Vemer FHT Series User manual

Termoregolatori
Digitali
FHT ...
Manuale d’uso
User Manual Digital Heat Regulators

English
Table of contents
■Safety instructions Page 30
■Technical specifications Page 30
■Device description Page 32
■Wiring Page 33
■Glossary Page 33
■Operation Page 38
■Setting regulation parameters Page 38
■Parameter menu Page 40
■Error messages Page 50
■Serial communication Page 50
■Reference standards Page 51
■Dimensions and wiring diagrams 33x75 mm Page 52-53
■Dimensions and wiring diagrams 4-DIN Page 54-55
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User Manual – Thermoregulator FHT

English
SAFETY INSTRUCTIONS
■ During the installation and operation of the device observe the following
instructions:
1) Device must be installed by a qualified person
2) To install device, carefully respect wiring diagrams
3) Do not power or connect the device if any part of it is damaged
4) Before making contact with terminals, ensure that conductors to be
connected to the device are not live
5) Connection wires must be able to resist maximum operating temperature
(Tmax), calculated by adding maximum ambient temperature (Ta) estimated
+ 20° C (Tmax = Ta +20°C)
6) The device guarantees an isolation factor between low-voltage sections
(250 V) and very low-voltage sections
7) If any external switches are connected to the device, minimum isolation
of 250 V AC at operating temperature must be guaranteed or they must be
protected with isolation of equal value
8) Contacts: all type 1C (EN 60730-1 and variations)
9) The device does not require maintenance
TECHNICAL SPECIFICATIONS
■This series of digital temperature thermoregulators satisfies the basic requirements
of thermoregulation.
They may be used as heating or cooling controllers or as maximum/minimum alarms.
■Two models designed for probe input:
-PTC temperature probes
(Positive Temperature Coefficent)-Ni100, Pt100 FHT
-TC Thermocouples – J, K, L, R, S, T, E, N FHT
-Linear probes FHT
-NTC temperature probes (Negative Temperature Coefficent) FHT NTC
• For each individual model, probe input can be configured by keyboard
• Models FHT NTC have two probe inputs so that the measuring of two temperatures
can be displayed alternately by opening and closing an outside source connected to
the device
• Available in versions with 1 or 2 changeover contact relays
• Thermoregulators with 3 seven-segment digits plus decimal point led display
• Relay-on signalling LED
• T2-reading warning LED (only models FHT NTC-2DA)
• Display Range: -99 ÷ +999 °C
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• Display resolution: 0,1 °C (-9,9 ÷ +99,9 °
C) and 1 °C (< -9,9 °C and > +99,9 °C)
• Accuracy: ± 0,5 % of scale limit value ±1 digit
(at ambient temperature 23 °C)
• Sampling time: 0,5 s
• Digital configuration of parameters:
- Set-point
- Differential
- Dead band
- Timing of output activation
- Digital-input operation and delay
- Alarm/Buzzer start delay
- Probe calibration OFFSET
- Reading Resolution
- Temperature measurement unit
- Measurement display filter (update speed)
- Type of probe input
- Password
- Operation mode (regulation):
— ON/OFF Direct and/or Reverse action with or without Dead Band
— PWM, Direct, Reverse and Dead Band action
— ALARM
— Cooling Mode
— Special Mode
• 2 independent set-points
• Outputs: 1 or 2 changeover contact relays 8A/250 V AC1
• Analog output (excluding model FHT NTC): 0 ÷ 10 V
(applicable for power supply >/=15 V AC/DC), 4 ÷ 20 mA
• Optoisolated serial communication output RS 485 (MODBUS communication protocol)
• Digital input: 1 with configurable-function external consent external alarm, ON/OFF
regulation, selection of probe to be displayed, set-point switching, Direct/Reverse
switching,...)
• Acoustic and visual alarm system for: external alarm (from digital input), probe alarm
(malfuction), minimum or maximum alarm
• Infrared receiver with RC-5 protocol (excluding model FHT NTC-2DA) for remote-
control (accessory available separately for remote programming)
• Available for models with: backboard mounting 33x75mm and 4 DIN modular
mounting
• Power supply: See table on next page
• Nominal power: 3VA for 33x75 backboard-mounting models 4,5 VA for 4 DIN
modular-mounting models
• Max. power input: 100 mA at 12 V; 50 mA at 24 V (1 channel)
• Operating Temperature: 0 ÷ +50 °C
• Operating humidity: <80%
• Storage Temperature: -10 ÷ +70 °C (<80% RH)
• Protection degree: front IP54 (IP40 for 4 DIN model)
terminals IP20
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OK
English
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User Manual – Thermoregulator FHT
Backpanel 33x75 mm
Code Model Power (*) Relay n° Analog Digital Infrared
output input receiver
VM666500 FHT 1P3D 12÷24V AC/DC 1 YES YES YES
VM667300 FHT 2P3D 12÷24V AC/DC 2 YES YES YES
VM668100 FHT NTC-2P3D 12÷24V AC/DC 2 NO YES YES
4-DIN version
Code Model Power (*) Relay n° Analog Digital Infrared
output input receiver
VM669900 FHT 1DA 24/230V AC 1 YES YES YES
VM670700 FHT 2DA 24/230V AC 2 YES YES YES
VM671500 FHT NTC-2DA 24/230V AC 2 NO YES NO
(*) AC powered; frequency 50/60 Hz, power tolerance AC/DC + 10%
DEVICE DESCRIPTION
Display
• 3-digit with decimal point LED display.
Reading range for all models is:
- minimum reading: -99 °C or -9,9 °C
- maximum reading: 999 °C or 99,9 °C
Note: reading resolution is:
0,1°C in -9,9 ÷ 99,9°C range and 1°C in -99 ÷ -10°C and 10 ÷ 99°C
Relay-on signalling LED
• Out 1:
LED remains off if relay one is OFF and on if relay one is ON, flashing if relay one in
OFF position is about to turn ON because of set timing.
• Out 2:
LED remains off if relay two is OFF and on if relay two is ON, flashing if relay two in
OFF position is about to turn ON because of set timing.
Keys
• Parameters are configured using three keys:
To confirm parameters set/viewed.
To increase parameter or move on to next parameter.
To decrease parameter or exit menu.

