VOC Transmitter

VOC Transmitter

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  • PID gas detector capable of detecting the smallest leak of gases whose ionization potential is <10.6 eV.
  • Highly resistant to poisoning and etching.
  • Digital display of Gas Concentration on the LCD with Auto backlit.
  • Password protected function menu.
  • Standard 4-20 mA output with fault indication current output.
  • Low, High configurable Alarms with Visual alerts.
  • Optional alarm relay contacts.
  • One man auto software gas calibration.
  • Gas concentration can be displayed in PPM or PPB.
  • Auto scaling of gas concentration from PPB to PPM.
  • Easy handling & programming with 3 keys.
  • It can be programmed from line of sight up to 10 meters using IR remote control.
  • For flameproof enclosures programming is possible using magnetic pen.
  • MODBUS RS 485 serial port available for digital communication.


  • Manufacturing.
  • Processing.
  • Offshore .
  • Chemical.
  • Pharmaceutical
  • Indoor air Quality
  • Pulp & Paper
  • Solvent Recovery system
  • Industrial painting & coating
  • Waste water treatment plants.
  • Refineries & Petrochemical plants
  • including offshore drilling & plant shut-downs.



Volatile Organic Compounds (VOC's) with ionization potential < 10.6 eV. Please select from the list given below

Range/ Resolution

Available in PPM & PPB with the range of 0-9999 PPM or PPB (Factory settable), Resolution depends on Gas Ordered, Typical resolution is 1 PPM/PPB


PPB to PPM with range 0-9999. Up to 0-9999 concentration will be displayed in PPB then it will get scaled to PPM.


+ 5% of reading or + 2% of range (Greater of)

Sensor type

Photo ionization detection based sensors, with sensor life of 5 years.

Standard output

Programmable Linear 4-20 mA O/P with respect to Gas concentration range, optional RS - 485 Modbus Output


8 x 2 LCD Display with Backlit.

LED Indication

RL1 & RL2 for Relay1 and Relay 2 respectively, HTY for Healthy Check, PRG for Programming mode, CAL for calibration mode, KEY for sensing key press, TX & RX for RS 485 Communication.


Setting by 3 keys on front panel i.e. SET / NEXT SHIFT INCREMENT


i) By display: Sensor break/open shows OPEN SENSOR and Over range shows OVER RANGE.
ii) By Standard O/P current: Sensor break/open :3.7mA, Over range: 21mA, Startup menu and Operation modes: 3.8mA and Normal working mode:4-20mA.

Supply Voltage

CE Certified 18VDC to 36VDC power supply. 100 mA at 24 VDC.


1.5 sq. mm 3 Core, Flexible OR Armored shielded cable.

Operating Temperature

-40 to 55oC + 5%

Relative Humidity

Below 95% non condensing

Sensor Housing

P.V.C. / material / SS316, Please select while ordering.

Enclosure Detail



Protection Class

IP- 65

IP-65 for Gas Gr. IIA, IIB & IIC ATEX, CCOE, CMRI approved enclosure

Cabinet Material

Polycarbonate, Grey colour

Cast Aluminium alloy, LM-6 / C.I. Enclosure

Cable Entry

Thermoplastic cable gland (IP - 68)

Double compression cable gland (Ex-Proof),- ET-type


190 (H) x 80 (W) x 55 (D) in mm

180 (H) x 205 (W) x 110 (D) in mm


Wall Mounting / Stand Mounting / Pipe Mount

Wall Mounting / Stand Mounting / Pipe Mount


Approx 350 Grams

Approx 2.0 Kg


Flame Proof or Non Flame Proof Industrial Hooter, Hooter cum Flasher, Chart recorder, Cables, 24 VDC power supply, Gas calibration kit, Canopy mounting stand, RS 485 MODBUS, SCADA Software & IR Remote control.


Detection Method

Photo Ionization Detection (PID)

Gases Detected

Volatile Organic compounds with ionization potential less than 10.6eV. Select from table below.


8x2 Alphanumeric LCD with configurable Backlit option. 8 LEDs to indicate status of instrument

Control Action

Two independent alarm set points with latch and non-latch facility

User selectable Hysteresis and logic option

Configurable STEL and TWA set points for all VOCs(optional) in PPM level.


By using 3 keys on front panel for weatherproof model

By using magnetic pen for flame proof model

By using remote control for weatherproof/flameproof model (optional)

Auto ranging

From PPB to PPM



+2% of Full scale

Response time

T20<1 second

T50<4 second

T90<8 second

Start-up time

Less than 30 seconds


Supply Voltage

18 to 36 VDC, Typically 24 VDC

Power consumption

Less than 3.6 watts


3 wire (1.5mm2) flexible or armoured shielded cable

Weatherproof Housing

Protection lass


Cabinet material

Polycarbonate, grey colour

Cable entry

Thermoplastic cable gland (IP 68)


155mm (H) x 100mm (W) x 55mm(D)-(1 Glands)

155mm (H) x 120mm (W) x 55mm(D)-(2 Glands)


Wall mounting/Stand mounting/Pipe mounting


Approx. 500 Grams

Output Signal


4-20mA current output with configurable range selection


Two SPDT relays of rating 2A/120VAC, 2A/24VDC


RS-485 communication port with MODBUS RTU protocol

Error Monitoring

Sensor break/open

The display shows 'Sensor Open' and 4-20mA output goes down to 3.7mA

Over range

The display shows 'Over range' and 4-20mA output goes up to 21mA


Operating temperature

-20 to +60oC

Storage temperature

-30 to +70oC


Less than 95% Non-Condensing

Accessories (optional)

  • CE certified 24VDC power supply
  • Canopy and mounting stand
  • Gas calibration kit (0.5, 1,3,10) liter
  • Hooter cum Flasher
  • Remote control for programming
  • Gas sampling and conditioning system
  • RS-485 to USB or RS-232 convertor
  • PC based SCADA software, Modem

Flameproof Housing

Protection class

IP-66 for Gas. Gr. IIA, IIB and CMRI approved enclosure, CCOE(Optional)

Cabinet Material

Cast aluminium alloy, LM-6

Cable entry

Double compression cable gland (Ex-Proof), 3/4 ET-type


175mm (H) x 205mm (W) x 120mm (D) -(1 Glands)

175mm (H) x 250mm (W) x 120mm (D) -(2 Glands)


Wall Mounting/Stand Mounting/Pipe Mounting


Approx. 2.0 Kg