What is a Temperature Gauge, and what are their types & specifications?

Temperature gauge:

It is a field-mounted temperature sensor.
It measures the present temperature of the body.
The temperature gauge is a dial-type temperature-indicating device.
The gauge is used only for display purposes, but this is not used to control the temperature of the body.
Temperature gauges are available in various dial sizes, various ranges, and in different scales such as Degrees-Celsius and Degrees Fahrenheit scales.
Most of the process industries use gauges having a Degree Celsius scale.

Various types of gauges used in industries are discussed below:

1. Bimetal Dial Thermometer Temperature Gauge:

Features:

The bimetal Dial thermometer consists of a bimetal strip in the form of a helix
It works on the principle of thermal expansion: when two metals with different coefficients of expansions are joined to form a bimetal. The expansion of bimetal is proportional to changes in temperature.
Bimetal dial thermometers are simple in construction.
Rugged construction with Protection class IP-67
Suitable for most industrial process applications
The temperature range varies from – 50 to 600 Degrees Celsius.
It has a rigid stem with a fast Response is fast.
Hermetically sealed case.
It is available with bottom entry, back entry, and every angle rotatable construction.
Accuracy ± 1%Full Scale Deflection.
Repeatability is high and has minimum hysteresis.

Specifications:

Reference Standard	ASMEB 40.200, EN 13190
Dial	100 mm or 150 mm aluminium white background with black markings.
Case	Stainless Steel-304 or 316 with bayonet bezel.
Protection	Weatherproof IP – 67 class (IS/IEC : 60947 / IEC : 60529)
Window	Shatter proof glass
Pointer	Aluminium, black, micrometre adjustable
Stem	SS304 or SS316 in 6 mm, 8 mm, 10 mm, and 12 mm diameter, and length varies from 100 mm to 1000 mm.
Connection	Standard Half-inch NPT connection
Range	50Degree C to 600 Degree C with a minimum span of 60 Degree C.
Accuracy	± 1% Full Scale Deflection
Over range	125% Full Scale Deflection up to max temperature range of 500°C
Reset	Micrometer Pointer (standard), External (optional)
Optional	1) Silicon Oil Filled Case Suitable up to 339°C Max 2) Contacts: 1 SPST, N-O to close on the rise of drop in temperature (specify action required) adjustablefor full range, with a current rating of 30 VA @ 230 V AC, only for 100 mm dial, back entry.

Ordering Information MODEL: BDT

MOUNTING			V Bottom Entry, Local Mounting C Back Entry, Local Mounting E Every Angle, Local Mounting
DIAL			10 -100 mm 15 -150 mm
CASE			S4 SS304 S6 SS316
STEM Outer Diameter			A 6 mm B 8 mm C 10 mm D 12 mm
STEM LENGTH			Specify in mm
STEM MATERIAL			S4-SS304 S6-SS316
CONNECTION
SIZE		TYPE		MALE/FEMALE	METRIC THREADS
6	¼ inch	NT	NPT	M Male	18 M – M 18 * 1.5
10	3/8 inch	BP	BSP	F Female	20 M – M 20 * 1.5
15	½inch	BT	BSPT		24 M – M 24 * 1.5
20	¾ inch	PF	PF		XX- Any other
25	1 inch	GS	Gas
		NS	NPS
RANGE			0 to 600
UNIT			Degree Celsius, Degree Fahrenheit
OPTION			A	Thermo well
			C	Colour Band
			D	Dual Scale
			E	1 SPST Electrical contact
			S	Silicon Oil Filled Case *
* Silicon Oil Filled Case shall be applicable up to the maximum temperature of 339°C only			** Ranges mentioned are in °C. An equivalent unit in °F can be provided on request

2. Gas Filled Dial Thermometer Temperature Gauge:

Features:

