Evikon PluraSens E2648-PID User manual

RS485 communication interface
See Annex 1
Return to default settings
To reset the device’s Slave ID, baudrate and sbit number to factory settings, proceed as
follows:
1. De-energize the device 2. Connect the J3 jumper 3. Turn on the device
4. De-energize the device 5. Disconnect the J3 jumper 6. Turn on the device
Remote sensor probe handling
The E2648 series devices are available with remote probe (see drawing below for
dimensions). The remote probe is connected to the main unit with shielded cable.
Default connection cable length is 3 m. The sensor probes of all types are equipped with
a hydrophobic microporous PTFE filter to protect the sensor from dust, dirt and water
drops. The filter may be replaced if it gets strongly contaminated. To replace the PTFE
filter, unscrew the M25 nut and remove the old filter. Place a new filter into the nut
and tighten it again.
NB! Never stab or press the filter near its centre where the sensor is located since this
may damage the sensor.
The recommended orientation of sensor probe is vertical with the sensor tip pointing
downwards. This prevents possible accumulation of condensed water on the sensor
protection filter.
Volatile Organic Compounds
Highly volatile organic liquids. The definitions of VOC may vary depending on
application field and country.
See Annex 2 for more information on the properties of various gases.
E2648-PID is intended to detect compounds with ionisation potential <10.6 eV. It is
suitable for most part of commonly used solvents.
Ionisation potentials for a selection of organic compounds are listed in Annex 3.
Calibration and maintenance
For detailed instructions see Annex 4. Read them carefully before maintenance.
Do not perform any maintenance operation with the power on.
Clean the device with soft damp cloth. Do not use any abrasive cleaning agents. Do
not immerse the device into water or any cleaning media.
Warranty
This product is warranted to be free from defects in material and workmanship for a
period of one year from the date of original sale. During this warranty period
Manufacturer will, at its option, either repair or replace product that proves to be
defective. This warranty is void if the product has been operated in conditions outside
ranges specified by Manufacturer or damaged by customer error or negligence or if
there has been an unauthorised modification.
E2648-PID_UM_EN Rev 08.06.2020
Specifications
Detected gases
VOCs with ionisation potential < 10.6 eV (see Annex 3)
Sampling method
diffusion
Sensor type
photoionization detector
Calibration
isobutylene
E2648-PID-40
E2648-PID-200
Typical detection range
0...40 ppm (isobutylene)
0...200 ppm (isobutylene)
Resolution / digital unit
1 ppb
1 ppm
Response time T90
< 3 s
Sensor lifetime
5 years
Calibration interval
monthly or more frequently depending on operating
conditions
Signal update
every 1 second
Load resistance
RL< (Us - 2 V) / 22 mA for 4-20 mA
RL > 250 kOhm for 0-10 V mode
Digital interface
RS485, Modbus RTU protocol
no galvanic isolation
Power supply options
11...30 VDC, 24 VAC or 90...265 VAC
Power consumption
< 2 VA
Analog outputs
2 × 4-20 mA / 0-10 V, user settable
Relay outputs
2 × SPST, max 5 A, 30 VDC / 250 VAC
Outputs assignment
OUT1 2 gas; OUT2 2 gas
Outputs scale width
not below 10 × resolution
recommended: 20-100% of the detection range
Cable connections
screwless spring loaded terminals
Enclosure
die-cast aluminium, wall mount, protection class IP66
Dimensions
H120 × W125 × D58 mm
Operating conditions
-40...+65 °C (best stability in the range 0...+40°C);
< 95% RH non-condensing, 0,9...1,1 atm
explosion safe areas;
avoid strong mechanical shock, vibrations or EMI
CE marking
according to 2014/30/EU and EN61326-1 requirements
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm setpoints
determined by user
within 5-95% of the detection range
Other options
Remote probe
protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm
Evikon MCI OÜ Teaduspargi 7/9, Tartu [email protected]
Tel. [phone] Estonia www.evikon.eu
PluraSens®
VOC Detector-Transmitter
with Photoionization Sensor
E2648-PID
User Manual

Volatile organic compounds transmitter E2648-PID with photoionization detector is
intended for detection of organic vapors in very low concentrations.
The device belongs to the PluraSens® family of multifunctional measurement
instruments.
E2648 series provides two independent analog outputs OUT1 and OUT2, user-
selectable to 4-20 mA or 0-10 V, proportional either to gas concentration or temperature.
RS485 Modbus RTU digital communication interface allows easy instrument
configuration and integration into various automation systems.
The following features are available as option:
Two relays RE1 and RE2 with closing contacts. Relay outputs can be used to switch
alarm sirens, ventilation fans, shut-off valves or other actuators
Integrated 230 V mains power supply module
Remote probe.
The version of your device is marked on the package.
If symbol is marked on the equipment, consult the documentation for further
information.
PID technology
The gas under investigation diffuses into the sensor’s testing cell, equipped wit a
source of high energy UV light (10.6 eV Krypton lamp) and electrodes. Exposed to
UV light, organic molecules decompose to form ions, which are attracted by the
electrodes. The measured resulting current is proportional to the VOC
concentration.
Safety requirements
Misuse will impair the protection of the equipment.
Always adhere to the safety provisions applicable in the country of use.
Do not perform any maintenance operation with the power on. Do not let water or
foreign objects inside the device.
External circuits connected to the equipment should have sufficient insulation rating
according to the environmental conditions and equipment power
A disconnecting device that is marked as such and easily accessible should be
included in the installation of this product.
Operating conditions
The device should be used in explosion-safe areas at the temperature in the range
-40ºC to +65ºC, 15 to 95% RH without condensation and under ambient pressure
0,9...1,1 atm. Avoid strong mechanical shock, vibrations or EMI. Avoid corrosive
atmosphere and areas highly contaminated with dust, oil mist etc. Keep the device away
from direct sunlight.
Mounting dimensions
Installation and connections
Before proceeding with the installation it is mandatory to read carefully the Safety
requirements section and make sure to comply with all listed instructions. During the
installation of the detector the following points must be considered:
application (air quality control or leakage detection);
properties of the space under investigation (room geometry, direction and velocity of
air flows etc);
detected gas (relative density to air, temperature, whether the gas is flammable, or
toxiс, or oxygen displacing, whether the gas is heated);
the device should be accessible for maintenance and repair.
Solvent vapours are heavier than air and tend to sink. Do not take the gas samples for
investigation from too high.
