Calex ExTemp Series Operator's Manual

ExTemp Series

Intrinsically Safe Infrared Temperature Sensor

and LCT Loop Configuration Tool

Operator’s Guide

2

INTRODUCTION

ExTemp intrinsically safe non-contact infrared temperature sensors measure the temperature
of an area of the surface of a solid or liquid, and transmit this as a two-wire, linear 4-20 mA
output.

Temperature ranges from -20°C to 1000°C are available. All models have an adjustable
emissivity setting, and may be used to measure a wide variety of target materials, including
food, paper, textiles, plastics, leather, tobacco, pharmaceuticals, chemicals, rubber, coal,
asphalt and paint.

A choice of precision optics is available to measure small or large targets at short or long
distances.

The optional LCT Loop Configuration Tool (USB adapter) and free software allow the
ExTemp to be connected to a PC for temperature indication, sensor configuration and data
acquisition.

These sensors are designed primarily for use in hazardous areas in conjunction with a
suitable safety barrier or isolator. All models have been certified Intrinsically Safe for use
in gas and dust hazardous areas by Certification Management Ltd. They comply with the
European ATEX Directive 2014/14/EU and are covered by certificates for IECEx (international)
and TIIS (Japan).

IMPORTANT INFORMATION FOR USE:

Voltage MUST be supplied by a suitably rated safety barrier or isolator.

For re-configuration of the sensor, the LCT MUST be connected in the safe area, behind the
protection of a safety barrier or isolator.

The ExTemp dust certification relies upon the ingress protection provided by the device
enclosure and therefore the device MUST NOT be opened. Care should be taken to avoid
inadvertently loosening the cable gland when tightening locknuts.

Do not attempt to repair a faulty unit. Contact the vendor to arrange a return.

CONFORMANCE TO REQUIREMENTS

This product has passed a high voltage withstand test up to 700 VDC.

This product utilises the reduced creepage and clearance distances of ANNEX F by meeting
the requirements of IP65 and an Overvoltage Category I.

SAFETY PARAMETERS:

The device must not be used outside of the ambient temperature range (Ta) or subjected to
voltages, current or power greater than those listed below, in order to ensure safe operation
of the device:

Ui = 28 V Ta = -20°C to +70°C

Ii = 93 mA Ci = 8 nF

Pi = 650 mW Li = 0 mH

INTRINSIC SAFETY CERTIFICATION

All models of the ExTemp have been issued an ATEX (CML 14ATEX2079) Certificate for use in
both gas and dust explosive atmospheres in above ground installations.

Given the ExTemp conforms to the highest level of protection ‘ia’, it is suitable for use in all
Zones. The maximum energy stored in the device and the maximum surface temperature in
both normal operation, and under fault conditions, also make the ExTemp suitable for use
within all Gas and Dust Groups with a temperature rating of T4 or lower.

Tables 1, 2 and 3 describe the ATEX Gas and Dust Groups, Gas and Dust Zones, and gas
ignition temperature classifications in which the ExTemp is suitable:

3

Zone Description Supported?

Gas 0 Explosive gas air mixture continuously present.



1 Explosive gas air mixture likely to occur in normal

operation.



2 Explosive gas air mixture not likely to occur, and if it does

it will only exist for a short time.



Dust 20 Explosive atmosphere in the form of a cloud of

combustible dust in air is continuously present, or for long
periods or frequently.



21 Explosive atmosphere in the form of a cloud of

combustible dust in air is likely to occur occasionally in
normal operation.



22 Explosive atmosphere in the form of a cloud of

combustible dust in air is not likely to occur in normal
operation, but if it does occur, will only persist for a short
period.



Group Definition Supported?

Gas IIA e.g. Propane



IIB e.g. Ethylene



IIC e.g. Hydrogen



Dust IIIA Combustible flyings



IIIB Non-conductive dusts



IIIC Conductive dusts



Table 1: Gas and Dust Zones in which the ExTemp may be used

Table 2: Gas and Dust Groups in which the ExTemp is suitable for use

Table 3: Gas ignition temperature classifications to which the ExTemp conforms

Gas Ignition Temperature Classification Supported?

450 °C T1



300 °C T2



200 °C T3



135 °C T4



100 °C T5 NO

85 °C T6 NO

4

MODEL NUMBERS

SPECIFICATIONS

EX

----

FFF

CTT LL

Field of view
21 = 2:1 divergent optics
151 = 15:1 divergent optics
301 = 30:1 divergent optics
CF = Close focus optics
(Spot Ø 5 mm at distance 100 mm)

Temperature Range
LT = -20°C to 100°C
MT = 0°C to 250°C
HT = 0°C to 500°C
XT = 0°C to 1000°C
ST = Special temperature range

Temperature range may be re-scaled
between limits -20°C and 1000°C via optional
USB adapter and software

Cable Length
5 = 5 m
10 = 10 m
25 = 25 m

User Configurable
C = Configurable via optional USB adapter

General

Temperature Range -20°C to 1000°C (see table of Model Numbers)

Output 4 to 20 mA

Minimum Temperature Span 100°C

Maximum Temperature Span 1000°C

Field of View See table of Model Numbers

Accuracy ± 1°C or 1%, whichever is greater

Repeatability ± 0.5°C or 0.5%, whichever is greater

Emissivity Setting Range 0.20 to 1.00 (pre-set to 0.95)

Emissivity Setting Method User configurable via optional LCT Loop Configuration

Tool (USB adapter)

Response Time, t90 240 ms (90% response)

Spectral Range 8 to 14 μm

Supply Voltage 12 to 24 V DC ± 5%

Minimum Sensor Voltage 11.4 V DC

Maximum Current Draw 25 mA

5

Mechanical

Construction Stainless Steel 316

Major Dimensions Ø 20 x length 150 mm (see Dimensions)

Mounting M20 x 1.5 mm thread, length 46 mm, supplied with two

mounting nuts

Cable Length Choice of 5 m, 10 m or 25 m factory-fitted. Contact

Calex for information about extending cable.

Weight with 5 m Cable 475 g

Environmental

Environmental Rating IP65 (NEMA 4)

Ambient Temperature Range 0°C to 70°C (Operating range)

Relative Humidity Max. 95% non-condensing

CE Marked Yes

RoHS Compliant Yes

Hazardous Area Classification

ATEX Classification Ex II 1GD

IECEx Classification (Gas) Ex ia IIC T4 Ga

IECEx Classification (Dust) Ex ia IIIC T135°C IP65 Da

Ambient Temperature Rating -20°C ≤ Ta ≤ 70°C

Maximum DC Input Voltage Ui = 28 V

Maximum Input Current Ii = 93 mA

Maximum Input Power Pi = 650 mW

Maximum Internal Capacitance Ci = 8 nF

Maximum Internal Inductance Li = 0 mH

ATEX Certificate Number CML 14ATEX2079

IECEx Certificate Number IECEx CML 14.0032

TIIS Certificate Number TC21097

DIMENSIONS (MM)