Gas-filled dial thermometer temperature gauges defeat the limitations of other temperature gauges
It operates over a wide temperature range of about – 200 to 800 Degrees Celsius
The stem is offered without accuracy loss.
The capillary length of this dial-type gauge is up to 25m
Inert (N2) gas is nonhazardous, and the nontoxic nature of the filled systems makes it an ideal choice for a cross-section of industries.
Suitable for sanitary application
All SS construction
Rigid stem or capillary type
Fast response
High reliability and accuracy ± 1% FSD
IP-67 protection

Specifications:

Reference Standard	ASMEB 40.200, EN 13190
System	Nitrogen Gas filled compensated in accordance with SAMA CI. Ill B
Dial	100 mm or 150 mm aluminium white background with black markings.
Case	Stainless Steel-304 or 316 with bayonet bezel.
Protection	Weatherproof IP – 67 class (IS/IEC : 60947 / IEC : 60529)
Window	Shatter proof glass
Pointer	Aluminium, black, micrometre adjustable
Stem	Stainless Steel- 304 or 316 in 6 mm, 8 mm, 10 mm, and 12 mm diameter as standard Connection
Connection	11/2 inch NPT adjustable.
Range	(-) 200°C to 800°C with a minimum span of 80°C
Accuracy	± 1% FSD
Over range	125% Full Scale Deflection up to max temperature range of 500°C
Reset	Micrometer Pointer (standard)
Optional	Silicon Oil Filled Case Suitable for about 339°C

Ordering Information: GDT-R / GDT-C

GDT-R – Rigid Stem

GDT-C – Capillary Type

MOUNTING			V Bottom Entry, Local Mounting C Back Entry, Local Mounting E Every Angle, Local Mounting S Bottom Entry, Surface Mounting P Back Entry, Panel Mounting Y Bottom Entry, 2″ Pipe Mounting
DIAL			10 -100 mm 15 -150 mm
CASE			S4 SS304 S6 SS316
STEM Outer Diameter			A 6 mm B 8 mm C 10 mm D 12 mm
STEM LENGTH			Specify in mm
STEM MATERIAL			SO – SS310 S4-SS304 S6-SS316 16 – Inconel 600
Capillary			Type		Length
			SC SS Covered SP SS Covered + PVC SA SS Covered + SS Armoured SAP SS Covered + SS Armoured + PVC N Not Applicable for GDT-R type.		In meter
CONNECTION
SIZE		TYPE		MALE/FEMALE	METRIC THREADS
6	¼ inch	NT	NPT	M Male	18 M – M 18 * 1.5
10	3/8 inch	BP	BSP	F Female	20 M – M 20 * 1.5
15	½inch	BT	BSPT		24 M – M 24 * 1.5
20	¾ inch	PF	PF		XX- Any other
25	1 inch	GS	Gas
		NS	NPS
RANGE			0 to 800
UNIT			Degree Celsius, Degree Fahrenheit
OPTION			A	Thermo well
			C	Colour Band
			D	Dual Scale
			E	1 SPST Electrical contact
			S	Silicon Oil Filled Case *
			** Ranges mentioned are in °C. An equivalent unit in °F can be provided on request

3.Liquid-Filled Dial Thermometer Temperature Gauge:

Features:

Temperature measurement is based on the principle of liquid-filled expansion
Temperature range (-) 30°C to 250°C
Replaces mercury-type thermometers.
Used in various industries such as food processing, pharmaceutical, and biotechnology.
The main advantage is the minimum immersion length required for sensing (30mm) which makes it suitable for lower line sizes
Rugged construction.
Accuracy ± 1% FSD

Specifications:

Reference Standard	ASMEB 40.200, EN 13190
System	Liquid-filled type compensated in accordance with SAMA CI. I-B
Dial	100 mm or 150 mm aluminium white background with black markings.
Case	Stainless Steel-304 or 316 with bayonet bezel.
Protection	Weatherproof IP – 67 class (IS/IEC : 60947 / IEC : 60529)
Window	Shatter proof glass
Pointer	Aluminium, black, micrometre adjustable
Stem	Stainless Steel- 304 or 316 in 6 mm, 8 mm, 10 mm, and 12 mm diameter as standard material. (possible immersion length must be about 30 mm)
Capillary	SS Covered/SS Covered + PVC/SS Covered + SS armored/SS Covered + SS Armoured +PVC (up to 5 Mtr.).
Connection	1/2 inch NPTas standard with adjustable compression fitting.
Range	(-) 30°C to 500°C with a minimum span of 50°C
Accuracy	± 1% FSD
Over range	125% FSD (up to max temp range of 500°C )
Reset	Micrometer Pointer
Optional	Silicon Oil Filled Case

Ordering Information LDT-R / LDT-C:

LDT-R – Rigid Stem

LDT-C – Capillary Type

MOUNTING			V Bottom Entry, Local Mounting C Back Entry, Local Mounting E Every Angle, Local Mounting S Bottom Entry, Surface Mounting P Back Entry, Panel Mounting Y Bottom Entry, 2″ Pipe Mounting
DIAL			10 -100 mm 15 -150 mm
CASE			S4 SS304 S6 SS316
STEM Outer Diameter			A 6 mm B 8 mm C 10 mm D 12 mm
STEM LENGTH			Specify in mm
STEM MATERIAL			SO – SS310 S4-SS304 S6-SS316 16 – Inconel 600
Capillary			Type		Length
			SC SS Covered SP SS Covered + PVC SA SS Covered + SS Armoured SAP SS Covered + SS Armoured + PVC N Not Applicable for LDT-R type.		In meter, up to 5 Mtr max
CONNECTION
SIZE		TYPE		MALE/FEMALE	METRIC THREADS
6	¼ inch	NT	NPT	M Male	18 M – M 18 * 1.5
10	3/8 inch	BP	BSP	F Female	20 M – M 20 * 1.5
15	½inch	BT	BSPT		24 M – M 24 * 1.5
20	¾ inch	PF	PF		XX- Any other
25	1 inch	GS	Gas
		NS	NPS
RANGE**			0 to 250
UNIT			Degree Celsius, Degree Fahrenheit
OPTION			A	Thermo well
			C	Colour Band
			D	Dual Scale
			E	1 SPST Electrical contact
			S	Silicon Oil Filled Case *
			** Ranges mentioned are in °C. An equivalent unit in °F can be provided on request

4. Indicating Temperature Switch:

Features:

Combines indication with switching in order to make or break the associated electrical circuit
Can be offered with contact assembly as well as micro switch (as a combination of switch and movement)
Fast response
Switching accuracy ± 2% FSD
High repeatability and low hysteresis
Flameproof version available
Case compensated system

Specifications:

Reference	Nitrogen gas filled type compensated in accordance with SAMA CI. III-B
Dial	100 mm or 150 mm aluminium white background with black markings.
Case	Stainless Steel-304 or 316 with bayonet bezel.
Protection	Waterproof to IP – 67 (IS/IEC: 60947 / IEC: 60529) Flameproof to IIA MB (Equivalent to NEC CI. I Div 2 Gr. C&D) Flameproof to IIC (Equivalent to NEC CI. Div 1 Gr. A&B)
Stem	Stainless Steel-304/316 in 6 mm, 8 mm, 10 mm, 12 mm diameter as standard material.
Capillary	SS Covered/SS Covered + PVC/SS Covered + SS armoured/SS Covered + SS Armoured +PVC (up to 25 Mtr.).
Connection	½ inch NPT compression fitting as the standard connection.
Range	(-) 200°C to 800°C with a minimum span of 80°C
Accuracy	± 1% FSD for indication, ± 2% FSD for switching.
Over range	125% FSD
Contacts	1) SPST, single, normally open, closes on rising in temperature or vice versa, rated 30 VA @ 230V AC
Accessory	Relay for the contact assembly to match the current of 5 amp @ 230 V AC separate mounted.
Note	a. Flameproof version is offered with Single Pole Double Throughput Micro switch in Die-Cast only in Aluminium housing. b. For minimum insertion length essential for propersensing, contact our design department. c. Three-point calibration certificate accompanies each thermometer. d. For operating temp>600°C; the stem of SS310 / Inconel 600 shall be recommended.