The device is fixed on the wall using two holes located outside the sealed area of the
device(see dimensional drawing in the previous section).
Connections
1. Unscrew four lid screws and detach the lid from the device.
2. Attach the device to the wall. (This step may be done after the step 3, consider
your convenience).
3. Use two M16 cable glands to let in the cables of the power supply and of the external
devices. Without turning on the power, plug the power cable and connect the
analog/relay outputs and/or digital interface terminals to the necessary devices
according to the relevant connection diagram.
The screwless quick connect spring terminals on the E2648 series devices are
suitable for a wide range of wires with cross-section 0,2...1,5 mm2. We recommend
to strip the wire end by 8...9 mm and use the wire end sleeves.
To connect the wire, insert the wire end into terminal hole. To disconnect, push the
spring loaded terminal lever, pull the wire out, and release the lever.
Use twisted pair cable, e.g. LiYY TP 2×2×0,5 mm2or CAT 5, to connect the device
to RS485 network. Use one pair for A and B wires to connect the transmitter to
Fieldbus network. Respect polarity.
The type of each analog output can be independently changed between 4-20 mA
and 0-10 V with jumpers J1 (OUT1) and J2 (OUT2). With closed jumper the output
is 0-10 V, with open jumper the output is 4-20 mA. Power restart is required after
changing the position of the jumpers.
By default both outputs OUT1 and OUT2 are assigned to gas concentration. The
device has built-in temperature sensor which may be tied to any of the outputs. The
built-in temperature sensor is intended for temperature compensation. E2648 series
devices are not meant for ambient air temperature measurement.
We recommend to set the difference between the upper and bottom limits of the
output scale not narrower than 20% of detection range (for CO detectors the scales
down to 5% of range are allowed). In any case, do not set the output scale below
the tenfold resolution of the device.
NOTE The outputs are not galvanically isolated from 24 V power supply and share
common 0V. Allowed load resistance limits are stated in Specifications table. To power
the instrument from an external 24 VDC source, connect terminals 0V and +U to the
source. If the integrated mains power supply module is used, connect terminals Land N
to the mains.
NOTE Actuator short-circuits should be avoided, to protect the instrument relays
use external fuses or safety switches.
4. Turn on the power. The sensor heating up takes ca. 60 seconds after switching on.
The operating status is indicated by the LED on the PCB of the device. The LED
response to different processes is presented in the table below.
Process
LED mode
Sensor absence or malfunction
Blinking 0.5 Hz (90% off, 10% on)
Relay1 turned on
Blinking 1 Hz (50% on, 50% off)
Relay 2 turned on
Blinking 2 Hz (50% on, 50% off)
Modbus response
The signal is modulated with short on-off pulses,
even single Modbus cycle is traceable*
Normal operating
Continuous light
5. Make sure that the device is properly installed, the external devices connected,
power on and control LED is constantly lit. Make certain that the cable glands are
properly tightened to ensure the conformity to IP66 protection class. Place the lid
back and fix it with the screws. The device is ready to use.
Configuring
Detectors- transmitters E2648 share all functionalities of the PluraSens®multifunctional
platform. The features and options include:
- digital output change rate limiting filter
- digital integrating (averaging) filter
- temperature measurement channel with internal sensor
- free assignment of each analog output to chosen parameter
- flexible setting of analog output scales for each output
- output shift and slope adjustment for calibration
- free assignment of each of two relays to chosen parameter
- several relay control logic modes
- switch delays and minimum on/off state durations for each relay
A standard configuration kit includes a USB-RS485 converter and a software pack.
Please contact your Seller for more information.
E2648 version without relays
E2648R version with relays

E2648_UM_EN. Annex 1. E2648 series Modbus RTU Communication Reference
RS485 communication interface
Databits: 8
Parity: none / odd / even
Stop bits: 1 or 2
Protocol: Modbus RTU
Supported Modbus functions:
03 –read multiple registers
06 –write single register
Communication parameters
Parameter
Permitted values
Default
Supported
baudrates
1200, 2400, 4800, 9600, 19200,
38400, 57600
9600
Data bits
8
8
Parity
none / odd / even
none
Stop bits
1, 2
1
Protocol
Modbus RTU
Modbus functions
03 - read multiple registers
06 - write single register
Error codes
01 –illegal function
02 –illegal data address
03 –illegal data value
04 –slave device failure (details of last error 04
can be read from register 0x0008)
E2648 series Modbus holding registers
Register addresses are shown 0-based, Addr in hexadecimal, Reg in decimal format.
Modbus holding register numbers MHR are shown in decimal 1-based format, and may be addressed either from 00001 or 40001 base.
Addr
Reg / MHR
RW
Description
Supported values (dec)
Default
0x0001
1 / 40002
R
Hardware version
-
0x0002
2 / 40003
R
Software version
-
0x0003
3 / 40004
R
Product serial number
1...65535
-
0x0004
4 / 40005
RW
Slave ID (net address) *
1...247 **
1
0x0005
5 / 40006
RW
Baudrate *
1200, 2400, 4800, 9600, 19200, 38400, 57600
9600
0x0006
6 / 40007
RW
Response delay, ms
1...255
10
0x0007
7 / 40008
RW
Stop bits, parity bit *
1 –no parity bit, 1 stop bit (default after factory reset)
2 –no parity bit, 2 stop bits
3 –odd parity, 1 stop bit
4 –even parity, 1 stop bit
NOTE: 3 and 4 are available starting from the Software version 0x218 (dec. 536)
1
0x0008
8 / 40009
R
Last error code
1...255
-
0x0011
17 / 40018
RW
Restarts counter
write ‘42330’to restart device
-
* –The new value is applied after restart.
** –Broadcast slave ID 0 can be used to assign a new ID to device with unknown ID. When addressing by ID 0 the device shall be
the only Modbus instrument in the network. The device will not respond to Master command when addressed by ID 0.
*** –This value is dynamic and not kept in EEPROM after restart

E2648 series Modbus holding registers (part 2)
Register addresses are shown 0-based, Addr in hexadecimal, Reg in decimal format.
Modbus holding register numbers MHR are shown in decimal 1-based format, and may be addressed either from 00001 or 40001 base.