Set
D
ON
OFF
Set + Diff
Set - Diff
R
ON
OFF
Set
English
WIRING
• Carefully follow all the information in the Safety instructions and Wiring diagrams
sections.
GLOSSARY
Set-point
• The set-point is the reference value where the device cuts in to keep the parameter
controlled at the desired value.
Differential (or hystheresis)
• The differential is the maximum allowable parameter deviation from the set-point
before the device cuts in.
It is usually set in a way as to avoid rapid changes around the set-point which could
cause the device, or the equipment it is connected to, to turn on and off frequently.
Direct action
• When a regulator restricts parameter
increase, it operates in a direct way.
As in a refrigerating system for example:
as temperature increases, the heat
extraction rate produced also increases
in order to lower the temperature
“Reverse” action
• When a regulator tends to restrict
parameter decrease, it operates in
reverse.
For example a decrease in temperature
in a heating system corresponds to an
increase of heat production.
Neutral zone or Dead band
• Indicates an interval of values spanning
above and below the set-point, in which
the parameter regulated can change
without having to activate any output.
It is usually used in devices which, due to substantial system inertia, the set-
point can be exceeded even after the equipment is switched off, or to avoid the
overlapping of heating and cooling actions.
Reverse Mode
Temperature
Direct Mode
Temperature
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Set - Diff (R) - ZN
R
ON
OFF
Set
D
Set + Diff (D) + ZN
ZN ZN
Set 1
D
ON
OFF
Diff. 1
OUT 1
Set 1
D
ON
OFF
Diff. 1
OUT 1
D
OUT 2
Set 1
R
ON
OFF
Diff. 1
OUT 2
R
OUT 1
Set 1
R
ON
OFF
Diff. 1
OUT 1
Set - Diff (R) - ZN
R
ON
OFF
Set
D
Set + Diff (D) + ZN
ZN ZN
English
Dead band Mode
Temperature
PWM Mode
Temperature
Mode PRO=0
1 output 2 outputs
Mode PRO=1
1 output 2 outputs
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No output is activated within
the dead band; outside
the dead band the device
operates by direct action
if the parameter controlled
increases and by reverse
action if it decreases.
PWM operating mode
(time-controlled proportionate)
• Dead-band operation
featuring relays activated
periodically by impulse
(settable timing, see Output
menu).
The PWM mode modulates
the power based on the
position of the parameter
within the differential (power
increases as deviation from
set-point increases).
Warning: Not recommended for use with compressors, as this would cause
short start/stop periods.
Direct operating mode [PRO=0]
• When in this mode, all outputs
operate in direct.
Set-point 1 [ST1] and
differential 1 [DF1] must be
assigned values.
Hysteresis is to the right of
the set-point.
If both outputs are used, the
hysteresis of each output is
equal to half of the differential.
In this case output 1 will turn on when the parameter measured reaches value
[ST1]+[DF1]/2; output 2 will turn off on reaching this value.
Reverse
operating mode [PRO=1]
• When in this mode, all outputs
operate in reverse.
Set-point 1 [ST1] and
differential 1 [DF1] must be
assigned values.
Hysteresis is to the left of the
set-point.

