HD4807T_4877T_4907T_1
HD4807T_4877T_4907T_2HD4807T_4877T_4907T_3HD4807T_4877T_4907T_4HD4807T_4877T_4907T_5HD4807T_4877T_4907T_6

EM-HD48 & EM-HD49 – Passive or Active Temperature , Relative Humidity and Temperature and Dew Point Transmitters

EM-HD4807T,EM-HD48V07T, EM-HD48S07T, EM-HD4801T, EM-HD48V01T, EM-HD4817T, EM-HD48V17T, EM-HD4877T, EM-HD48V77T, EM-HD4907T, EM-HD4901T, EM-HD4917T, EM-HD4977T – Passive or Active Temperature , Relative Humidity and Temperature and Dew Point Transmitters

EM-HD48.. and EM-HD49.. series of transmitters measure temperature, relative humidity and the dew
point temperature.
Versions with only standard analog output or with only RS485 output with MODBUS‑ RTU
protocol are available. The models with analog output provide a signal suitable for transmission
to a remote display, recorder or PLC. The models with RS485 output are suitable for connection
to a PC or PLC.
The models of the EM-HD48.. series are active transmitters and accept both direct and 24Vac
alternating power supply; they have standard current (4…20mA) or voltage (0…10V) outputs,
or a serial RS485 output, depending on the model. The models of the HD49.. series are
passive transmitters and thus suitable to be inserted in a 4…20mA current loop. The HD48..
and EM-HD49.. series of transmitters are designed for temperature and humidity control in
conditioning and ventilation applications (HVAC/BEMS) in the following sectors: pharmacy,
museums, clean rooms, ventilation ducts, industrial and civil sectors, crowded places,
canteens, auditoria, gyms, high-density farms, greenhouses, etc.

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Product Description

EM-HD48.. and EM-HD49.. series of transmitters measure temperature, relative humidity and the dew
point temperature.
Versions with only standard analog output or with only RS485 output with MODBUS‑ RTU
protocol are available. The models with analog output provide a signal suitable for transmission
to a remote display, recorder or PLC. The models with RS485 output are suitable for connection
to a PC or PLC.
The models of the EM-HD48.. series are active transmitters and accept both direct and 24Vac
alternating power supply; they have standard current (4…20mA) or voltage (0…10V) outputs,
or a serial RS485 output, depending on the model. The models of the EM-HD49.. series are
passive transmitters and thus suitable to be inserted in a 4…20mA current loop. The HD48..
and EM-HD49.. series of transmitters are designed for temperature and humidity control in
conditioning and ventilation applications (HVAC/BEMS) in the following sectors: pharmacy,
museums, clean rooms, ventilation ducts, industrial and civil sectors, crowded places,
canteens, auditoria, gyms, high-density farms, greenhouses, etc.
The HD48.. and HD49.. transmitters measure relative humidity with a well proven temperature
compensated capacitive sensor that assures precise and reliable measurements in the
course of time. The transmitters of the HD48.. and HD49.. series are available in two probe
temperature ranges: standard -20…+80°C and extended -40…+150°C for the most
critical applications. A stainless steel 20μm filter protects the sensors against dust and
particles (other filters are available for different applications).
The transmitters are factory calibrated and no further adjustments are required.
Each series is available in three different versions: with horizontal probe for duct mounting
(EM-HD48…TO…, EM-HD49…TO…), with vertical probe for wall mounting (EM-HD48…TV…, EM-HD49…
TV…) or with remote probe connected to the transmitter by means of a cable (HD48…TC…,
EM-HD49…TC…), cable lengths available are 2, 5 and 10m or for the measure of compressed
air in pipelines (EM-HD48…EM-TP480, EM-HD49…EM-TP480). The probes can be supplied in two different
lengths (135mm or 335mm).
Various accessories are available for the installation: for example to fix the probe to the
duct, it can be used the EM-HD9008.31 flange, a 3/8” universal biconical connection or a PG16
metal cable gland (∅10…14mm). A 4-digit optional display (“L” model) allows to display the
measured parameters in a continuous or sequential mode.