Addr
Reg / MHR
RW
Description
Supported values (dec)
Default
0x00A2
162 / 40163
RW
Zero adjustment for temperature data,
°C × 100
-32000...+32000 (-320,00...+320,00 °C)
0
0x00A5
165 / 40166
RW
Zero adjustment for gas data, ADC
-32000...+32000 ADC units
0
0x00A6
166 / 40167
RW
Slope adjustment for gas data
1...65535
512
0x00A7
167 / 40168
RW
Change rate limit for gas data,
gas unit / s
1...32000, 0 - no limit
0
0x00A8
168 / 40169
RW
Integrating filter time constant, s
1...32000 (seconds), 0 - no filter
0
0x00C9
201 / 40202
RW
Parameter tied to analog output 1
0 –none
1 –temperature
2 –gas concentration
9 –forced Modbus control, value set in MHR / 40204
2
0x00CA
202 / 40203
RW
Parameter tied to analog output 2
0 –none
1 –temperature
2 –gas concentration
9 –forced Modbus control, value set in MHR / 40205
2
0x00CB
203 / 40204
RW
Forced value for analog output 1***
0...1000 (0,0%...100,0% of output scale)
0
0x00CC
204 / 40205
RW
Forced value for analog output 2***
0...1000 (0,0%...100,0% of output scale)
0
0x00D3
211 / 40212
RW
Parameter tied to relay RE1
0 –none
1 –temperature
2 –gas concentration
9 –control by Modbus control, state set in MHR / 40214
2
0x00D4
212 / 40213
RW
Parameter tied to relay RE2
0-none
1 –temperature
2 –gas concentration
9 –control by Modbus control, state set in MHR / 40215
2
0x00D5
213 / 40214
RW
Forced state for relay RE1***
0 –off, 1 –on
0
0x00D6
214/ 40215
RW
Forced state for relay RE2***
0 –off, 1 –on
0
0x00D7
215 / 40216
RW
Switching delay for relay RE1
0...1000 (s)
0
0x00D8
216 / 40217
RW
Switching delay for relay RE2
0...1000 (s)
0
0x00D9
217 / 40218
RW
Minimal on/off time for relay RE1
0...1000 (s)
0
0x00DA
218 / 40219
RW
Minimal on/off time for relay RE2
0...1000 (s)
0
* –The new value is applied after restart.
** –Broadcast slave ID 0 can be used to assign a new ID to device with unknown ID. When addressing by ID 0 the device shall be
the only Modbus instrument in the network. The device will not respond to Master command when addressed by ID 0.
*** –This value is dynamic and not kept in EEPROM after restart

E2648 series Modbus holding registers (part 3)
Register addresses are shown 0-based, Addr in hexadecimal, Reg in decimal format.
Modbus holding register numbers MHR are shown in decimal 1-based format, and may be addressed either from 00001 or 40001 base.
Addr
Reg / MHR
RW
Description
Supported values (dec)
Default
0x00DB
219 / 40220
RW
Control logic for relay RE1
0 –none
1 –relay on at high values
2 –relay on at low values
3 –relay on at values within the range
4 –relay on for the values out of the range
0
0x00DC
220 / 40221
RW
Control logic for relay RE2
0 –none
1 –relay on at high values
2 –relay on at low values
3 –relay on at values within the range
4 –relay on for the values out of the range
0
0x00DD
221 / 40222
RW
LOW setpoint for relay RE1
0...65535 (gas units)
see
Specifications
0x00DE
222 / 40223
RW
HIGH setpoint for relay RE1
0...65535 (gas units)
see
Specifications
0x00DF
223 / 40224
RW
LOW setpoint for relay RE2
0...65535 (gas units)
see
Specifications
0x00E0
224 / 40225
RW
HIGH setpoint for relay RE2
0...65535 (gas units)
see
Specifications
0x00FF
255 / 40256
RW
Sensor, analog outputs, LED and buzzer
status
bit[0]=0/1 –sensor present/absent, read-only!
bit[1]=0/1 –analog outputs deactivated/activated,
bit[2]= 0/1 –in case the sensor is absent, turn signaling off/on analog output1,
bit[3]=0/1 –in case the sensor is absent, turn on signaling with low current/high
current on analog output1; if bit[2]==0 this bit will be ignored,
bit[4]=0/1 –in case of sensor absent, turn signaling off/on analog output2
bit[5]=0/1 –in case of sensor absent, turn on signaling with low current/high current on
analog output2; if bit[4]==0 this bit will be ignored,
bit[6]=0/1 –current/voltage output detected on output1, read-only!
bit[7]=0/1 –current/voltage output detected on output2, read-only!
bit[8]=0/1 –LED deactivated/activated,
bit[9]=0/1 –buzzer deactivated/activated
bit[10]=0/1 –LED is on/off in normal condition
bit[11]=0/1 –LED and buzzer syncing off/on with RE1
bit[12]=0/1 –LED and buzzer syncing off/on with RE2
user defined
0x0101
257 / 40258
R
Raw gas sensor data
ADC data 0...4095
0x0102
258 / 40259
R
Measured temperature, °C×100
signed integer, -4000...+12500 (-40,00...+125,00 °C)
0x0103
259 / 40260
R
Gas concentration, gas units
signed integer, -32000...+32000 (gas units)
0x0105
261 / 40262
RW
0% value for analog output 1
-32000...+32000 (gas unit/°C)
user defined
0x0106
262 / 40263
RW
100% value for analog output 1
-32000...+32000 (gas unit/°C)
user defined
0x0107
263 / 40264
RW
0% value for analog output 2
-32000...+32000 (gas unit/°C)
user defined
0x0108
264 / 40265
RW
100% value for analog output 2
-32000...+32000 (gas unit/°C)
user defined
* –The new value is applied after restart.
** –Broadcast slave ID 0 can be used to assign a new ID to device with unknown ID. When addressing by ID 0 the device shall be
the only Modbus instrument in the network. The device will not respond to Master command when addressed by ID 0.
*** –This value is dynamic and not kept in EEPROM after restart
NOTE 1 Relay setpoints should be set within 5-95% of the detection
range.
NOTE 2 Sensor absense signalling (bits from [2] to [5]) is available only for
sensors with digital interface ( e.g.-CO2 10K, -O2-L).