Ordering Information MODEL : GDT-SW-R / GDT-SW-C

GDT-SW-R – Rigid Stem

GDT-SW-C – Capillary Type

MOUNTING			V Bottom Entry, Local Mounting C Back Entry, Local Mounting E Every Angle, Local Mounting S Bottom Entry, Surface Mounting P Back Entry, Panel Mounting Y Bottom Entry, 2″ Pipe Mounting
DIAL			10 -100 mm 15 -150 mm
CASE			S4 SS304 S6 SS316
STEM Outer Diameter			A 6 mm B 8 mm C 10 mm D 12 mm
STEM LENGTH			Specify in mm
STEM MATERIAL			SO – SS310 S4-SS304 S6-SS316 16 – Inconel 600
Capillary			Type		Length
			SC SS Covered SP SS Covered + PVC SA SS Covered + SS Armoured SAP SS Covered + SS Armoured + PVC N Not Applicable for GDT-SW-R type.		In meter, up to 5 Mtr max
CONNECTION
SIZE		TYPE		MALE/FEMALE	METRIC THREADS
6	¼ inch	NT	NPT	M Male	18 M – M 18 * 1.5
10	3/8 inch	BP	BSP	F Female	20 M – M 20 * 1.5
15	½inch	BT	BSPT		24 M – M 24 * 1.5
20	¾ inch	PF	PF		XX- Any other
25	1 inch	GS	Gas
		NS	NPS
RANGE**			0 to 850
UNIT			Degree Celsius, Degree Fahrenheit
OPTION			A	Thermo well
			C	Colour Band
			D	Dual Scale
			E	1 SPST
			F	2 SPST
			G	1 SPDT
			H	2 SPDT
			R	Relay
			FA	Flame Proof Case (IIA, IIB)
			FC	Flame Proof Case (IIC)
* Die Cast with Aluminium casing is available only for the Flameproof Version..			** Ranges mentioned are in °C. An Equivalent unit in °F scale is issued on request

5. Digital Display Thermometer / Indicator:

The Digital / Wireless Thermometer range is replaced by digital temperature gauges. These digital gauges are contemporary more superior in technology.

Features:

Universal RTD or Thermocouple input.
BATTERY Powered.
USB & NFC Interface for easy data transfer.
Alarm or Relay configured to indicate lower battery status .
User set display messaging.
5000 Point data logging along with Real-time clock.
This is not only a temperature-displaying unit.
It functions as a data logger to download the information by using an android application.
It displays information such as over temperature and low battery.

DM-650TMSCH4: Digital Display with IP67 Plastic Housing:

This consists of a battery-powered indicator 6-digit LCD to display sensor temperature in Degrees Celsius and in Degrees Fahrenheit scale.
It allows the user to display up to two messages of up to 32 characters.
the user has the option to set an alarm within a temperature range.
The translation relay is used together with messaging and alerts to provide switching at user-set switch points.
Data logger to store up to 5000 points.
Feature highlights include relay trips, data logging functions, and battery-powered and real-time clocks.

DM-650 TMSS: Digital Display with Stainless Steel Housing:

It consists of stainless steel housing, best suited for rough climatic conditions. It also includes a DUAL relay. The two transition relay is used together with messaging and alerts to provide switching at user-set switch points.
Feature highlights include dual relays, a data logging function, battery-powered, real-time clock (great for stamping data logged points).

DM-650TMSSF: Digital Display with Stainless Steel body and panel for Wall Mounting:

This indicator features all of the above functions. The addition is a Stainless Steel mounting panel that can be used for an application requiring the indicator to be fixed on a wall or panel.