Itsensor E2638-co Carbon Monoxide Detector-transmitter User Manual (+ PDF)

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Carbon Monoxide Detector-Transmitter
E2638-CO
User Manual

Contents hide

1 Carbon Monoxide

2 Speciﬁcations

3 Product description

4 Operating conditions

5 Installation guidelines

6 Mounting dimensions

7 Sensor probe handling

8 Electrical connections

9 Operation

10 Maintenance

11 Conﬁguring

12 Modbus RTU Communication

13 Modbus holding registers

14 Warranty

15 Documents / Resources

15.1 References

16 Related Posts

Carbon Monoxide

Carbon Monoxide is a colorless, odorless, and tasteless gas that is highly toxic.
Synonyms: Carbonous oxide, Carbon (II) oxide, Flue gas, Monoxide.

Chemical formula		CO
Molar weight		28
Relative gas density (to air)		0.97
Conversion		1 ppm = 1.15 mg/m3
Boiling point		-191 .5 °C
Low explosive limit (LEL), % vol. in air		13.
Upper explosive limit (UEL), % vol. in air		74
Odor		Odorless
Hazards		Highly toxic. Mild poisoning causes lightheadedness, confusion, headache, dizziness, and flu-like effects. Larger exposures can lead to toxicity of the CNS and heart, and death. After acute poisoning, long-term problems may occur. CO also has negative effects on a baby if exposed during pregnancy. Chronic exposure to low levels can lead to depression, confusion, and memory loss.
Exposure limits (NIOSH)	TWA	40 mg/m3 /35 ppm
	IDLH	1380 mg/m3 /1200 ppm

Conversion of ppm to mg/m³ is calculated for 25°C and 1 atm.

Speciﬁcations

Sensor type	Electrochemical cell
Sampling method	Diffusion
Detection range	0…300 ppm	I 0…1000 ppm
Maximum overload	2000 ppm
Resolution / digital unit	1 ppm
Response time T90	< 30 s
Sensor lifetime	> 10 years
Calibration interval	12 months
Repeatability	< t 5%
Signal update	Every 1 second
Power supply	12…36 12…36 VDC (default), or 230 VAC as options
Power consumption	< 2 VA
Analog outputs	2 x 4-20 mA / 0-10 V, user settable
Load resistance	Fk< (Us- 2V)/ 22 mA for 4-20 mA R. > 250 kOhm for 0-10 V mode:
Digital interface	RS485, Modbus RTU protocol; No galvanic isolation
Enclosure	Grey ABS, wall mount, protection class IP65
Dimensions	H90 x W145 x D55 mm (overall dimensions H140 x W145 x D55 mm)
CE marking	According to 2014/30/EU and 2014/35/EU, EN 50491-41:2012 EN 61000-6-3:2020, EN 61326-1:2013(EMC, emissions) EN 61000-6-1:2019, EN 61000-6-2:2019(EMC, Immunity) EN 60079-29-1:2016, EN 60079-29-2:2015 and EN 60079-29-3:201 4
Outputs assignment	OUT1 gas; OUT2 gasNOTE for LCD version only output 1 is available
Output scale width	> 10 x resolution Recommended: 20-100% of the detection range
Operating conditions	-20…+50 °C, 0…90% RH non-condensing, 0,9…1,1 atm Explosion-safe areas, Non-aggressive atmosphere NOTEI The sensor exhibits considerable sensitivity to acetylene, ethylene, hydrogen and nitric oxide

Relay option
Output relays	2 x SPST relays (closing contact), 250 VAC/ 30 VDC, 5A max
Default alarm set-points	RE1 (LOW): set 25; release 20 ppm RE2 (HIGH): set 35; release 28 ppm
Signalling options
Visual	Red and green LEDs
Acoustic alarm	Buzzer 85 dB
LCD indicator option
Operating temperature	0…+50 °C
Display dimensions	72 x 36 mm
Number of digits	3.5 7-segment
Character height	14mm
Other features	Backlight
Other options
Remote probe	Protection IP65, default cable length 3.0 m; max height 80 mm, max diameter 65 mm