NOTE 3 LED/buzzer signalization (if activated):
Detectable sensor
absence or malfunction
0.5Hz (90% off, 10% on) light and/or sound
signal
Relay1 turned on
1 Hz (50% on, 50% off) light and/or sound
signal, depending on bit[8], bit[9] and bit[11]
Relay2 turned on
2 Hz (50% on, 50% off) light and/or sound
signal, depending on bit[8], bit[9] and bit[12]
Modbus response
the light signal is modulated with short on-off
pulses, even single Modbus cycle is visible
Normal operating
continuously on/off depending on bit[10]
NOTE 4 We recommend to set the difference between the upper and
bottom limits of the output scale not narrower than 20% of detection
range (for CO detectors the scales down to 5% of range are
allowed). In any case, do not set the output scale below the tenfold
resolution of the device.

E2648-PID User Manual
Annex 2 Properties of selected VOC
Acetone
Synonyms/Trade Names: Dimethyl ketone, Ketone propane, 2-Propanone
Chemical formula (CH3)2CO
Molar weight 58
Relative gas density (to air) 2.0
Conversion* 1 ppm = 2.38 mg/m3
Boiling point 56.11 °C
Low explosive limit (LEL), % vol. in air 2.5
Upper explosive limit (UEL), % vol. in air 12.8
Odour Characteristic pungent smell
Hazards Highly flammable.
Slightly toxic in normal use. Irritant
causing mild skin irritation and
moderate to severe eye irritation.
At high vapour concentrations, it
may depress the CNS.
Exposure limits 8 hours
(2000/39/EC) 1900 mg/m3/ 500 ppm
NIOSH REL TWA 590 mg/m3/250 ppm
IDLH (NIOSH) 2500 ppm [10%LEL]
Benzene
Synonyms/Trade Names: Benzol, Phenyl hydride
Chemical formula
C6H6
Molar weight 78
Relative gas density (to air) 2.69
Conversion* 1 ppm = 3.19 mg/m3
Boiling point 80 °C
Low explosive limit (LEL), % vol. in air 1.2
Upper explosive limit (UEL), % vol. in air 7.8
Odour Hyacinth-like odour
Hazards Highly flammable.
Irritant. Carcinogen.
May cause dizziness; headache,
nausea, staggered gait; anorexia,
lassitude .
Target organs: eyes, skin,
respiratory system, blood, central
nervous system, bone marrow.
Exposure limits
(NIOSH REL)
Ca TWA
0.319 mg/m3/0.1 ppm
STEL
15 minutes
1 ppm
Ca IDLH
500 ppm
Ethanol
Chemical formula
CH3CH2OH
Molar weight
46
Relative gas density (to air)
1,59
Conversion*
1 ppm = 1.89 mg/m3
Boiling point
78.37°C
Low explosive limit (LEL), % vol. in air
3 - 3.3
Upper explosive limit (UEL), % vol. in air
19
Odour
Characteristic smell of alcohol
Hazards
Highly flammable.
Gas/air mixtures are explosive.
Inhalation of vapours leads to
cough, headache, fatigue and
drowsiness. High concentrations
may damage the fetus. Repeated
high exposure may affect the liver
and the nervous system.
Exposure limits according
to Commission Directive
2006/15/EC
TWA
8 hours
1210 mg/m3/ 1000 ppm
STEL
15 minutes
-
Ethyl acetate
Chemical formula
Molar weight
88
Conversion*
1 ppm = 3.60 mg/m3
Boiling point
77.1 °C
Low explosive limit (LEL), % vol. in air
2
Upper explosive limit (UEL), % vol. in air
11.5
Odour
Sweet “pear”smell
Hazards
Flammable.
Short-term exposure to high levels
of ethyl acetate results first in
irritation of the eyes, nose and
throat, followed by headache,
nausea, vomiting, sleepiness, and
unconsciousness.
Exposure limits (NIOSH)
TWA
8 hours
1400 mg/m3/400 ppm
IDLH
2000 ppm [10%LEL]
Toluene
Chemical formula
C6H5CH3
Molar weight
92
Conversion*
1 ppm = 3.77 mg/m3
Boiling point
110.7°C
Low explosive limit (LEL), % vol. in air
1.1 - 1.27
Upper explosive limit (UEL), % vol. in air
6.75–7.1
Odour
Characteristic “chemical”smell
Hazards
Highly flammable.
Gas/air mixtures are explosive.
Inhalation possible effects:
irritation eyes, nose; lassitude
(weakness, exhaustion),
confusion, euphoria, dizziness,
headache; dilated pupils,
lacrimation (discharge of tears);
anxiety, muscle fatigue, insomnia;
paraesthesia; dermatitis; liver,
kidney damage
Exposure limits according
to Commission Directive
TWA
192 mg/mm3/ 50 ppm
STEL
384 mg/mm3 / 100 ppm
Xylene
(the term is used for any one of three isomers of dimethylbenzene, or a combination thereof)
Chemical formula
C6H4(CH3)2
Isomers
ortho-xylene meta-xylene para-xylene
Molar weight
106
Conversion*
1 ppm = 4.34 mg/m3
Boiling point
144.4 °C
139 °C
138.35 °C
Low explosive limit (LEL), % vol. in air
0.9 - 1.1
Upper explosive limit (UEL), % vol. in
6.0–7.0
Odour
Characteristic “chemical”smell
Hazards
Flammable.
Inhaling can cause dizziness,
headache, drowsiness, and
nausea.
Exposure limits according
to Commission Directive
2000/39/EC
TWA
8 hours
221 mg/mm3/ 50 ppm
STEL
15 minutes
442 mg/mm3/ 100 ppm
Terms and abbreviations
TWA: time-weighted average concentration for up to a 8-hour workday during a 40-hour workweek. Any substance that NIOSH considers to be a potential occupational carcinogen is designated by the notation "Ca".
STEL: 15-minute TWA exposure that should not be exceeded at any time during a workday
IDLH (immediately dangerous to life or health): likely to cause death or immediate or delayed permanent adverse health effects or prevent escape from such an environment.
REL recommended exposure limits.
NIOSH (National Institute for Occupational Safety and Health): the US federal agency responsible for conducting research and making recommendations for the prevention of work-related injury and illness. NIOSH data are quoted if EU regulations are nor available.
*Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.

E2648-PID User Manual
Annex 3 Properties of VOC: ioni ation energy, correction factor
Sensors used in E2648-PID are calibrated using iosbutylene, but the PID is a broadband VOC detector, ith a sensitivity that differs for each VOC. If you kno hat VOC you are measuring, then the table belo ill allo you to calculate the
concentration for your specific VOC. NB These are approximate values, so for best accuracy you should calibrate ith the relevant VOC.