Technical specifications
STANDARD RANGE EXTENDED RANGE
Relative Humidity
Sensor Capacitive
Measuring range 0…100%RH
Accuracy @T=15…35°C ±1.5% RH (0..90%RH), ±2.0% RH (90…100%RH)
Accuracy @ rest of T range ±(1.5+1.5% of the measure ) %RH
Repeatability 0.4%RH
Sensor working temperature -20…+80°C -40…+150°C
Temperature
Measuring range -20…+80°C -40…+150°C
Sensor NTC 10kΩ Pt100 class A
Accuracy ±0.3°C (0..+70°C)
±0.4°C (-20..0°C, +70..+80°C) ±0.3°C
Repeatability 0.05°C 0.05°C
Dew Point
Sensor Parameter calculated from relative humidity and temperature
Measuring range -20…+80°C DP
Accuracy See table 1 below
Repeatability 0.5°C DP
Type of output (according to the model)
Models
EM-HD4807T.. Temperature 4…20mA (-20…+80°C), RL < 500Ω
22mA outside the measuring range
Models
EM-HD4807ET.. Temperature 4…20mA (-40…+150°C), RL < 500Ω
22mA outside the measuring range
Models
EM-HD48V07T.. Temperature 0…10Vdc (-20…+80°C), RL > 10kΩ
11Vdc outside the measuring range
Models
EM-HD48V07ET.. Temperature 0…10Vdc (-40…+150°C), RL > 10kΩ
11Vdc outside the measuring range
Models
EM-HD48S07T..EM- HD48S07ET.. Temperature Only RS485 with MODBUS-RTU protocol
Models
EM-HD4907T.. Temperature 4…20mA (-20..+80°C), RLMax = (Vdc-12)/0.022
22mA outside the measuring range
Models
EM-HD4907ET.. Temperature 4…20mA (-40..+150°C), RLMax = (Vdc-12)/0.022
22mA outside the measuring range
Models HD4801T..
EM-HD4801ET Relative Humidity 4…20mA (0…100%RH), RL< 500Ω
22mA outside the measuring range
Models
EM-HD48V01T.. EM-HD48V01ET.. Relative Humidity 0…10Vdc (0…100%RH), RL > 10kΩ
11Vdc outside the measuring range
Models
HD48S01T.. EM-HD48S01ET.. Relative Humidity Only RS485 with MODBUS-RTU protocol
Models
HD4901T.. EM-HD4901ET.. Relative Humidity 4…20mA (0…100%RH), RLMax = (Vdc-12)/0.022
22mA outside the measuring range
Models
HD4817T..
Relative Humidity 4…20mA (0…100%RH), RL < 500Ω
22mA outside the measuring range
Temperature 4…20mA (-20…+80°C), RL < 500Ω
22mA outside the measuring range
Models
EM-HD4817TV..
Relative Humidity 4…20mA (0…100%RH), RL < 500Ω
22mA outside the measuring range
Temperature 4…20mA (0…+60°C), RL < 500Ω
22mA outside the measuring range
Models
EM-HD4817ET..
Relative Humidity 4…20mA (0…100%RH), RL < 500Ω
22mA outside the measuring range
Temperature 4…20mA (-40…+150°C), RL < 500Ω
22mA outside the measuring range
Models
EM-HD48V17T..
Relative Humidity 0…10Vdc (0…100%RH), RL > 10kΩ
11Vdc outside the measuring range
Temperature 0…10Vdc (-20…+80°C), RL > 10kΩ
11Vdc outside the measuring range
Models
EM-HD48V17ET..
Relative Humidity 0…10Vdc (0…100%RH), RL > 10kΩ
11Vdc outside the measuring range
Temperature 0…10Vdc (-40…+150°C), RL > 10kΩ
11Vdc outside the measuring range
Models
EM-HD48S17T.. EM-HD48S17ET
Relative Humidity Temperature Only RS485 with MODBUS-RTU protocol
Models
EM-HD4917T..
Relative Humidity 4…20mA (0…100%RH), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Temperature 4…20mA (-20…+80°C), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Models
EM-HD4917TV..
