Delta OHM HVAC40 Humidity and Temperature Transmitters/Hygrostats User Manual

Operating manual
Humidity and temperature transmitters / Hygrostats
HVAC40… series

www.deltaohm.com
Keep for future reference.

INTRODUCTION

HVAC40… series transmitters and hygrostats measure temperature, relative humidity and dew point using an interchangeable relative humidity and temperature digital sensor.
A stainless steel 10 µm filter protects the sensor against dust and particles (other filters are available for different applications).
The probe is available in three different versions:

• fixed vertical probe for wall mounting (HVAC40…TV);
• fixed probe with 2 m cable (HVAC40…TC.2);
• fixed duct horizontal probe (HVAC40…TO).

Available outputs, depending on the model:

• RS485 Modbus­RTU digital output (HVAC40S17…);
• 0…10 V voltage analog output (HVAC40V17…);
• 0…20 mA / 4…20 mA active current analog output (HVAC4017…);
• 2-wire (current loop) 4…20 mA analog output (HVAC40A17…);
• ON/OFF relay switch (HVAC40R17…).

Versions with a 4-digit LCD display (option L) are available, which allow the measured parameters to be displayed.
In the versions with LCD, two LED indicators indicate the presence of the power supply and of an eventual alarm condition: exceeding of the set measurements thresholds, in the versions with relay switch output; measurement detected outside the measuring range, in the versions with analog or digital output.
The instruments are factory calibrated and ready for use.
The configuration can be made by connecting the serial port of the instrument to the PC or by means of the quick configuration dip switches on the circuit board. The versions with relay switch output are equipped with two internal buttons for the configuration via the display.
Models

TECHNICAL CHARACTERISTICS

Sensor| Interchangeable digital relative humidity and temperature sensor
---|---
Measuring range| 0…100 %RH / recommended 5…80 %RH
-20…+80 °C / -20…+80 °C Td
Resolution| 0.1 %RH / 0.1 °C / 0.1 °C Td
Accuracy| Typ. ± 2.5 %RH (5…80 %RH) @ t = 15…35 °C
Typ. ± 0.3 °C @ t = -20…70 °C / ± 0.5 °C @ t = remaining range For the Dew Point see the table below
Long term drift| Typ. < 0.25 %RH/year Max. 0.03 °C/year
Response time| 10 s (63% of final value with 1 m/s air flow)
Output| HVAC4017…: Active analog 0…20 or 4…20 mA (RLmax = 500 L)
HVAC40 V 17…: Analog 0…10 Vdc (RLmin = 10 kL)
HVAC40 A 17…: 2-wire (current loop) 4…20 mA (RLmax = (Vdc-12)/0,022)
HVAC40 S 17…: Digital RS485 Modbus-RTU
HVAC40 R 17…: ON/OFF relay switch with SPDT contact 3 A/250 Vac, 3 A/30 Vdc resistive load
The analog output goes to 22 mA or 11 V in case of measurement outside the measuring range.
Alarm| Front red LED: exceeding of the set measurements thresholds in HVAC40R17… models, measurement detected outside the measuring range in the other models.
The internal buzzer in HVAC40R17… models.
Power supply| HVAC4017… and HVAC40V17…: 24 Vac ± 10% or 18…40 Vdc
HVAC40A17…: 15…30 Vdc
HVAC40S17…: 12…30 Vdc
HVAC40R17…: 24 Vac ± 10% or 15…36 Vdc
Power consumption| HVAC4017…: 20 mA @ 24 Vdc and Iout=12 mA
HVAC40V17…: 4 mA @ 24 Vdc
HVAC40S17…: 2 mA @ 24 Vdc
HVAC40R17…: < 1 W @ 24 Vdc
Electrical connections| Screw terminal block, max 1.5 mm2, PG9 cable gland
Connection to PC| RS232 serial port (except HVAC40S17…) RS485 serial port (only HVAC40S17…)Can be connected to a USB port by using the optional CP27 (except HVAC40S17…) or RS48 (only HVAC40S17…) adapter
Sensor operating conditions| -20…+80 °C. The sensor shows best performance when operated in 20…80 %RH humidity range. Long-term exposure outside the indicated range (especially at high humidity) may temporarily offset the sensor response. The sensor is protected from water and dust.
Instrument operating conditions| -20…+60 °C / 0…95 %RH
Storage temperature| -20…+80 °C
Housing dimensions| 80 x 84 x 44 mm
Protection degree| IP65