Only the most common substances are listed in the table, if you can’t find your compound of concern, please contact us.
The table includes follo ing columns:
1 The most common name for the VOC or or other substance. I
2. CAS No. You can find the VOC using the CAS No.
3. Brutto-formula.
4. Ioni ation energy (IE), eV
5 Relative Response/ Correction Factor (CF) Also called the Response Factor (RF). Multiply the displayed concentration by the Relative Response/ CF/ RF to calculate the actual concentration of the VOC.
6 Minimum Detection Level (MDL) Also called Minimum Detectable Quantity (MDQ). Typical lo est concentration that can be detected. The sensor used in E2648-PID-40 has greater sensitivity than that in E2648-PID-200, so the MDL for the
E2648-PID-40 ill be much less than the MDL for the E2648-PID-200.
The Relative Response/ CF/ RF is measured in dry air; high humidity ill reduce this factor by 30% to 50%, so the CF/RF should be increased in high humidities.
Relative sensitivity is the inverse of the correction factor, specifying the percent response of the VOC, relative to isobutylene. If less than 100%, then the VOC is less responsive than isobutylene; if the relative sensitivity is greater than 100%, then the
VOC is more responsive than isobutylene. Relative sensitivity (%) is specified the same ay as cross-sensitivity for toxic gas sensors.
VOC response
The PID can not measure all VOCs or gases: t o types of VOCs are not measured:
NR: No response. The lamp does not ionise the VOC and the VOC cannot be measured.
NV: The vapour pressure of the VOC at 20°C is less than a fe ppm, so this Semi-Volatile Organic Compound (SVOC) cannot be measured.
NA: Not available
Occasionally you ill be measuring a mixture of VOCs. If the total concentration is ithin the linear range of your PID, then it is reasonable to assume that the concentrations are additive ithout interference bet een the different VOCs.
Remember that if you are measuring a combination of VOCs, then accurate measurement of one of these VOCs ill be difficult; ithout careful data analysis, you ill get only a CF averaged measurement. Be cautious hen reporting actual VOC
concentration if you kno that there may be several VOCs present.
Balance gas
The relative response is measured in laboratory air, ith 20.9% oxygen, balance nitrogen. Some gases absorb UV light ithout causing any PID response (e.g. methane, ethane). In ambient atmospheres here these gases are present, the measured
concentration of target gas ill be less than is actually present. Methane absorbs UV strongly, so for accurate measurements in methane containing atmospheres, calibrate ith a calibration gas containing the expected methane concentration. 50% LEL
methane reduces the reading by up to 50%. Gases such as nitrogen and helium do not absorb UV and do not affect the relative response.
The correction factor for a gas mix containing PID detectable gases A, B, C… ith response factors RF(A), RF(B), RF(C), in relative proportions a: b: c… is given by:
CF(mix) = 1 / [(a/CF(A) + b/CF(B) + c/CF(C)…]
Accuracy of the Table
This table is for indication only. Table accuracy is 1 to 2 digits only, so hen calculating concentration for a specific VOC, specify to 1 or 2 digits only.
Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response Factor (RF)
10.6 eV
E2648-PID-40
(ppb)
E2648-PID-200
(ppb)
1
Acetaldehyde
C2H4O
75-07-0
10.23
5.5
25
480
2
Acetamide
C2H5NO
60-35-5
9.69
2
3
Acetic acid
C2H4O2
64-19-7
10.66
28
180
3615
4
Acetic anhydride
C4H6O3
108-24-7
10.14
4
20
400
5
Acetone
2-propanone, dimethyl ketone
C3H6O
67-64-1
9.69
1.17
5
70
6
Acetonitrile
CH3CN
75-05-8
12.2
NR
7
Acetophenone
1-phenylethan-1-one, methyl phenyl ketone
C8H8O
98-86-2
9.29
0.6
9
Acetylene
ethyne
C2H2
74-86-2
11.4
NR
10
Acrolein
propenal
C3H4O
107-02-8
10.22
3.2
20
400
11
Acrylic Acid
propenoic acid
C3H4O2
79-10-7
10.6
21
15
275

Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response Factor (RF)
10.6 eV
E2648-PID-40
(ppb)
E2648-PID-200
(ppb)
12
Acrylonitrile
C3H3N
107-13-1
10.91
NR
13
Alkanes, n-, C6+
CnH2n+2
N/A
~10
1.2
15
Allyl alcohol
C3H6O
107-18-6
9.63
2.3
10
200
16
Allyl bromide
3-bromopropene
C3H5Br
106-95-6
9.96
3
17
Allyl chloride
3-chloropropene
C3H5Cl
107-05-1
10.05
4.5
20
450
18
Ammonia
NH3
7664-41-7
10.18
8.5
40
850
19
Amyl acetate
C7H14O2
628-63-7
9.9
1.8
10
180
20
Amyl alcohol
C5H12O
71-41-0
10
2.6
15
320
21
Amyl alcohol,tert-
C5H12O
75-85-4
9.8
1.5
22
Aniline
C6H7N
62-53-3
7.7
0.5
3
50
23
Anisole
C7H8O
100-66-3
8.21
0.59
2
50
24
Arsine
AsH3
7784-42-1
9.89
2.5
15
250
25
Asphalt, petroleum fumes
8052-42-4
~9
1
5
100
26
Benzaldehyde