Set 1
R
ON
OFF
Diff. 1
OUT 1
ZN
Set 1
R
ON
OFF
Diff. 1
OUT 1
D
Diff. 1
OUT 2
ZN ZN
Set 1
R
ON
OFF
Diff. 1
OUT 1
ZN
Set 1
R
ON
OFF
Diff. 1
OUT 1
D
Diff. 1
OUT 2
ZN ZN
English
Mode PRO=2
1 output 2 outputs
Mode PRO=5
1 output 2 outputs
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User Manual – Thermoregulator FHT
If both outputs are used, the hysteresis of each output is equal to half of the
differential. In this case output 1 will turn on when the parameter measured reaches
the value [ST1]-[DF1]/2; output 2 will turn off on reaching this value.
Dead-band operation mode [PRO=2]
• When in this mode output 1 operates in reverse and output 2 in direct.
It is necessary to configure parameters set-point 1 [ST1], differential 1 [DF1] and
dead band [DBN], which typify both outputs.
The regulator will tend to keep the parameter within the dead band. Outside the dead
band output 2 will turn on if the parameter tends to increase; conversely output 1
will turn on if the parameter tends to decrease. If only one output is present, it will
operate in reverse, with the hysteresis to the left of the value [DBN].
PWM operating mode [PRO=5]
• The regulation logic of this operating mode is the same as that of the dead band
operating mode.
It is therefore necessary to configure parameters set-point 1 [ST1], differential 1
[DF1] and dead band [DBN], which typify both outputs. When in this operating mode,
relays are activated by impulses with the timing given by value [TCL] (see output
menu).
During that period the relay remains on for a variable length of time that is
proportionate to parameter deviation from the set-point (considering the dead band
when present). Beyond the differential value, the relay remains active 100% of the
time.

Set 1
D
ON
OFF
Diff. 1
OUT 1
Set 1
D
ON
OFF
Diff. 1
OUT 1
D
OUT 2
Set 2
R
ON
OFF
Diff. 2
OUT 2
R
OUT 1
Set 2
R
ON
OFF
Diff. 2
OUT 1
Set 1
D
ON
OFF
Diff. 1
OUT 1
Set 1
D
ON
OFF
Diff. 1
OUT 1
D
OUT 2
Set 2
D
ON
OFF
Diff. 2
OUT 1
Set 2
D
ON
OFF
Diff. 2
OUT 1
D
OUT 2
English
Digital
input
open
Digital
input
closed
Digital
input
open
Digital
input
closed
Mode PRO=7
1 output 2 outputs
Mode PRO=6
1 output 2 outputs
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Operating mode with Direct/Reverse change-over
from digital input [PRO=6]
• When in this mode both outputs operate in direct (with set-point 1 and differential
1) or both in reverse (with set-point 2 and differential 2) depending on digital input
status.. More precisely, in direct if the digital output is open and in reverse if it is
closed. Operating functions are the same as in modes 0 and 1. Therefore both set-
points [ST1] and [ST2] and both differentials [DF1] and [DF2] must be configured.
Direct operating mode with set-point and differential change-over
from digital input [PRO=7]
• When in this mode both outputs operate in direct, with set-point 1 /differential 1
or set-point 2/differential 2) depending on digital input status. More precisely, with
set-point 1/differential 1 if the digital input is open and set-point 2/differential 2 if it
is closed. Operating functions are the same as in mode 0. Both set-points [ST1] and
[ST2] and both differentials [DF1] and [DF2] must be configured.