Accuracy of Dew Point measurement (parameter calculated from the measurement of relative humidity and temperature):

INSTALLATION

By opening the lid, 3 mm diameter holes are available so to allow securing the base of the instrument directly to a panel or to the wall.

The models with duct horizontal probe can be fixed by using the HD9008.31 flange, a PG16 metal cable gland ( 10…14 mm) or a 3/8″ universal biconical connection.

Internally there are :

• the terminal header for connecting the power supply and the output;
• the RS232 serial connector (COM AUX, except HVAC40S17…);
• the dip switches for quick configuration.
• the buttons for the configuration via display (only HVAC40R17…).

ELECTRICAL CONNECTIONS

Models with digital RS485 output (HVAC40S17…)
In the RS485 connection, the instruments are connected in a sequence through a shielded cable with twisted pair for signals and a third wire for the common. Line termination must be set at the two network ends.
The maximum number of devices that can be connected to the RS485 line (Bus) depends on the load characteristics of the devices to be connected. The RS485 standard requires that the total load does not exceed 32 unit loads. A load of an HVAC40S17T… transmitter is equal to ¼ of the unit load. If the total load is greater than 32 unit loads, divide the network into segments and add a signal repeater between a segment and the successive one. Line termination should be applied at both ends of each segment.
The instrument has a built-in line termination that can be connected or removed through a short jumper placed at the bottom of the electronic board. If the instrument is the last or the first device of a networking group, connect the termination by placing the short jumper on the “RT ON” side. If the instrument is not at the end of a networking group, disconnect the termination by placing the short jumper on the side opposite “RT ON”.
The cable shield must be connected to both lines’ ends. The cable should have the following features:

• Characteristic impedance: 120 ohm
• Capacity: less than 50pF/m
• Resistance: less than 100 ohm/km
• Gauge: 0,22 mm2 (AWG24) at least

The cable maximum length depends on the baud rate and cable characteristics. Typically, the maximum length is 1200 m. The data line must be kept separated from any power lines in order to prevent interferences with the transmitted signal.
3.2 CONFIGURATION DIP SWITCHES IN THE MODELS WITH ANALOG OUTPUT
HVAC4017T…, HVAC40A17T…, and HVAC40V17T… transmitters have 4 pre-configured temperature ranges for the analog output. In order to use a preconfigured temperature range, set the dip switch 1 to ON and set the temperature range with the dip switches 2 and 3, according to the following table:

Dip switch number

| Temperature

range

---|---
1| 2| 3
ON| OFF| ON| 0…+50 °C
ON| ON| OFF| -20…+50 °C
ON| OFF| OFF| -20…+80 °C
ON| ON| ON| 0…+80 °C
OFF| N.U| N.U| Set via serial

In the HVAC4017T… and HVAC40V17T… models, with active analog output, a dip switch is OFF when placed down; instead, it is ON if placed up. The dip switch 1 is on the left.
In the HVAC40A17T… models, with 2-wire current output, a dip switch is OFF when placed on the right; instead, it is ON if placed on the left. The dip switch 1 is at the bottom.
If a temperature range other than the preconfigured ones is desired, it is necessary to set the dip switch 1 to OFF and set the temperature range via COM AUX serial port.
Note: the 4 preconfigured temperature ranges can also be set via COM AUX serial port with the commands K0…K3.
The dip switch 4 is used to select the relative humidity (R.H.) or the dew point (D.P.) measurement.

Dip switch number
| Measurement
---|---
4
OFF| R.H.
ON| D.P.