C7H6O
100-52-7
9.49
0.7
5
85
27
Benzene
C6H6
71-43-2
9.24
0.5
3
50
28
Benzoic acid
C7H6O2
65-85-0
9.3
0.7
29
Benzyl acetate
C9H10O2
140-11-4
~9
0.6
30
Benzyl alcohol
C7H8O
100-51-6
8.26
1
6
125
31
Camphor
C10H16O
76-22-2
8.76
0.4
32
Carbon dioxide
CO2
124-38-9
13.77
NR
0
0
33
Carbon disulfide
CS2
75-15-0
10.08
1.4
7
140
34
Carbon monoxide
CO
630-08-0
14.01
NR
0
0
35
Carbon tetrabromide
tetrabromomethane
CBr4
558-13-4
10.31
3
15
300
36
Carbon tetrachloride
R-10, tetrachloromethane
CCl4
56-23-5
11.47
NR
37
Chloroform
CHCl3
67-66-3
11.42
NR
38
Acetaldehyde
C14H26O2
97-89-2
~9
0.9
39
Coumarin
C9H6O2
91-64-5
~9
0.4
40
Creosote
n/a
8021-39-4
~9
1
41
Cresol, m-
3-methylphenol
C7H8O
108-39-4
8.36
2.2
5
105
42
Cresol, o-
2-methylphenol
C7H8O
95-48-7
8.14
1.1
5
105
43
Cresol, p-
4-methylphenol
C7H8O
106-44-5
8.31
1.1
5
105
44
Cycloalkanes
N/A
N/A
~10
1.5
45
Cyclobutene
C4H6
822-35-5
9.43
3
46
Cycloheptane
C7H14
291-64-5
9.82
1.1
47
Cyclohexane
C6H12
110-82-7
9.98
1.3
7
130
48
Cyclohexanethiol
C6H12S
1569-69-3
~9
0.5
49
Cyclohexanol
C6H12O
108-93-0
10
1.6
15
300
50
Cyclohexene
C6H10
110-83-8
8.95
0.9
5
75
51
Cyclopentadiene
C5H6
542-92-7
8.56
0.8

Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response Factor (RF)
10.6 eV
E2648-PID-40
(ppb)
E2648-PID-200
(ppb)
52
Cyclopentane
C5H10
287-92-3
10.52
10
20
400
53
Cyclopentene
C5H8
142-29-0
9.01
1.5
54
Decane, n-
C10H22
124-18-5
9.65
1.2
5
100
55
Decanol
C10H22O
112-30-1
1.2
56
Diethyl ether
ethyl ether
C4H10O
60-29-7
9.53
1.1
4
90
57
Diethylamine
C4H11N
109-89-7
8.01
1.4
5
100
58
Diesel fuel
68334-30-5
8
0.8
4
75
59
Dimethylamine
C2H7N
124-40-3
8.24
1.5
7
140
60
Diphenyl ether
phenyl ether
C12H10O
101-84-8
8.09
1.5
4
80
61
Dodecane
C12H24
112-40-3
~8.8
1
62
Dodecanol
C12H26O
112-53-8
0.9
5
90
63
Ethane
C2H6
74-84-0
11.56
NR
64
Ethanol
alcohol,ethyl alcohol
C2H6O
64-17-5
10.43
11
45
870
65
Ethyl acetate
C4H8O2
141-78-6
10.01
4.5
20
360
66
Ethyl acrylate
C5H8O2
140-88-5
10.3
2.3
10
200
67
Ethyl benzoate
C9H10O2
93-89-0
8.9
0.9
68
Ethyl butyrate
C6H12O2
105-54-4
~9.9
1.4
5
100
69
Ethylamine
C2H7N
75-04-7
8.86
1
5
100
70
Ethylbenzene
C8H10
100-41-4
8.76
0.56
3
50
71
Ethylcyclohexane
C8H16
1678-91-7
9.54
0.8
72
Ethylene
ethene
C2H4
74-85-1
10.51
8
40
800
73
Ethylene glycol
C2H6O2
107-21-1
10.16
9
100
2000
74
Ethylamine
C2H7N
75-04-7
8.86
1
5
100
75
Formaldehyde
CH2O
50-00-0
10.87
NR
76
Formamide
CH3ON
75-12-7
10.2
2
10
200
77
Formic acid
CH2O2
64-18-6
11.05
NR
78
Furan
C4H4O
110-00-9
8.88
0.4
79
Hexanoic acid
C6H12O2
142-62-1
10.12
4
80
Hexanol
C6H14O
111-27-3
9.89
2
81
Hexene, 1-
C6H12
592-41-6
9.44
0.98
5
90
82
Hydrazine
H4N2
302-01-2
8.93
3
15
300
83
Hydrazoic acid
HN3
7782-79-8
10.72
NR
84
Hydrogen
H2
1333-74-0
15.43
NR
85
Hydrogen bromide
HBr
10035-10-6
11.62
NR
86
Hydrogen chloride
HCl
7647-01-0
12.74
NR
87
Hydrogen cyanide
HCN
74-90-8
13.6
NR
88
Hydrogen fluoride
HF
7664-39-3
15.98
NR
89
Hydrogen iodide
HI
10034-85-2
10.39
5
90
Hydrogen peroxide
H2O2
7722-84-1
10.58
4
20
400

Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response Factor (RF)
10.6 eV
E2648-PID-40
(ppb)
E2648-PID-200
(ppb)
126
Hydrogen selenide
H2Se
7783-07-5
9.88
2
127
Hydrogen sulfide
H2S
7783-06-4
10.46
4
128
Hydroquinone
C6H6O2
123-31-9
7.94
0.8
4
80
129
Isooctane
2,2,4-trimethylpentane
C8H18
540-84-1
9.86
1.1
5
100
130
Isooctanol
C8H18O
26952-21-6
~9.8
1.7
9
170
131
Isopentane
C5H12
78-78-4
10.32
4
30
600
132
Isopentanol
C5H12O
137-32-6
9.86
2
133
Isopentene
C5H10
563-46-2
9.12
0.8
134
Iodoform
triiodomethane
CHI3
75-47-8
9.25
1.5
8
150
135
Iodomethane
methyl iodide
CH3I
74-88-4
9.54
0.4
2
40
136
Isoalkanes, C10-C13
C8H18O
68551-17-7
~9.6
1
137
Isobutane
C4H10
75-28-5
10.57
8
40
800
138
Isobutanol
C4H10O
78-83-1
10.12
3
20
350
139
Isobutyl acetate
C6H12O2
110-19-0
9.9
2
10
230
140
Isobutyl acrylate
C7H12O2
106-63-8
~9.5
1.2
7
130
141
Isooctane
2,2,4-trimethylpentane
C8H18
540-84-1
9.86
1.1
5
100
142
Isooctanol
C8H18O
26952-21-6
~9.8
1.7
9
170
143
Isopentane
C5H12
78-78-4
10.32
4
30
600
144
Isopentanol
C5H12O
137-32-6
9.86
2
145
Isopentene
C5H10
563-46-2
9.12
0.8
146
Isoprene
2-methyl-1,3-butadiene
C5H8
78-79-5
8.85
0.8
3
70
147
Isopropanol
IPA, 2-propanol
C3H8O
67-63-0
10.17
4
22
440
148
Isovaleraldehyde
C5H10O
590-86-3
9.72
1.3
149
Isovaleric Acid
C5H10O2
503-74-2
~10.2
5.5
150
Methane
natural gas
CH4
74-82-8
12.51
NR
151
Methanol
CH4O
67-56-1
10.85
NR
1000
20000
152
Methyl ethyl ketone
MEK, Butan-2-one
C4H8O
78-93-3
9.51
0.96
4
80
153
Methyl ethyl ketone peroxides
MEKP
C8H18O6
1338-23-4
~9
0.8
4
80
154
Methyl formate
C2H4O2
107-31-3
10.82
NR
155
Methyl mercaptan
CH4S
74-93-1
9.44
0.7
4
70
156
Methylamine
CH5N
74-89-5