Product description

E2638 series detectors-transmitters belong to the PluraSens® family of multifunctional measurement instruments. The instruments utilize gas sensors of various types with excellent repeatability, stability, and long lifetime.
E2638 series provides two independent analog outputs OUT1 and OUT2, user-selectable to 4-20 mA or 0-10 V, proportional to gas concentrations. RS485 Modbus RTU digital communication interface allows easy instrument conﬁguration and integration into various automation systems.
The following features are available as an 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,
Acoustic (85 dB buzzer) and visual (red and green LED) signaling,
24 VAC or 230 VAC as options for power supply module,
LCD indicator,
Remote probe.

The version of your device is marked on the package. If the symbol ⚠ is marked on the equipment, consult the documentation for further information.
Safety requirements
Misuse will impair the protection of the product. 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.
Removal of the PCB from the enclosure voids the warranty. Do not touch the electronic components directly, as they are sensitive to static electricity.
Connection diagrams can be found in the electrical connections section. The device might not perform correctly or be damaged if the wrong power supply is connected.
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 both in a non-hazardous area and in a basic electromagnetic environment, where the latter is deﬁned in EN 61326-1. Avoid strong mechanical shock and vibrations. Avoid corrosive atmosphere and areas highly contaminated with dust, oil mist, etc. Keep the instrument away from direct sunlight. A sudden temperature or humidity change might affect the sensitivity of the sensor.

Installation guidelines

Before proceeding with the installation it is mandatory to read the Safety requirements section and make sure to comply with all listed instructions. Installation standards EN
60079-29-2 and EN 45544-4 are also recommended for further instructions and related information about the installation. During the installation of the detector-transmitter 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 airﬂows, etc.),
Carbon monoxide has practically the same density as air and spreads evenly in the room. Install the sensor in proximity to possible leakage or generation source, taking into consideration the temperature of the gas, the air currents in the room, etc.
The device should be accessible for maintenance and repair.

The aforementioned conditions above will affect the coverage area of the device. however, the coverage area for a transmitter is usually between 2.5 to 5 meters radius.
For early leakage detection install the sensor as close as possible to the potential leakage sources (ﬂanges, valves, pressure reducers, pumps, etc.), taking into consideration other points listed above.
For general area monitoring without deﬁnite leakage sources, the detectors should be distributed evenly in the room.
For personal safety control, the detectors are installed in the breathing zone (at the height of the head of people or animals). The recommended sensor position is vertical, pointing downwards.
For installing the device, attach the device to the wall using provided screws through the side mounting holes or key slots (see mountains dimensions).

Mounting dimensions

Front view

Bottom view

Sensor probe handling

The E2638 series devices are available with a remote probe. The remote probe is connected to the main unit with a shielded cable. The default remote probe cable length is 3 m.

A )Wall mount remote probe with ﬁxing clamp (default version) ,
B) Remote probe with rubber ﬂange and three self-tapping screws (on request)
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 should be replaced if it gets strongly contaminated. To replace the PTFE ﬁlter, unscrew sensor head cap and remove the old ﬁlter. Place a new ﬁlter into the cap and tighten it again.
NOTE! Never stab or press the ﬁlter near its center where the sensor is located since this may damage the sensor. Do not remove the ﬁlter as it may cause the device to show incorrect values and/or break the sensor.
The recommended orientation of the sensor probe is vertical with the sensor tip pointing downwards. This prevents the possible accumulation of condensed water on the sensor protection ﬁlter.

Gas sensor replacement procedures

Remove the sensor head cap from the device (or the remote probe),
Remove the PTFE ﬁlter (if it is not removed within the cap),
Remove the O-ring rubber,
Detach the electrochemical sensor from the device,
Insert the new electrochemical sensor inside,
Put back the O-ring rubber, PTFE ﬁlter, and the head cap, respectively.

Electrical connections

Unscrew four lid screws and detach the lid from the device. 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.