Set 2
R
ON
OFF
Diff. 2
OUT 2
R
OUT 1
Set 2
R
ON
OFF
Diff. 2
OUT 1
Set 1
R
ON
OFF
Diff. 1
OUT 2
R
OUT 1
Set 1
R
ON
OFF
Diff. 1
OUT 1
Set 1
R
ON
OFF
Diff. 1
OUT 1
Set 1
R
ON
OFF
Diff. 1
OUT 1
D
Diff. 2
OUT 2
ON
OFF
Set 2
English
Mode PRO=8
1 output 2 outputs
Mode PRO=9
1 output 2 outputs
Digital
input
open
Digital
input
closed
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Reverse operating mode with set-point and differential change-over
from digital input [PRO=8]
• When in this mode both outputs operate in reverse, with set-point 1 /differential 1 or
set-point 2/differential 2, depending on the status of the digital input. More precisely,
with set-point 1/differential 1 if the digital input is open and set-point 2/differential 2
if it is closed.
Operating functions are the same as in mode 1. Therefore both set-points [ST1] and
[ST2] and both differentials [DF1] and [DF2] must be configured.
Operating mode with outputs 1 and 2 respectively in reverse with
set-point 1 and diff.1 and direct with set-point 2 and diff. 2 [PRO=9]
• When in this mode output 1 operates in reverse and output 2 in direct.
It is necessary to configure set-points 1 [ST1] and differential 1 [DF1] for output 1,
and set-point 2 [ST2] and differential 2 [DF2] for output 2.
Operating functions are the same as in modes 0 and 1.
If only one output is present it will operate in reverse.
Alarm operating mode [PRO=10]
• When in this mode output 1 operates in reverse (with dead band) whilst output 2 is
reserved for the alarm.. It is necessary to configure set-point 1 [ST1], differential 1

Set 1
LOA
DFA
HIA
DFA
English
Mode PRO=10
Alarm output
Alarm ON
Alarm OFF
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[DF1] and dead band [DB1] for output
1, and all parameters on the alarm menu
for output 2. The maximum alarm trips
when the value [ST1]+[HIA] is reached
and is disengaged on reaching value
[ST1]+[HIA]-[DFA]. The minimum alarm
trips when the value [ST1]-[LOA] is
reached and is disengaged on reaching
value [ST1]-[LOA]+[DFA].
When only one output is provided, it will be reserved for the alarm with the same
functions.
OPERATION
Normal operation
Operation when parameters are not being programmed/configured.
When in this status, the device effects regulation based on the temperature
measured and the parameters set. The information displayed is:
• Temperature measured by the sensor
• Status of output OUT1 and, in devices with two outputs, OUT 2
SETTING REGULATION PARAMETERS
There are two types of programming for regulation parameters:
- Simple programming
- Advanced programming
Note: to restore default factory-set values, turn on the device while
pressing the “OK” key.
Simple programming
To change parameters in the Regulation menu [REG] only. This programming is
accessed by pressing the“OK” key.
Depending on the selected operating mode, the following parameters can be
configured (see System menu [SYS]):
– set, differential, regulation ON/OFF, minimum sensor reading, maximum sensor
reading
Parameter labels can be scanned in a circular motion by using the “up” (▲) key. To
exit the menu and return to normal operation, press the “down” (▼) key at any time