8.97
1.5
7
140
157
Mineral oil
8042-47-5
~9
0.8
4
80
158
Mineral spirits
Stoddard solvent, Varsol,Viscor
64475-85-0
~9
0.8
4
80
159
Naphthalene
C10H8
91-20-3
8.14
0.4
2
45
160
Neopentane
tetramethylmethane
C5H12
207-343-7
10.21
3
161
Neopentyl alcohol
C5H12O
75-84-3
9.72
2
162
Nitric oxide
NO
10102-43-9
9.27
8
40
800
163
Nitrobenzene
C6H5NO2
98-95-3
9.92
1.7
10
170
164
Nitroethane
C2H5NO2
79-24-3
10.88
NR

Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response Factor (RF)
10.6 eV
E2648-PID-40
(ppb)
E2648-PID-200
(ppb)
165
Nitrogen trichloride
NCl3
10025-85-1
10.1
1
5
100
166
Nitrogen
N2
7727-37-9
15.58
NR
167
Nitrogen dioxide
NO2
10102-44-0
9.58
10
50
1000
168
Nitrogen trifluoride
NF3
7783-54-2
12.97
NR
169
Nitromethane
CH3NO2
75-52-5
11.08
NR
170
Nitropropane, 1-
C3H7NO2
108-03-2
10.81
NR
171
Nitropropane, 2-
C3H7NO2
79-46-9
10.71
NR
172
Nitrous oxide
N2O
10024-97-2
12.89
NR
173
Nonane
C9H20
111-84-2
9.72
1.4
6
130
174
Nonanol (mixed isomers)
C9H20O
143-08-8
~9.8
1.2
175
Nonene (mixed isomers)
C9H18
27215-95-8
~9.3
0.6
176
Nonene, 1-
C9H18
124-11-8
~9.4
0.6
177
Octane
C8H18
111-65-9
9.8
1.6
8
160
178
Octanol (mixed isomers)
capryl alcohol, octyl alcohol
C8H18O
111-87-5
~9.8
1.5
179
Octene (mixed isomers)
C8H16
25377-83-7
~9.4
0.7
180
Octene, 1-
C8H16
111-66-0
9.43
0.7
3
70
181
Oxalic acid
C2H2O4
144-62-7
11.2
NR
182
Oxalyl bromide
C2Br2O2
15219-34-8
10.49
5
183
Oxydiethanol, 2,2-
diethylene glycol
C4H10O3
111-46-6
~10.3
2
20
400
184
Oxygen
O2
7782-44-7
12.07
NR
185
Ozone
O3
10028-15-6
12.52
NR
186
Paraffins, normal
64771-72-8
~9.5
1
5
100
187
Paraldehyde
C6H12O3
123-63-7
~9.7
2.2
188
Pentane
C5H12
109-66-0
10.35
7
40
800
189
Pentanoic acid
C5H10O2
109-52-4
10.53
8
190
Pentanol, 2-
C5H12O
6032-29-7
9.78
2
191
Pentanol, 3-
C5H12O
584-02-1
9.76
1.7
192
Pentene, 1-
C5H10
109-67-1
9.49
0.92
193
Pentyne, 1-
C5H8
627-19-0
10.1
3
194
Peracetic acid
C2H4O3
79-21-0
~10.5
2
10
200
195
Petroleum ether
ligroin, VM&P naphtha, benzine
8032-32-4
~10
0.9
196
Phenol
hydroxybenzene
C6H6O
108-95-2
8.51
1.2
6
120
197
Phosgene
COCl2
75-44-5
11.55
NR
198
Phosphine
PH3
7803-51-2
9.96
2
10
200
199
Propane-1,2-diol
propylene glycol
C3H8O2
57-55-6
10
3
50
1000
200
Acetaldehyde
C3H9NO
156-87-6
~9.5
1.5
201
Propene
propylene
C3H6
115-07-1
9.73
1.4
7
140
202
Propiolic acid
2-propynoic acid
C3H2O2
471-25-0
10.45
8
203
Propionaldehyde
propanal, propional
C3H6O
123-38-6
9.95
1.7
8
169

Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response Factor (RF)
10.6 eV
E2648-PID-40
(ppb)
E2648-PID-200
(ppb)
204
Propionic acid
C3H6O2
79-09-4
10.44
8
40
800
205
Propyl acetate, n-
C5H10O2
109-60-4
10.04
3
13
250
206
Propyl iodide
Iodopropane
C3H7I
107-08-4
9.26
1
207
Propylamine, n-
C3H9N
107-10-8
8.5
1.1
208
Propylbenzene (all isomers)
C9H12
74296-31-4
8.7
0.5
209
Propylene carbonate
C4H6O3
108-32-7
~10.5
15
210
Propylene dinitrate
C3H6N2O6
6423-43-4
~11
NR
211
Propylene glycol ethyl ether acetate
PGEEA
C7H14O3
98516-30-4
~9.6
1.2
212
Propylene oxide
C3H6O
75-56-9
10.22
6
35
700
213
Propyleneimine
2-methylaziridine
C3H7N
75-55-8
9
1.4
7
130
214
Propylnitrate, n-
C3H7NO3
627-13-4
11.07
NR
215
Propyne
methylacetylene
C3H4
74-99-7
10.36
4
216
Pyrazine
C4H4N2
290-37-9
9.29
3
217
Pyridine
C5H5N
110-86-1
9.25
0.7
4
75
218
Pyrrole
C4H5N
109-97-7
8.02
0.6
219
Pyrrolidine
C4H9N
123-75-1
8.77
4
220
Pyruvaldehyde
C3H4O2
78-98-8
9.6
0.7
221
Rose oxide, cis-
Tetrahydro-4-methyl-2-(2-methylpropenyl)-2H-pyran
C10H18O
16409-43-1
~9
0.8
222
Sec-amyl acetate
C7H14O2
626-38-0
~9.9
5
223
Sevoflurane
1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane
C3H3F7O
28523-86-6
11
NR
224
Styrene
vinylbenzene
C8H8
100-42-5
8.4
0.45
2
50
225
Tetrafluoroethylene
R-1114
C2F4
116-14-3
10.12
15
5
100
226
Tetrafluoromethane
carbon tetrafluoride
CF4
75-73-0
15.3
NR
227
Tetrahydrofuran
THF
C4H8O
109-99-9
9.41
2.3
8
150
228
Toluene
C7H8
108-88-3
8.82
0.56
3
50
229
Triethylamine
TEA
C6H15N
121-44-8
7.5
1.3
5
90
230
Trifluoroacetic acid
TFAA
C2HO2F3
76-05-1
11.46
NR
231
Trifluoroethene
trifluoroethylene
C2HF3
359-11-5
10.14
5
232
Turpentine
C10H16
9005-90-7
~8.5
0.6
233
Turpentine oil
pinenes
C10H16
8006-64-2
~8
0.6
3
60
234
Undecane
C11H24
1120-21-4
9.56
1.1
5
100
235
Vanillin
C8H8O3
121-33-5
~9
1
236
Water
dihydrogen monoxide
H2O
7732-18-5
12.61
NR
237
Xenon
Xe
7440-63-3
12.13
NR
238
Xylene mixed isomers
dimethylbenzenes
C8H10
1330-20-7
8.56
0.54
2
40
239
Xylene, m-
C8H10
108-38-3
8.56
0.5
2
50
240
Xylene, o-
C8H10
95-47-6
8.56
0.5
3
60
241
Xylene, p-
C8H10
106-42-3
8.44
0.55
3
50

E2648-PID User Manual
Annex 4 Calibration and maintenance
Do not perform any maintenance operation with the power on.