Jumpers
J1	OUT1 type (open: 4-20 mA; closed 0-10 V)
J2	OUT2 type (open: 4-20 mA; closed 0-10 V)
X6	Reset Modbus network parameters to default
X4 terminals
OUT1	4-20 mA / 0-10 V output
OUT2	4-20 mA / 0-10 V output
OV	0 V / 24 VAC Neutral (optional)
A	RS485 A / Data +
B	RS485 B / Data –
+U	+24 VDC / 24 VAC Phase (optional)
X5 terminals (optional)
L	90.. 265 VAC Phase
N	90…265 VAC Neutral
RE1 NO	Relay 1, normally open terminal
RE1 COM	Relay 1, common terminal
RE2 NO	Relay 2, normally open terminal
RE2 COM	Relay 2, common terminal

The screwless quick connect spring terminals on the E2638 series devices are suitable for a wide range of wires with a cross-section of 0.2…1.5 mm2. We recommend striping the wire end by 8…9 mm and using wire end sleeves.
To connect the wire, insert the wire end into the terminal hole. To disconnect, push the spring-loaded terminal lever, pull the wire out, and release the lever.
Use a twisted-pair cable, e.g. LiYY TP 2×2×0.5 mm2 or CAT 5, to connect the device to the RS485 network. A and B on the device represent DATA+ and DATA- respectively, polarity must be respected when connecting to an external RS485 network.
Both analog outputs can be independently changed between 4-20 mA and 0-10 V type using jumpers J1 (OUT1) and J2 (OUT2). By closing pins on a speciﬁc jumper the related output is 0-10 V, with an open jumper the output is 4-20 mA. Power restart is required after changing the position of the jumpers.

NOTE! The outputs are not galvanically isolated from the external power supply and share a common 0V. Allowed load resistance limits are stated in the Speciﬁcations table. To power the instrument from an external power source, connect terminals 0V and +U to the source.
If the integrated mains power supply module is used, connect terminals L and N to the mains.
NOTE! Actuator short-circuits should be avoided, to protect the instrument relays, use external fuses or safety switches.

Correct and incorrect cabling for 24 VAC

Operation

Turn on the power. The instrument warm-up time takes about 1 minute after switching on and the ﬁnal sensor stabilization time to maximum accuracy takes about 30 minutes. The operating status is indicated by the LED on the PCB of the device. The control LED (red) response to different processes is presented in the following table:

Mode	LED mode
During calibration mode or sensor heating period (if activated)	0.5 Hz (50% on, 50% off)
Relay 1 turned on	Blinking 1 Hz (50% on, 50% off)
Relay 2 turned on	Blinking 2 Hz (50% on, 50% off)
During Modbus communication cycle	Short on-off pulses
Normal operating/measurement	Continuously on or off

Make sure that the detector-transmitter is properly mounted, the external devices connected, power LED (green) on and control LED (red) constantly lit. Place the lid back and ﬁx it with the screws. The device is ready to use.

Maintenance

Do not perform any maintenance operation with the power on.
Clean the device with a soft damp cloth. Do not use any abrasive cleaning agents. Do not immerse the device in water or any cleaning media.
Calibration
E2638-CO gas detector-transmitters have been calibrated by the Manufacturer with standard gas mixtures before delivery. Provided that the sensor is used under moderate conditions, the recommended interval for ﬁeld recalibration is 12 months. Please contact your dealer for more information.