Relative Humidity 4…20mA (0…100%RH), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Temperature 4…20mA (0…+60°C), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Models
EM-HD4917ET..
Relative Humidity 4…20mA (0…100%RH), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Temperature 4…20mA (-40…+150°C), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Models
EM-HD4877T..
Dew Point 4…20mA (-20…+80°C DP), R
l
< 500Ω
22mA outside the measuring range
Temperature 4…20mA (-20…+80°C), RL < 500Ω
22mA outside the measuring range
Models
EM-HD48V77T..
Dew Point 0…10Vdc (-20…+80°C TD), RL > 10kΩ
11Vdc outside the measuring range
Temperature 0…10Vdc (-20…+80°C), RL > 10kΩ
11Vdc outside the measuring range
Models
EM-HD48S77T..
Dew Point Only RS485 with MODBUS-RTU protocol Temperature
Models
EM-HD4977T..
Dew Point 4…20mA (-20…+80°C DP), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Temperature 4…20mA (-20…+80°C), R
L
Max = (Vdc-12)/0.022
22mA outside the measuring range
Models
EM-HD4877T480
Dew Point 4…20mA (-40…+60°C DP), RL < 500Ω
22mA outside the measuring range
Temperature 4…20mA (-40…+60°C), RL < 500Ω
22mA outside the measuring range
EM-HD 4807T…, EM-HD 48V07T…, EM-HD 48S07T…, EM-HD 4801T…,
EM-HD 48V01T…, EM-HD 4817T…, EM-HD 48V17T…, EM-HD 4877T… EM-HD 48V77T…,
EM-HD 4907T…, EM-HD 4901T…, EM-HD 4917T…, EM-HD 4977T…
Passive or Active Temperature , Relative Humidity, Relative Humidity and Temperature , Temperature and Dew Point TRANSMITTERS
Temperature
TP-29
Models
EM-HD48V77T480
Dew Point 0…10Vdc (-40…+60°C DP), RL > 10kΩ
11Vdc outside the measuring range
Temperature 0…10Vdc (-40…+60°C DP), RL > 10kΩ
11Vdc outside the measuring range
Models
EM-HD48S77T480
Dew Point Temperature Only RS485 with MODBUS-RTU protocol
Models
EM-HD4977T480
Dew Point 4…20mA (-40…+60°C DP), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Temperature 4…20mA (-40…+60°C), RL Max = (Vdc-12)/0.022
22mA outside the measuring range
Power supply and electrical connections
EM-HD48.. EM-HD49..
Power supply 16…40Vdc or 24 Vac ±10% 12…40Vdc
Electrical connections Screw type terminal block, max 1,5mm2, M16 cable gland for input cable
General specifications
Electronics …TV probes working temperature 0…+60°C …TO,…TC Probes working temperature
STANDARD RANGE EXTENDED RANGE
-20…+100°C -40…+150°C
T480 probes working
temperature -40…+60°C
Storage temperature -20…+80°C
electronics protection class IP66
Case dimensions 80x84x44
Table 1 -Accuracy of dew point measurement:
TD °C -20 -10 0 10 20 30 40 60 80
Temperature °C
-20 ≤±1
-10 ≤±1 ≤±1
0 ≤±1 ≤±1 ≤±1 DP LIMIT 10 ≤±3 ≤±1 ≤±1 ≤±1
20 ≤±4 ≤±2 ≤±1 ≤±1 ≤±1
30 ≤±3 ≤±1,5 ≤±1 ≤±1 ≤±1
40
NOT SPECIFIED
≤±2 ≤±1 ≤±1 ≤±1
60 ≤±5 ≤±2,5 ≤±2 ≤±1 ≤±1
80 ≤±4 ≤±2 ≤±1 ≤±1
For example at 20°C a Dew Point value of 0°C DP is measured with an accuracy better than
1°C DP.
Installation notes
To fi x the probe inside a ventilation duct, a pipe , etc., use for example the EM-HD9008.31 fl ange, a
PG16 metal cable gland (Ø10…14mm) or a 3/8” universal biconical connection.