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User Manual – Thermoregulator FHT
(which occurs automatically if no key is pressed for at least 40 s). To switch from
parameter label reading to the reading of the relevant numeric value, press the “OK”
key.
To change a parameter:
- from label or value reading, hold the “OK” key pressed for at least three seconds.
- the display will begin to flash the parameter value.
- use the “up” (▲) and “down” (▼) keys respectively to increase or decrease said
value.
- press the “OK” key to confirm the change and exit (the display will stop
flashing).
Note: if no key is pressed within 40 seconds, the device will quit parameter
configuration and no changes will be stored.
During the display and change of parameters the device will continue
operating with the previous settings.
If “password 1” is enabled (access password for the protection of settings - see
system menu), the display will read “- - - ” when the “OK” key is pressed from
normal status.
To proceed with parameter configuration, enter the previously set password (a
numeric value from 0 to 255) using the “up” (▲) and “down” (▼) keys and then
press “OK” to confirm.
If the password entered is correct the regulation menu will appear; otherwise normal
status will return.
Advanced programming
To enter advanced programming from normal status, press the “up” (▲) and
“down” (▼) keys simultaneously for at least 3 seconds.
Note: to restore factory-set default values, turn on the device while
pressing the “OK” key.
These parameters are classified by type into nine menus:
1) Regulation (indicated by label [REG]): set-point, differential, dead band
2) Output (indicated by label [OUT]): timing of output activation, timing of
PWM cycle
3) Digital input (indicated by the label [ING]): function, delay time
4) Alarm (indicated by label [ALR]): probe alarm output status, minimum/maximum
shift, differential, delay time, buzzer on/off
5) Display (indicated by label [DSP]): set-point limits, probe offset, resolution,
measurement unit, reading filter
6) Sensor (indicated by label [SNS]): sensor type, sensor parameters
7) System (indicated by label [SYS]): password, change enabling, operating mode

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User Manual – Thermoregulator FHT
8) Analog output (indicated by label [ANG]): type of analog output
9) Advanced (indicated by label [ADD]): dependency, type, insertion,
differential/logic
All the parameters within the nine menus and their corresponding values, are listed
in the following section.
- To scan the nine menus in sequence use the “up” (▲) key
- To enter the selected menu press the “OK” key
- Configurable parameter labels can be scanned within each menu by pressing
the “up” (▲) key; to view a parameter value press “OK” (to view parameter label
again press the “OK” key one more time).
- To change the parameter value, hold the “OK” key pressed for at least three
seconds.
- The parameter value will begin flashing: increase/decrease using the “up” (▲) and
“down” (▼) keys respectively.
- To confirm the change press “OK”.
The parameter will stop flashing and the new value will be displayed
- It is possible to return to normal operation at any time by pressing the “down” (▼)
key (or not pressing any key for at least 40 seconds)
Note: if when configuring parameters no key is pressed within 40 seconds
, the parameter label will be displayed again and none of the changes
entered will be saved.
Note: During the display and change of parameters the device will continue
operating with the previous settings.
If “password 2” has been enabled (access password for the protection of
settings - see system menu), the display will read “- - - ” when the “up”
(▲) and “down” (▼) keys are simultaneously pressed for three seconds from
normal status.To proceed with parameter configuration, enter the password
previously set (a numeric value from 0 to 255) using the “up” (▲) and “down”
(▼) keys and press “OK” to confirm.
If the password is correct the first menu label will appear, otherwise normal status
will return.
PARAMETER MENU
To simplify device programming, parameters have been classified into the following
various menus:
— [REG] regulatation menu
— [OUT] output menu