Delivery set

Detector-transmitter E2638
Mounting accessories:
- 4 screws with plastic dowels
- Fixing clamp for remote probe version

Order code for E2638-CO options

E2638 options	Order code
Remote probe, 3 m cable	E2638-CO-RP33-3
Remote probe, 10 m cable	E2638-CO-RP33-10
Duct mount option, stem 035xL230 mm	E2638-CO-DM
Integrated 24 VAC power supply module	E2638-00-24VAC
Integrated 90…265 V mains power supply module	E2638-00-230
Local LCD single value display 36 mm x 72 mm	E2638-CO-LCD
Remote LCD single value display, wall mount box 115 x 65 x 40mm, 3 m cable	E2638-CO-RLCD3
Two SPST relays	E2638-CO-R
Two LEDs (visual alarm)	E2638-CO-LED
Buzzer (acoustic alarm)	E2638-CO-B
Self-test button for relays	E2638-CO-TB
Integrated coreless micropump	E2638-CO-MP

Conﬁguring

A standard conﬁguration kit includes a USB-RS485 converter, ﬁxed ﬂow regulator, gas tubing with applicators, and a software pack. Please contact your Seller for more information.
Detectors-transmitters E2638 share all functionalities of the PluraSens® multifunctional platform. The features and options include:

Digital output change rate-limiting ﬁlter
Digital integrating (averaging) ﬁlter
Free assignment of each analog output to the chosen parameter
Flexible setting of analog output scales for each output
Output zero and slope adjustment for calibration
Free assignment of each of two relays to the chosen parameter
Several relay control logic modes
Switch delays and minimum on/off state durations for each relay

The output scales can be changed by Modbus commands by using the conﬁguration software and the standard conﬁguration kit (see Modbus RTU Communication).
Return to default settings
To reset the device’s Slave ID, baud rate, and stop bit numbers to factory settings, proceed as follows:

De-energize the device
Connect the X6 jumper
Turn on the device
De-energize the device
Disconnect the X6 jumper
Turn on the device

Modbus RTU Communication

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 a single register

Communication parameters

Parameter	Permitted values	Default
Supported baud rates	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 a 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)

Modbus holding registers

Register addresses are shown 0-based, Address in hexadecimal, Reg in decimal format.
Modbus holding register numbers MHR are shown in the decimal 1-based format and may be addressed either from 00001 or 40001 base.

Address	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	Baud rate *	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	Technological: age of last data in seconds (read) / restart (write)	0…65535 s (read), writing 42330 restarts the instrument	–

0x00A5	165 /40166	RW	Zero adjustments 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 units/ s	1…32000, 0 – no limit	0
0x00A8	168 / 40169	RW	Integrating ﬁlter time constant, s	1…32000 (seconds), 0 – no ﬁlter	0
Address	Reg / MHR	RW	Description	Supported values (dec)	Default
0x00C9	201 /40202	RW	Parameter tied to analog output 1	0 – None 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 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 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 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

Address	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, RO 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, RO bit[7]=0/1 – current/voltage output detected on output2, RO 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 – 1 Hz (50% on, 50% off) LED signal off/on if relay1 turned on bit[12]=0/1 – 2 Hz (50% on, 50% off) LED signal off/on if relay2 turned on

0x0101	257 /40258	R	Raw gas sensor data	0…4095, ADC units
0x0103	259 /40260	R	Gas concentration, gas units	0…65535, gas units
0x0105	261 /40262	RW	0% value for analog output 1	-32000…+32000, gas units	User deﬁned
0x0106	262 /40263	RW	100% value for analog output 1	-32000…+32000 , gas units	User deﬁned
0x0107	263 /40264	RW	0% value for analog output 2	-32000…+32000, gas units	User deﬁned
0x0108	264 /40265	RW	100% value for analog output 2	-32000…+32000, gas units	User deﬁned

* – The new value is applied after restart.
** – Broadcast slave ID 0 can be used to assign a new ID to the instrument with an unknown ID. When addressing by ID 0 the device shall be the only Modbus instrument in the network. The device will not respond to the Master command when addressed by ID 0.
*** – This value is dynamic and not kept in EEPROM after a restart.

Warranty

This product is warranted to be free from defects in material and workmanship for a period of one year from the date of the original sale. During this warranty period, the Manufacturer will, at its option, either repair or replace a product that proves to be defective. This warranty is void if the product has been operated in conditions outside ranges speciﬁed by the Manufacturer or damaged by customer error or negligence or if there has been an unauthorized modiﬁcation.