Electrical connections
EM-HD48.. series with analog output
Power the instrument as shown in the below connection schemes, the power supply terminals
are marked as +Vcc and GND.
Depending on the model, the output signal is available between:
• Ta and AGND terminals for the transmitters of the EM-HD4807T..and EM-HD48V07T… series.
• RH% and AGND terminals for the transmitters of the EM-HD4801T.. and EM-HD48V01T.. series.
• RH% and AGND, Ta and AGND terminals for the transmitters of the EM-HD4817T.. and
HD48V17T.. series.
• DP and AGND, Ta and AGND terminals for the transmitters of the EM-HD4877T.. and EM-HD48V77T..
series.
Vac/dc
Power supply
Vac/dc
Power supply
+Vdc
+Vdc +Vdc
+Vdc
Vac/dc
Power supply
Vac/dc
Power supply
EM-HD48…series with RS485 output
Connect the instrument as shown in the below connection schemes, the power supply
terminals are marked as +Vcc and GND. +Vdc
Thanks to RS485 output, several instruments can be connected to form a network. The
instruments are connected in a sequence through a shielded cable with twisted pair for
signals and a third wire for the mass.
1 2 3 4 5
6 7 8 9
RS232C
RS232C / RS485
+5Vdc
GND
ID = 1 ID = 2
220Ω 220Ω
Shield Lmax = 1200m Shield
390Ω
390Ω
D1
D0
D1 D0 D1 D0
Lmax = 5m (USB)
USB / RS485
Lmax = 15m (RS232C)
GND GND
RS 485 RS 485
+Vcc GND + – +Vcc GND + –
+ +
Line
Termination
Line
Termination
RS232C/RS485 or USB/RS485 converter
Line termination must be set at the two network ends. To polarize the line during nontransmission
periods, resistors are connected between signal and power supply lines.
The maximum number of devices that can be connected to the (Bus) line RS485 depends on
the load characteristics of the devices to be connected.
The standard RS485 requires that the total load does not exceed 32 Unit Loads. The load of a
HD48S.. transmitter is equal to ¼ of the unit load.
If the total load is more than 32 unit loads, divide the net in segments and insert a signal
repeater between one segment and the next one. At the beginning and at the end of each
segment a line termination must be connected.
The instrument has a built in line termination that can be connected or removed through a
short jumper placed next to the terminal block. If the instrument is the last or the fi rst device
of a network group, connect the termination placing the short jumper between the “RT” and
“240 ohm” indications. If the instrument is not at the end of a network group, remove the
termination placing the short jumper between the “RT” and “OPEN” indications.
GND
RS 485
+Vcc GND + –
1 2 3 4 5
OUTPUT
OPEN
RT
240 ohm N=0
N=
ADDRESS
Termination connected
GND
RS 485
+Vcc GND + –
1 2 3 4 5
OUTPUT
OPEN
RT
240 ohm N=0
N=
ADDRESS
Termination disconnected
MODBUS
mode
selected
MODBUS
mode
selected
The cable shield must be connected to both line 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 baud rate and cable characteristics. Typically, the
maximum length is 1200m. The data line must be kept separated from any power lines in
order to prevent interferences on the transmitted signal. For connection to a PC, a RS232/
RS485 or a USB/RS485 converter must be used. To operate with the MODBUS-RTU protocol be sure that the ADDRESS short jumper is between “ADDRESS” and “N=” indications.
Each transmitter of the network is univocally identifi ed by an address. The address must be
between 1 and 247. There must not be any other transmitters connected with the same
address. The address must be confi gured before connecting the instrument to the network.
To set the instrument address use the EM-HD48STCAL kit. The kit includes the RS48 cable with
built in USB/RS485 adapter and a CD-ROM for Windows® operating systems. To confi gure the
instrument it is necessary to move the ADDRESS short jumper between the “ADDRESS” and
“N=0” indications to select the setup mode. After the confi guration, move the short jumper
back between the “ADDRESS” and “N=” indications.
In MODBUS mode it is possible to read the measured values by the instrument through the
04h functioning code (Read Input Registers). Table 2 represents the available quantities with
its relative register address.
Table 2 – Modbus Registers
Address Quantities Format
0 Temperature in °C (x10) Complete 16 bit
1 Temperature in ° (x10) Complete 16 bit
2 Relative Humidity in % (x10) Complete 16 bit
3 Dew Point in °C (x10) Complete 16 bit
4 Dew Point in °F (x10) Complete 16 bit
5
State register
Bit 0 = 1 temperature measure in error
Bit 1 = 1 relative humidity measure in error
Bit 2 = 1 dew point temperature calculation in error
Bit 3 = 1 error in data confi guration
Complete 16 bit
EM-HD49.. series
Follow the connection schemes shown below, the maximum load resistance that can be
connected to each 4…20mA output depends on the power supply Vcc applied, according to
the relation:
RLMax = (Vdc-12)/0.022, e.g. if Vdc=24Vdc the max load is RLMax =545 ohm.
Relative humidity probe calibration
The EM-HD48.. and EM-HD49.. transmitters are supplied factory calibrated and ready to use. If
necessary, it is possible to calibrate the relative humidity sensor using the saturated salt
solutions EM-HD75 (75% RH saturated salt solution) and EM-HD33 (33% RH saturated salt solution)
and connecting the instrument to the PC using the HD48TCAL kit.
The EM-HD48TCAL kit includes the CP27 with incorporated convertor USB/RS232 for the
transmitters connection to the PC and a CD-ROM for Windows operating systems, that guides
the user in the relative humidity probe calibration procedure.
For RS485 output models use the EM-HD48STCAL. The kit includes the RS48 with incorporated
convertor USB/RS232 for the transmitters connection to the PC and a CD-ROM for Windows
operating systems, that guides the user in the relative humidity probe calibration procedure.
To calibrate the instrument it is necessary to move the ADDRESS short jumper between the
“ADDRESS” and “N=0” indications to select the setup mode. After the calibration, move the
short jumper back between the “ADDRESS” and “N=”