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— [ING] external input menu
— [ALR] alarm menu
— [DSP] view menu
— [SNS] sensor menu
— [SYS] system menu
— [ANG] analog output menu
— [ADD] special parameter setting me
Parameter description
The tables show parameter labels in the same order in which they appear in the
various menus of the device.
[REG] regulation menu
Configurable Parameter
parameter Description unit value default notes
labels min max
ST1 set-point 1 degrees LO1 HI1 20.0 (1)
DF1 set-point 1 differential degrees 0.1 100 2.0
ST2 set-point 2 degrees LO2 HI2 30.0 (2)
DF2 set-point 2 differential degrees 0.1 100 2.0 (2)
DBN neutral zone (dead band) degrees 0 100 2.0 (2)
I-O regulation on/off - on (3)
HIO maximum value measured
by sensor 0 degrees --- (4)
LOO minimum value measured
by sensor 0 degrees --- (4)
HI1 maximum value measured
by sensor 1 degrees --- (4)
LO1 minimum value measured
by sensor 1 degrees --- (4)
Note:
(1) for values LO1/2 and HI1/2 see display menu [DSP]
(2) parameter is active only if it applies to the operating mode
(3) turns regulation on/off from keypad if ON there is normal operationif OFF:
- display reads “OFF”
- relays 1 and 2 take on status as established by parameter [SUI], menu [ING],
respecting the timing of menu [OUT]
(4) Maximum/minimum value read by sensors 0 and 1 is stored in these parameters.
The value can be reset by pressing the OK key for about 3 seconds (which starts a
new parameter updating control)

English
[OUT] output menu
Configurable Parameter
parameter Description unit value default notes
labels min max
ETR relay time-
control activation - 0 0 3 (5)
DON minimum time between
2 starts of same relay min 0 200 0 (6)
TOF minimum ON time
of relay min 0 200 0 (7)
TON minimum OFF time
of relay min 0 200 0 (8)
INI initial delay
from device start min 0 200 0 (9)
TCL PWM cycle time sec 1 200 200 (10)
Note:
(5) this parameter enables the control of times set in DON, TOF, and TON for each
output as follows:
0timing disabled for both relay outputs
1timing enabled only for relay 1 output
2timing enabled only for relay 2 output
3timing enabled for both relay 1 and 2 outputs
(6) this parameter restricts the number of starts per hour for the equipment connected
to the device (parameter frequently used e.g. for compressors)
(7) minimum time in which output must remain ON
(8) minimum time in which output must remain OFF
(9) output activation delay time from reset of the device
(10) the period that can be set for PWM regulation. This reading is displayed only if the
operating mode selected is PRO=5 (see system menu).
[ING] outside input menu
Configurable Parameter
parameter Description unit value default notes
labels min max
TID digital input function - 0 4 0 (11)
DID digital input delay min 0 200 0 (12)
SUI output status with
dig. input enabled (open) - 0 3 0 (13)
Note:
(11) Configurable values are: 0disabled
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1external alarm (with open contact) with “DID” delay time and automatic reset
after alarm goes off.Output status then turns to “SUI”
2manual-reset external alarm (with open contact).
3input acts as switch: device is on when contact is closed and off when contact is
open
4input acts as display change-over between probes S0 and S1 (open contact - S0
probe, closed contact - S1 probe)
Digital input function is excluded when one of the following operating
modes is selected in the system menu [SYS]: mode=6, mode=7 and
mode=8
(12) the delay after which the device responds to a signal received from the digital input
(13) when the digital input is active and “DID” time has elapsed, the output may take on
the following status:
0both relays OFF
1relay 1 ON and relay 2 OFF
2relay 1 OFF and relay 2 ON
3both relays ON
[ALR] alarm menu
Configurable Parameter
parameter Description unit value default notes
labels min max
SUA output status
in probe alarm condition - 0 3 0 (14)
LOA minimum alarm shift degrees 0.1 100 50 (15)
HIA maximum alarm shift degrees 0.1 100 50 (15)
DFA alarm differential degrees 0.1 100 2
TRA alarm activation delay time min 0 200 0
SUO buzzer activation - no yes no (16)
EAC timed alarm message
activation - no yes no (17)
RAR automatic relay reset and min/max
alarm message reset on alarm end - no yes yes (18)
RAA automatic min/max alarm
message reset on alarm end - no yes yes (19)
TRP min/max alarm generation delay
from power-on hours 0 15 0 (20)
Note:
(14) output status when in probe alarm condition (see note n°13)
(15) value to be added or subtracted to the established set-point, respectively for
maximum or minimum alarm
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English
(16) if “yes” both key beep and alarm-condition buzzer are enabled. If “no” both are
disabled
(17) If “yes” the type of alarm is displayed even during timing of the same, if “no” the
type of alarm is displayed only after the timing
(18) if “yes”, at the end of a min/max alarm it will be necessary to dismiss alarm type
reading and reset the relay manually
(19) if “yes”, at the end of a min/max alarm it will be necessary to dismiss alarm type
reading manually (the relay will automatically reset instead)
(20) blocks the generation of max/min alarms for a period
[DSP] view menu
Configurable Parameter
parameter Description unit value default notes
labels min max
LO1 lower limit of set-point 1 degrees -99 HI1 -99
HI1 upper limit of set-point 1 degrees LO1 999 999
LO2 lower limit of set-point 2 degrees -99 HI2 -99 (21)
HI2 upper limit of set-point 2 degrees LO2 999 999 (21)
SOF probe 1 calibration offset degrees -50 +50 0.0 (22)
SIF probe 2 calibration offset degrees -50 +50 0.0 (22)
RIS reading resolution - HI LO HI (23)
UNI temperature measurement unit - C F C (24)
FIL measurement filter - no yes yes (25)
Note:
(21) parameter is active only if it applies to the operating mode
(22) value added to the measure to compensate for an inaccuracy of the same
(23) reading resolution:
0.1 if “HI” or 1.0 if “LO”
(24) Attention: when unit of measurement is changed, parameter settings are not
converted automatically and must be recalibrated.
(25) if the parameter is set to “yes” a moving average of 8 measurement values (i.e. of
about 4 seconds) is calculated, if “no” the average is not calculated
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[SNS] sensor menu
Configurable Parameter
parameter Description unit value default notes
labels min max
TYO sensor type 0 - 0 16 (26)
TY1 sensor type 1 - 12 16 (27)
S01 display of sensor 1 or 2 - S0 S1 S0 (27)
Note:
(26) default parameter and sensor values depend on device model. All sensors available
are listed as follows:
Temperature probes NiPt
sensor type display reading
Pt100 (*) PtE (*)
Ni100 nI
* Device default setting
Thermocouples JK
sensor type display reading
J J
K C
L L
T t
E E
N n
R r
S s
Linear probes
sensor type display reading
0-20mA 020
4-20mA 420
0-1V 0-1
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User Manual – Thermoregulator FHT