3.3 CONFIGURATION DIP SWITCHES IN THE MODELS WITH RS485 DIGITAL OUTPUT
In the HVAC40S17… models, the transmitter Modbus address is equal to the sum of the value set with the dip switches (value settable from 0 to 15) and the value set with the serial command MA (value settable from 1 to 216, default = 1). By setting a dip switch to ON (upwards), the following values are added to the address:

| Dip switch number
---|---
1| 2| 3| 4
ON| 8| 4| 2| 1
OFF| 0| 0| 0| 0

For example: if the dip switches 1 and 3 are set to ON and the dip switches 2 and 4 are set to OFF, the value set with the dip switches is 8+2=10. If the value set with the serial command MA is 1 (default value), the transmitter Modbus address is 10+1=11.
The dip switches can be set even if the transmitter is powered, and the change is effective immediately.
Note: in the models with RS485 digital output, the selection of the relative humidity or dew point measurement does not take place via a dip switch but via P0/P1 serial commands.
3.4 CONFIGURATION DIP SWITCHES IN THE MODELS WITH RELAY OUTPUT
In the HVAC40S17… models, the dip switch 2 is used to select the relative humidity (R.H.) or the dew point (D.P.) measurement.

2
OFF| R.H.
ON| D.P.

3.5 CONFIGURATION VIA THE SERIAL PORT

1. HVAC4017T…, HVAC40A17T…, HVAC40V17T… and HVAC40R17T… models Connect the COM AUX serial port of the instrument to the RS232 (via the RS27 cable) or USB (via the cable CP27) port of the PC. If the CP27 cable is used, install the USB drivers on your PC.
   HVAC40S17T… models Connect the RS485 output of the instrument to the RS232 (via a RS485/RS232 converter) or USB (via a RS485/USB converter, for example the RS48 cable) port of the PC. If an RS485/USB converter is used, install the USB drivers on your PC.

2. On the PC, launch a standard serial communication software and set the baud rate to 115200, the communication parameters to 8N2 and the COM port number to which the instrument is connected.

3. Only for HVAC40S17T… models, power cycle the instrument and send the command @ within 10 seconds from the instrument power on.

4. If necessary, send the CAL START command. The CAL START command enables the use of some commands, specified in the tables below. The command CAL START is automatically disabled after 5 minutes of inactivity or if the CAL END command or an incorrect command is sent.

5. Send the setting or reading commands given below.

6. Only for HVAC40S17T… models, power cycle the instrument to restore the MODBUS-RTU protocol.

Serial commands
Instrument general information

Command

|

Description

---|---
G0| Reads the instrument modelIf the instrument has analog output, the instrument model is followed by the cur- rent output setting (output lower analog value and temperature range associated with the output)
Example of reply: HVAC40A17TC.2_4 -20 / 80 °C (output lower analog value = 4 mA, temperature range associated with the output = -20 / 80 °C
GF| Similar to G0, but provides the configuration of the analog output set via serial
GS| Similar to G0, but provides the configuration of the analog output set via dip switches
G2| Reads the instrument serial number
G3| Reads the instrument firmware version
G4| Reads the instrument firmware date

Measurement

Command

|

Description

---|---
F0| Disable filtering of measurements (the last instantaneous measurement is pro-vided)
F1| Enable filtering of measurements (default, a weighted average of the last measurements is provided)
P0| Sets relative humidity as humidity measurement (default). Only HVAC40S17…
P1| Sets dew point as humidity measurement. Only HVAC40S17…
GP| Reads the type of measurement set for humidity: relative humidity (0) or dew point (1). Only HVAC40S17…
U3| Displays the temperature measurement on LCD
U4| Displays the humidity measurement on LCD (relative humidity or dew point de- pending on the setting)
U5| Alternates the temperature and humidity measurements on LCD
UC| Sets °C as temperature unit of measurement (default)
UF| Sets °F as temperature unit of measurement
GU| Reads the temperature unit of measurement
GM| Reads the current measurement (not available in HVAC40S17… models)
The measurements are provided without the decimal point and in the sequence temperature, relative humidity and dew point Example of reply: 00230;C; 264;00032;Td C; (23.0 °C; 26.4 %UR; 3.2 °C Td)

