Honeywell TRM DATASHEET

18 M e c h a n i c a l T h e r m o s t a t s

Technical data

M e c h a n i c a l t h e r m o s t a t s

P r i n c i p a l t e c h n i c a l d a t a

Standard version	Terminal connection			-version
…200	…300			…700
Switch housing	Diecast aluminIum GDAISi 12			Diecast aluminIum GDAISi 12
Switching function	Floating change-over contact			Floating changeover contact.
and connection drawing	With rising pressure switching single-pole			With rising pressure switching single-pole
(applies only to version	from 3–1 to 3–2			from 3–1 to 3–2
with microswitch)
Switching capacity	8 A at 250 VAC			3 A at 250 VAC
(applies only to version	5 A at 250 VAC inductive			2 A at 250 VAC inductive
with microswitch)	8 A at 24 VDC			3 A at 24 VDC
	0.3 A at 250 VDC			0.03 A at 250 VDC
	min. 10 mA, 12 VDC			min. 2 mA, 24 VDC
Mounting position	vertical or horizontal			vertical
	preferably vertical
Degree of protection	IP 54 (terminal connection IP 65)			IP 65
(in vertical position)
Explosion protection	–			EEx de IIC T6
Code	–			II 2 G D EEx de IIC T6 IP65 T80° C
EC Type Examination	–			PTB 02 ATEX 1121
Certificate Number
Electrical connection	Plug connection to DIN 43650/			Terminal connection
	Terminal connection
Cable entry	PG 11 / for terminal connection M 16 x 1.5			M 16 x 1.5
Ambient temperature	-15 to +70 °C			-15 to +60 °C
Switching point	Adjustable with spindle.			Adjustable with spindle after
				the terminal box lid is removed.
Switching differential	Adjustable or not adjustable			Not adjustable
	(see Product Summary)
Medium temperature	Max. 70 °C, briefly 85 °C			Max. 60 °C
Vibration strength	No significant deviations up to 4 g.
	At higher accelerations the switching differential is reduced slightly.
	Use over 25 g is not permitted.
Isolation values	Overvoltage category III, contamination class 3, reference surge voltage 4000 V.
	Conformity to DIN VDE 0110 (01.89) is confirmed.
Sensor systems

Strap-on sensor		Room sensor	Capillary tube sensor	Rod sensor	Air duct sensor	Frost protection sensor
TKM		TRM	TAM	TX + R 1	TX + R 6	FT

M e c h a n i c a l T h e r m o s t a t s	19
Temperature monitoring

Te m p e r a t u r e m o n i t o r i n g

i n e x p l o s i o n - e n d a n g e re d a re a s

Temperature switches with special equipment can also be used in explosion risk area ≥ Zone 1 (21).

The following alternatives are possible:

1. Thermostats with pressure-proof encapsulated switching device, degree of protection II 2 G/D EEx de IIC T6 IP65 T 80°C

The thermostat in pressure-proof encapsulation can be used directly in explosion risk areas ≥ Zone 1 (21). The maximum switching voltage, switching capacity and ambient temperature must be taken into account and the rules for installation in the explosion risk area must be observed.

All thermostats may be equipped with explosion-proof switching devices. However, special circuits and designs with an adjustable switching differential are not permitted.

2. Thermostats in EExi version

All thermostats in the standard version can be used in explosion risk areas ≥ Zone 1, if they are incorporated into an “intrinsically safe circuit”. Intrinsic safety is based on the principle that the control current circuit in the explosion risk area carries only a small quantity of energy which is not capable of generating an ignitable spark.

Isolating amplifiers, e.g. type Ex 011, must be tested by the Physikalisch-Technische Bundesanstalt (PTB) pursuant to ATEX 100 and approved for use in explosion risk areas. Isolating amplifiers must in any event be installed outside the explosion risk area.

Thermostats which are intended for EEx-ia installations are equipped with blue terminals and cable entries. In view of the low voltages and currents carried via the contacts of the microswitches, goldplated contacts are used in the EX-i version (additional function ZFT 513).

Temperature monitoring in Zone 1 (21) and 2 (22)

Pressure-proof encapsulated	Intrinsically safe
Ex-de …	D …-513 +Ex 011
Explosion protection:	Explosion protection:
II 2 G/D EEx de IIC T6 IP 65 T80° C	EEx-ia
ATEX approval for the	ATEX approval for isolating amplifier
complete switching device	Ex 011
Thermostats with silver contact	Thermostats with gold-plated
	contacts, blue terminals and
	blue cable entries.
Switching capacity: max. 3 A, 250 VAC	Switching capacity: max. 100 mA, 24 VDC
min. 2 mA, 24 VDC		min. 2 mA, 5 VDC
	Information for devices with additional function
	ZF 513, ZF 574, ZF 576 to EN 50020:
	Ui	= 10 VDC
	Ii	= 20 mA
	Li	= 0 µH
	Ci	= 0 pF
The thermostat can be installed	The isolating amplifier must be installed
within the Ex-Zone.	outside the Ex-Zone.