English
Temperature probes NTC
sensor type display reading
(**) nt0
(**) nt1
type 4 nt2 (*)
(**) CSt
* Device default setting, which corresponds to the use of temperature probe NTC
code VN870200 (see “Red line” in catalogue under the section Thermoregulation
- temperature probes)
** When using sensors other than “type 4” as noted above (see note *), it is possible
to select one of the three items “nt0, nt1, Cst” corresponding to probes with
different temperature/resistance ratios. In these cases, in order to identify the
type of sensor to be selected, we recommend contacting the Technical Assistance
Service Department directly.
(27) parameter displayed only on models NTC
[SYS] system menu
Configurable Parameter
parameter Description unit value default notes
labels min max
PS1 password 1 - 0 255 0 (28)
PS2 password 2 - 0 255 0 (28)
NEN enables parameter changing - yes no no (29)
PRO operating mode - 0 12 0 (30)
ADR serial address - 1 247 1
COM serial communication
parameters - 0 11 0 (31)
Note:
(28) password is enabled if setting is other than 000
(29) if setting is “yes” all other parameters can be viewed but not changed
(30) the following operating modes are possible:
0 relay output 1 and 2 in direct with set-point 1 and differential
1 (hysteresis to the right of the set-point)
1 relay output 1 and 2 in reverse with set-point 1 and differential
1 (hysteresis to the left of the set-point)
2 dead band with relay output 1 in reverse and relay output 2 in direct, set-point 1
and differential 1
3 same as in mode 0 but with differential centered on set-point
4 same as in mode 1 but with differential centered on set-point
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User Manual – Thermoregulator FHT