Alarm (only HVAC40R17… models)

Command

|

Description

---|---
U0| Sets 0…20 mA as the current analog output
U1| Sets 4…20 mA as current analog output (default)
Anne| Associates the initial scale of temperature analog output with snnn (“s” is the sign of the value) ()
Default: -200 (=-20.0 °C)
AS snnn| Associates the full scale of temperature analog output with snnn (“s” is the sign of the value) ()
Default: +800 (=+80.0 °C)
AG| Reads the temperature range associated with the analog output Example of reply:
User Analog Scale: -200 / +800 C (-20.0…+80.0 °C)
KU| Enables the temperature range set with the AIsnnn and ASsnnn commands
K0| Enables the -20…+80 °C temperature range
K1| Enables the -20…+50 °C temperature range
K2| Enables the 0…+50 °C temperature range
K3| Enables the 0…+80 °C temperature range

(*) The value must be written without the decimal point, even if it is not an integer value (e.g., to set thresholds 1 to 15.0 %RH, write AWT1+150). In the case of the dew point measurement, the thresholds and hysteresis values are considered in the unit of measurement set in the instrument.
The temperature range set with the AIsnnn and ASsnnn commands is active only if it is enabled with the KU command and the dip switch 1 is set to OFF.
Alarm (only HVAC40R17… models)
The commands starting with AW require prior sending of the CAL START command.
The threshold values refer to the relative humidity measurement or the dew point measurement depending on the humidity measurement selected (via P0/P1 serial commands for HVAC40S17… models, via dip switch for the other models

Command|

Description

---|---
on| Sets the relay operating mode n=0 Þ Negative (NC contact is closed if no alarm, NO contact is closed if in alarm) n=1 Þ Positive (NO contact is closed if no alarm, NC contact is closed if in alarm) Default: Negative
ARS| Reads the relay operating mode
AWB| Sets the buzzer activation status: n=0 Þ OFF (default); n=1 Þ ON
ARB| Reads the buzzer activation status
Awan| Sets the alarm activation status: n=0 Þ OFF (default); n=1 Þ ON
ARA| Reads the alarm activation status
AWE n| Sets the alarm operating mode n=0 Þ Above threshold (alarm is on if measurement is greater than threshold 1) n=1 Þ Below threshold (alarm is on if measurement is less than threshold 1) n=2 Þ Outside thresholds (alarm is on if measurement is less than threshold 1 or greater than threshold 2)
Default: Above threshold
ARE| Reads the alarm operating mode
AWT1 snnn| Sets the threshold 1 value to snnn (“s” is the sign of the value) ()
Default: 300 (=30.0 %RH)
ART1| Reads the threshold 1 value
AWT2 snnn| Sets the threshold 2 value to snnn (“s” is the sign of the value) ()
Default: 700 (=70.0 %RH)
ART2| Reads the threshold 2 value
Anne| Sets the hysteresis value to nnn *()
Default: 100 (=10.0 %RH)
ARCH| Reads the hysteresis value
AWD1 nnn| Sets the alarm activation delay to nnn seconds (0… 600 s) Default: 0
ARD1| Reads the alarm activation delay value
AWD2 nnn| Sets the alarm deactivation delay to nnn seconds (0… 600 s) Default: 0
ARD2**| Reads the alarm deactivation delay value

MODBUS (only HVAC40S17… models)