Ordering code examples
EM-HD4801TV: Wall mounting digital active relative humidity transmitter.
Relative humidity range 0…100%RH.
Analog output: 4…20mA (0…100%RH).
Probe working range -20…+80°C. Power supply 16…40Vdc or 24Vac.
EM-HD4917TO1: Digital passive (current loop) temperature and relative humidity transmitter for
duct mounting. AISI304 steel probe, diameter 14mm and stem length 135mm, joined to
the electronics enclosure.
Relative humidity range 0…100%RH, temperature range -20…+80°C.
Analog outputs: 4…20mA (0…100%RH) for RH and 4…20mA (-20…+80°C) for temperature.
Probe working range -20…+80°C. Power supply 12…40Vdc.
EM-HD4817TC25L: Digital active temperature and relative humidity transmitter with LCD display.
AISI304 steel probe, diameter 14mm and stem length 335mm, connected to the electronics
enclosure through a 5m cable.
Relative humidity range 0…100%RH, temperature range -20…+80°C.
Analog outputs: 4…20mA (0…100%RH) for RH and 4…20mA (-20…+80°C) for temperature.
Probe working range -20…+80°C. Power supply 16…40Vdc or 24Vac.
EM-HD48V17ETC25: Digital active temperature and relative humidity transmitter, extended range.
AISI304 steel probe, diameter 14mm and stem length 335mm, connected to the electronics
enclosure through a 5m cable.
Relative humidity range 0…100%RH, temperature range -40…+150°C.
Analog outputs: 0…10V (0…100%RH) for RH and 0…10V (-40…+150°C) for temperature.
Probe working range -40…+150°C. Power supply 16…40Vdc or 24Vac.
EM-HD48S17TC25L: Digital active temperature and relative humidity transmitter with LCD display.
AISI304 steel probe, diameter 14mm and stem length 335mm, connected to the electronics
enclosure through a 5m cable.
Relative humidity range 0…100%RH, temperature range -20…+80°C.
Only RS485 output with MODBUS-RTU protocol. Probe temperature working range
-20…+80°C. Power supply 16…40Vdc or 24Vac.
EM-HD4877TO2: Digital active temperature and dew point transmitter for duct mounting. AISI304
steel probe, diameter 14mm and stem length 135mm, joined to the electronics enclosure.
Dew point range -20…+80°C DP, temperature range -20…+80°C.
Analog outputs: 4…20mA (-20…80°C DP) for DP and 4…20mA (-20…+80°C) for temperature.
Probe working range -20…+80°C. Power supply 16…40Vdc or 24Vac.
HD4977TO2: Digital passive (current loop) temperature and dew point transmitter for duct
mounting. AISI304 steel probe, diameter 14mm and stem length 335mm, joined to the
electronics enclosure.
Dew point range -20…+80°C DP, temperature range -20…+80°C.
Analog outputs: 4…20mA (-20…+80°C DP) for DP and 4…20mA (-20…+80°C) for temperature.
Probe working range -20…+80°C. Power supply 12…40Vdc.
Accessories
EM-HD48TCAL: The kit includes the CP27 connection cable with built-in USB/RS232 converter
and CD-ROM for Windows operating systems that guides the user in the relative humidity
probe calibration procedure. The cable is complete of USB connector on the PC side
and a COM AUX connector on the instrument side. The kit is suitable only for analog
output models.
EM-HD48STCAL: The kit includes the RS48 cable with built-in USB/RS485 converter and CD-ROM
for Windows operating systems that guides the user in the relative humidity probe calibration
procedure. The cable is complete of USB connector on the side of the PC and of 3
separate wires on the instrument part. The kit is suitable only for RS485 output models.
RS48: Cable for RS485 serial connection with buit-in USB/RS485 converter.
CP27: Connection/converter cable from COM AUX serial port to USB.
EM-HD75: 75% RH saturated solution for the verifi cation of the relative humidity sensor, complete
of screw adaptors for probes with Ø 14mm and Ø 26mm.
EM-HD33: 33% RH saturated solution for the verifi cation of the relative humidity sensor, complete
of screw adaptors with Ø 14mm and Ø 26mm.
EM-HD9008.31: Wall fl ange with cable gland to fi x Ø 14mm probes.
PG16: AISI304 steel cable gland for Ø 14mm probes.
P6: 10μ sintered stainless steel protection for Ø 14mm probes.
P7: 20μ PTFE protection for Ø 14mm probes.
P8: Stainless steel grid 20μ and Pocan for Ø 14mm probes.

 

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Manuals and Brochures here.  

HD4807T_4877T_4907T.pdf

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