Danfoss RT 123E Manual de instalación - Página 2

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Product marking

0539

Ex ia IIC T6...T1 Gb -20 °C ≤ Ta ≤ 65 °C

DEMKO 14 ATEX 1406X

IECEx ULD 14.0013X

= 29 V I

= 0.5 A P

= 0.5 nF L

= 0.2 μH

Temperature

Process temperature

class

Installation

A set of Pg13.5 cable gland is attached to the RT in a separate bag. To

ensure IP66 (units with automatic reset) or IP54 (units with external

reset) grade of RT enclosure it is necessary to assemble this gland

as shown in the fig. 2. If this gland is not used with a cable, a metal

blinding should be also assembled.

RT units can be fitted in any position. Use the mounting holes (25). With

outdoor installation, the unit should be protected against rainfall. The

bulb should be fixed to the wall by means of a bulb holding bracket

(26). If it is desired to install the bulb in a water or brine tank, this can be

done by using either a capillary stuffing box (31) or a bulb pocket (30).

If bulb pocket is to be used, for correct bulb fitting see fig. 4.

Electrical connection

See fig. 5.

START = make. STOP = break. DIFF. = differential.

Cable diameter: 6 – 14 mm

The earth terminal (38) should be connected to earth.

Wire dimension: min. 0,75mm²

Adjustment

Set the thermostat for minimum actuating temperature (range setting).

Setting is done by rotating the knob (5), at the same time reading the

main scale (9).

The differential is set by rotating the differential adjusting nut (19)

according to the nomogram concerned (fig. 3).

Maximum actuating temperature is the sum of the temperature setting

and the differential.

Example:

An RT 123E is required to regulate the temperature in a drying oven.

Max. temperature 188 °C, min. temperature 180 °C, differential

188 °C - 180 °C =8 °C.

1. Set the thermostat on 180 °C with the knob (5).

2. Set the differential adjusting nut (19) on number 3 which can be

found by reading off the nomogram for the RT 123E in fig. 3.

In general, turning the knob automatically moves both the maximum

and minimum actuating temperatures (break and make) up or down

because of the fixed differential. On the other hand, turning the dif-

ferential adjusting nut only, alters the maximum actuating temperature.

Technical data

Type

II2G

RT 14E

RT 101E

RT 107E

= 1 W

RT 123E

Permissible ambient temperature

limit [°C]

Intrinsically safe specification

300

289

194

129

Contact load

Range

[°C]

-5 – 30

25 – 90

70 – 150

150 – 250

-20 – 65 °C

= 29 V

= 0.5 A

= 1 W

= 0.5 nF

= 0.2 μH

max. 100 mA, 30 V AC / DC

min. 1 mA, 5 V AC / DC

Must be used with a certified Ex ia barrier satisfying the

input parameters.

Safety requirements

1. The refrigeration system must always comply with European Ex

installation standard, EN 60079-14, any local directive and legislation

as well as any other regulation applying in the area of installation.

2. RT-E temperature control must be used only with reliable means of

limiting the voltage and current to prevent sparks between the

contact surfaces. The equipment to be used for electrical load limit-

ing must be certified for gas group IIC. Also RT-E thermostat must

be installed as a part of IIC electrical installation.

3. Cable and cable entries approved for the application must be used.

Cables must not be in contact with sharp edges. The cable must be

connected with adequate stress relief in order to prevent that pull-

ing forces can be carried through the cable to the terminal.

4. The cycle frequency of the RT-E switch must be kept as low as possi-

ble to prevent fatique failure on the bellows. The vibration level

must be kept as low as possible.

5. It is recommended to regularly check the function of the RT-E

switch.

6. Only apparatus designed, constructed and released by Danfoss

must be used for application concerned. Danfoss can accept no

responsibility in case of alterations made on the thermostats or the

use of them against the instructions of Danfoss.

7. Any overload of the RT switch must be prevented. Overloaded or

damaged apparatus must be exchanged.

8. Only authorised persons, who are certified in installing and main-

taining refrigration system may do the installation, maintenance

and exchange of the switch. Use only appropriate tools

9. Dispose of the switch in an environmentally-friendly way.

10. RTE switches must be installed in area where is low risk of

mechanical damage.

11. Components within the equipment can exceed the enclosure tem-

perature by 1K (1°C). When the media temperature exceeds 80°C, it

is the responsibility of the user to ensure that the media tempera-

ture does not cause a thermal ignition risk on parts between the

media and the switch enclosure. Maximum media temperature on

temperature switch with 2m capillary tube is 300°C.

12. Isolation of the intrinsically safe circuit to ground and to the contact

mounting screw has been verified through 500VACrms dielectric

strength testing, carried out in accordance with IEC 60079-11:2011

section 10.3.

13. Surface of the front cover is sputtered with stainless steel - avoid

abrasion.

14. Power must be switched off before maintenance and opening the

RT-E.

Max. permissible bulb temperature

[°C]

150

300

215

300

DKRCC.PI.CB0.A7.02 | 520H10533 | 2