Command

|

Description

---|---
MA nnn| Sets MODBUS address to nnn (default 1)
L1| Reads the MODBUS address
MB n| Sets the MODBUS Baud Rate to:
9600 if n=0
19200 if n=1 (default)
38400 if n=2
57600 if n=3
115200 if n=4
L2| Reads the MODBUS Baud Rate
MP n| Sets MODBUS parity and stop bits to:
8N1 if n=0 [No parity, 1 stop bit] 8N2 if n=1 [No parity, 2 stop bits] 8E1 if n=2 [Even parity, 1 stop bit] (default)
8E2 if n=3 [Even parity, 2 stop bits] 8O1 if n=4 [Odd parity, 1 stop bit] 8O2 if n=5 [Odd parity, 2 stop bits] The number of bits is fixed to 8
L3| Reads the setting of MODBUS parity and stop bits
MW n| Sets waiting time after MODBUS transmission to:
Immediate reception if n=0 (violates protocol)
Waiting for 3.5 characters if n=1 (default, respects protocol)
L4| Reads the setting of waiting time after MODBUS transmission

Relative humidity calibration
The commands starting with R require prior sending of the CAL START command.

Command

|

Description

---|---
GC| Reads the calibration type in use: factory or user
GD| Reads the factory calibration date (format yyyy/mm/dd hh.mm.ss)
GE| Reads the user calibration date (format yy yy/mm/dd hh.mm.ss)
R0 vvv| Calibrates the relative humidity lower point to the value vv. v %RH The value must be between 300 (=30.0 %RH) and 350 (=35.0 %RH)
R1 vvv| Calibrates the relative humidity upper point to the value vv. v %RH The value must be between 730 (=73.0 %RH) and 770 (=77.0 %RH)
RU0| Uses the factory calibration
RU1| Uses the user calibration
RR| Resets the user calibration to the factory calibration
RD yymmddhhmmss| Sets the user calibration date

3.6 CONFIGURATION VIA THE INTERNAL BUTTONS (ONLY HVAC40R17…)
The upper button B1 allows scrolling the available operating parameters, while the lower button B2 allows changing the setting of the selected parameter. The function of a button depends on whether it is short or long pressed. To short press a button, hold it down for about 1 second until the power LED turns off. To long press a button, hold it down for at least 3 seconds until the power LED turns off and then turns on again.
Long press the upper button B1 to enter the menu. Inside the menu, long press B1 to scroll the available parameters. Below is the sequence of the operating parameters (in brackets the indication that appears on the display) with the possible settings for nonnumerical parameters:

• Relay operating mode (SECU): o Negative (NEG): NC contact is closed if no alarm, NO contact is closed if in alarm o Positive (POS): NO contact is closed if no alarm, NC contact is closed if in alarm
• Buzzer activation (BEEP): o OFF: buzzer disabled o ON: buzzer enabled
• Alarm activation (ALAR): o OFF: alarm disabled o ON: alarm enabled
• Alarm operating mode (EDGE): o Above threshold (RISE): alarm is on if measurement is greater than threshold 1 o Below threshold (FALL): alarm is on if measurement is less than threshold 1 o Outside thresholds (OUTS): alarm is on if measurement is less than threshold 1 or greater than threshold 2
• Threshold 1 (THR1) : Value of the threshold for above (RISE) and below (FALL) alarm operating modes; value of the lower threshold for outside thresholds (OUTS) alarm operating mode.
• Threshold 2 (THR2): Value of the upper threshold for outside thresholds (OUTS) alarm operating mode. The parameter appears only if the alarm operating mode is set to OUTS.
• Hysteresis (HYST): Value of the hysteresis for above (RISE) and below (FALL) threshold alarm operating modes. The parameter does not appear if the alarm operating mode is set to OUTS.
• Alarm activation delay (T1) : Value in seconds of the time delay for generating the alarm. The alarm is generated only if the measurement exceeds the threshold for more than the set time.
• Alarm deactivation delay (T2): Value in seconds of the time delay for deactivating the alarm. The alarm is deactivated only after the set time has elapsed from the disappearance of the alarm condition.

Note: the threshold values refer to the relative humidity measurement or the dew point measurement depending on the humidity measurement selected (via P0/P1 serial commands for HVAC40S17… models, via dip switch for the other models).
Note: the EDGE, THR1, THR2, HYST, T1 and T2 parameters do not appear if the alarm is set to OFF.
Changing non-numerical parameters:

• Select the parameter by using the button B1.
• Short press the button B2 to change the setting.
• Long press button B1 to move to the next parameter.