Clean the device with soft damp cloth. Do not use any abrasive cleaning agents. Do
not immerse the device into water or any cleaning media.
N TE Cleaning instruments and spare parts are not included to the delivery set,
please contact your Seller for more information.
How often the PID needs maintenance
The frequency of calibration and maintenance depends on operating conditions
(V C concentration, humidity, dust and oil in the air etc).
In clean indoor air with low V C concentration a monthly or less frequent
calibration is recommended. When higher V C concentrations are measured under
harsh conditions, perform calibration and maintenance more frequently.
The PID needs maintenance:
If the baseline is climbing after you zero the PID – replace electrode stack
If the PID becomes sensitive to humidity – replace electrode stack
If the PID cell shows signs of contamination after the lamp window has been
cleaned – replace electrode stack
If the PID cell is known to have been subjected to severe contamination– replace
electrode stack
If the baseline is unstable or shifts when you move the PID – replace electrode
stack
If sensitivity has dropped too much (note the change required when checking
calibration) – clean the lamp
if the signal to noise ratio at low V C concentrations becomes inadequate –
replace the lamp
Cleaning of the PID lamp is recommended as the first action when a PID needs
maintenance. It is recommended to recalibrate the device every time after stack
replacement or lamp cleaning.
Removing the electrode stack and lamp
Always use the Electrode Stack Removal Tool to remove the electrode
stack; any other tools may damage your PID and invalidate your warranty.
To remove the electrode stack, proceed as follows:
1. Gently remove the sensor from equipment.
2. Place the PID, pellet side down, onto a clean surface.
3. Locate electrode stack removal tool into the two slots on the sides of the PID and
squeeze together until electrode stack and lamp are released.
4. Carefully lift the PID body away from the pellet and lamp.
5. ccasionally the lamp may be temporarily lodged in the cell and will need to be
freed carefully with tweezers.
6. ccasionally the small spring behind the lamp will come out when the lamp is
removed from the sensor. Simply replace it into the sensor house.
Cleaning the PID Lamp
Always use recommended cleaning kit to clean the lamp.
Inspection of the lamp may reveal a layer of contamination on the detection window
that presents itself as a 'blue hue.' To check for contamination, hold the lamp in
front of a light source and look across the window surface To avoid contaminating
the sensor and affecting accuracy, do not touch the lamp window with bare fingers.
You may touch the body of the lamp with clean fingers.
PID lamp cleaning kit
The vial of cleaning compound contains alumina (CAS Number 1344-28-1) as a
very fine powder. Please contact your Seller for full material safety data sheet
MSDS.
Key safety issues are identified below:
Hazard identification: May cause irritation of respiratory tract and eyes
Storage: Keep container closed to prevent water adsorption and contamination
Handling:
• Do not breathe in the powder. Avoid contact with skin, eyes and clothing
• Wear suitable protective clothing
• Follow industrial hygiene practices: Wash face and hands thoroughly with soap
and water after use and before eating, drinking, smoking or applying cosmetics
• The powder carries a TVL(TWA) limit of 10 mg/m3
PID lamp cleaning kit
1. pen the container of alumina polishing compound.
2. With a clean cotton bud, collect a small amount of the powder.
3. Use this cotton bud to polish the PID lamp window. Use a circular action,
applying light pressure to clean the lamp window. Do not touch the lamp window
with fingers.
4. Continue polishing until an audible “squeaking” is made by the cotton bud
moving over the window surface. (usually within 15 seconds)
5. Remove the residual powder from the lamp window with a clean cotton bud. Care
must be taken not to touch the tips of cotton buds that are to be used to clean the
lamps as this may contaminate them with finger oil.
6. Ensure the lamp is completely dry and remove any visible signs of contamination
before refitting.
Re-fitting the PID electrode stack and lamp
WARNING: Never refit a damaged lamp.
1. Place the lamp inside the -ring seal in the pellet as illustrated below.
Twisting the lamp slightly during insertion will help to ensure the lamp window is
snug against the electrode stack’s front electrode. The lamp should be freely
supported by the -ring.
2. Continuing to hold the electrode stack between forefinger and thumb, carefully
insert the lamp into recess in the sensor ensuring that the lamp remains in position.
Press the electrode stack firmly, to ensure that the electrode stack wing clips are
engaged, and the top faces of the electrode stack and sensor house are flush.
3. Refit the sensor into the sensing equipment.
4. Recalibrate the gas detector.
Discarding the PID electrode stack
The electrode stack does not have any toxic components, however, if it has been
contaminated by toxic materials, show due care when disposing.
Feel free to contact us if you have questions.
Electrode stack
Electrode stack removing tool