unlocking button (identified by a red dot on the scale side

of the switching device). The interlock can take effect with rising or falling temperature, depending on

the version.

Temperature sensors

changing the switching differential (only for switching device TrMV…)

The switching differential is changed by turning the setscrew within the spindle. The lower switching

point is not changed by the differential adjustment; only the upper switching point is shifted by the

differential. One turn of the differential screw changes the switching differential by about 1/2 of the

total differential range.

When adjusting please note:

Switching temperature:

Clockwise for lower switching point.

Anticlockwise for higher switching point.

Switching differential:

Clockwise for larger differential. Anticlockwise for smaller differential.

Thermostats

Setting the switching temperature (setpoint adjustment)

Prior to adjustment, the setscrew above the scale must be loosened by approx. 2 turns and

retightened after setting.

The switching temperature is set via the spindle. The set switching temperature is shown by the

scale.

In view of tolerances and variations in the characteristics of sensors and springs, and due to friction in

the switching kinematics, slight discrepancies between the setting value and the switching point are

unavoidable. The thermostats are usually calibrated in such a way that the setpoint adjustment and

the actual switching temperature correspond as closely as possible in the middle of the range.

Possible deviations spread to both sides equally.

clockwise: low switching temperature

Anticlockwise: high switching temperature

Pressure transmitters

Adjustment of thermostats at lower switching point

Setpoint x

corresponds to the lower switching point (with falling temperature), the upper switching

point x

(with rising temperature) is higher by the amount of the switching differential x

Pressure switches

Mechanical thermostats

General technical information

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