Changing numerical parameters:

• Select the parameter by using the button B1.
• Short press the button B2 to change the sign.
• Long press the button B2 to select the first digit.
• Short press the button B2 to change the selected digit.
• Long press the button B2 to select the next digit.
• Repeat the above two steps until all the digits are set.
• Long press button B1 to move to the next parameter.

While a parameter value is displayed, a short press of button B1 will briefly show the name of the currently selected parameter.

ALARM OPERATING MODES (HVAC40R17…)

The operating modes shown are valid only for the HVAC40R17… models.
Above threshold (RISE): the alarm is turned on if the measurement is greater than threshold 1 for more than T1 seconds. The alarm is turned off when the measurement becomes less than threshold 1 minus the hysteresis for more than T2 seconds.
The up arrow on the left of the display is shown when this mode is selected.

Below threshold (FALL): the alarm is turned on if the measurement is less than threshold 1 for more than T1 seconds. The alarm is turned off when the measurement becomes greater than threshold 1 plus the hysteresis for more than T2 seconds.
The down arrow on the left of the display is shown when this mode is selected.

Outside thresholds (OUTS): the alarm is turned on if the measurement is greater than threshold 2 or less than threshold 1 for more than T1 seconds. The alarm is turned off when the measurement returs between the two thresholds for more than T2 seconds. No hysteresis is applied to the thresholds.
The up and down arrows on the left of the display are shown when this mode is selected.

When the measurement is in alarm, the red LED lights up, the buzzer is on (if enabled) and the relay is switched (depending on the chosen relay operating mode).
While in alarm, the buzzer can be stopped (only for the current event) by short pressing the button B1.
The alarm is disabled while in the configuration menu.

MODBUS-RTU (HVAC40S17…)

The default communication parameters are 19200, 8E1 and can be changed with the serial commands MB/MP.
The instrument address (default 1) can be changed with the serial command MA.
The MODBUS registers available are shown below.

Input Registers

Bit 1 = 1 Þ relative humidity measurement error Bit 2 = 1 Þ dew point measurement error Bit 3 = 1 Þ configuration data error| 16-bit integer

INSTRUMENT STORAGE

Instrument storage conditions:

• Temperature: -20…+80 °C.
• Humidity: less than 90 %RH no condensation.
• In storage, avoid places where:
• humidity is high;
• the instrument is exposed to direct sun radiation;
• the instrument is exposed to a high-temperature source;
• high vibration levels are present;
• the instrument may be exposed to vapor, salt, and/or corrosive gas.

SAFETY INSTRUCTIONS

General safety instructions
The instrument has been manufactured and tested in accordance with the safety standard EN61010-1:2010 “Safety requirements for electrical equipment for measurement, control and laboratory use” and has left the factory in perfect safety technical conditions. The instrument’s proper operation and operating safety can be ensured only if all standard safety measures, as well as the specific measures described in this manual, are followed. The instrument’s proper operation and operating safety can be ensured only in the climatic conditions specified in this manual. Do not use the instruments in places where there are:

• Corrosive or flammable gases.
• Direct vibrations or shocks to the instrument.
• High-intensity electromagnetic fields, static electricity.

User obligations The instrument operator shall follow the directives and regulations below that refer to the treatment of dangerous materials:

• EEC directives on workplace safety.
• National law regulations on workplace safety.
• Accident-prevention regulations.

ACCESSORIES ORDERING CODES

• RS27
  RS232 null-modem serial connection cable with SubD 9-pin connector on the PC side and 3-pole connector on the side of the instrument.

• CP27
  Serial connection cable with a USB connector on the PC side and 3-pole connector on the side of the instrument. The cable has a built-in USB/RS232 converter and it connects the instrument directly to the USB port of the PC.

• RS48
  Cable for RS485 connection with built-in USB/RS485 converter. The cable has a USB connector for the PC and 3 separate wires for the instruments.

• HD33
  33%RH saturated solution for checking the relative humidity sensor, complete with screw adaptor for probes 14 mm, M12×1 thread.

• HD75
  75%RH saturated solution for checking the relative humidity sensor, complete with screw adaptor for probes 14 mm, M12×1 thread.

• HD9008.31
  Wall flange with cable gland to fix Ø 14 mm probes.

• PG16
  AISI304 cable gland for Ø 14 mm probes.

DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by ACCREDIA for Temperature, Humidity, Pressure, Photometry / Radiometry, Acoustics, and Air Velocity. They can supply calibration certificates for the accredited quantities.

EU DECLARATION OF CONFORMITY
Delta Ohm S.r.L. a socio unico — Via Marconi 5 — 35030 Caselle di Selvazzano — Padova — ITALY
Document-No. / Month. Year : 5148 / 02.2020
We declare as manufacturer herewith under our sole responsibility mat me following products are in compliance with the protection requirements defined in the European Council directives:…………………………………………
Product identifier:……………………………………………………..
Product description:…………………………………………………..
HVAC40R17T… / HVAC40S17T…………….
Temperature and humidity transmitters / Hygrostats
The products conform to the following European Directives:

Directive / Directives

2014/30/EU| Direttiva EMC / EMC Directive
2014/35/EU| Direttiva bassa tensione / Low Voltage Directive
2011/65/EU| RoHS / RoHS

Applied harmonized standards or mentioned technical specifications:

Harmonized standards

EN 61010-1:2010| Electrical safety requirements
EN 61326-1:2013| EMC requirements
EN 50581:2012| RoHS

The manufacturer is responsible for the declaration released by:
Johannes Overhues
Chief Executive Officer

Caselle di Selvazzano. 24/02/2020
This declaration certifies the agreement with the harmonization legislation mentioned. contained however no warranty of characteristics.
GHM GROUP ­ Delta OHM
Delta Ohm S.r.l. a socio unico Via Marconi 5
35030 Caselle di Selvazzano
Padova
ITALY Phone +39 049 8977150
Fax +39 049 635596 www.deltaohm.com 
sales@deltaohm.com

WARRANTY

Delta OHM is required to respond to the “factory warranty” only in those cases provided by Legislative Decree 6 September 2005 – n. 206. Each instrument is sold after rigorous inspections; if any manufacturing defect is found, it is necessary to contact the distributor where the instrument was purchased from. During the warranty period (24 months from the date of invoice) any manufacturing defects found will be repaired free of charge. Misuse, wear, neglect, lack or inefficient maintenance as well as theft and damage during transport are excluded. Warranty does not apply if changes, tampering or unauthorized repairs are made on the product. Solutions, probes, electrodes and microphones are not guaranteed as improper use, even for a few minutes, may cause irreparable damages. Delta OHM repairs the products that show defects of construction in accordance with the terms and conditions of the warranty included in the manual of the product. For any dispute, the competent court is the Court of Padua. The Italian law and the “Convention on Contracts for the International Sales of Goods” apply.

TECHNICAL INFORMATION

The quality level of our instruments is the result of continuous product development. This may lead to differences between the information reported in the manual and the instrument you have purchased. In case of discrepancies and/or inconsistencies, please write to sales@deltaohm.com. Delta OHM reserves the right to change technical specifications and dimensions to fit the product requirements without prior notice.

DISPOSAL INFORMATION

**** Electrical and electronic equipment marked with specific symbols in compliance with the 2012/19/EU Directive must be disposed of separately from household waste. European users can hand them over to the dealer or to the manufacturer when purchasing new electrical and electronic equipment, or to a WEEE collection point designated by local authorities. Illegal disposal is punished by law.
Disposing of electrical and electronic equipment separately from normal waste helps to preserve natural resources and allows materials to be recycled in an environmentally friendly way without risks to human health.

References

• Senseca - Measuring, monitoring, testing and control instruments

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