PPI HumiTherm-i User manual

Smart
‘Temperature + Humidity’ Indicator
User Manual
HumiTherm-i
Version : Dry-Bulb RTD Pt100, 3-wire
Wet-Bulb RTD Pt100, 3-wire
Version : RTD Pt100, 3-wire for Temperature
DC Linear (Voltage) for Humidity

CONTENTS
User Manual
HumiTherm-i
1. FRONT PANEL LAYOUT 1
2. BASIC OPERATION 2
3. PAGES AND PARAMETERS 5
4. ALARM PARAMETERS FOR TEMPERATURE 7
5. ALARM PARAMETERS FOR RELATIVE HUMIDITY 8
6. ZERO OFFSET PARAMETERS 9
7. UTILITY PARAMETERS 10
8. HARDWARE ASSEMBLY & CONFIGURATIONS 11
9. 16MECHANICAL INSTALLATION
10. ELECTRICAL CONNECTIONS 17
1. FRONT PANEL LAYOUT 21
2. BASIC OPERATION 23
3. PAGES AND PARAMETERS 25
4. ALARM PARAMETERS FOR TEMPERATURE 27
5. ALARM PARAMETERS FOR RELATIVE HUMIDITY 28
6. ZERO OFFSET PARAMETERS 29
7. UTILITY PARAMETERS 30
8. HARDWARE ASSEMBLY & CONFIGURATIONS 31
9. 36MECHANICAL INSTALLATION
10. ELECTRICAL CONNECTIONS 37
For Dry-Wet
For Temp+RH

1
Section 1
The indicator front panel comprises of digital readouts, LED indicators and membrane keys as shown in Figure 1.1 below.
READOUTS
The Upper Readout is a 4 digit, 7-segment bright red LED display and usually displays the Temperature Value in °C or °F
(depending upon the Unit selected). In Program Mode, the Upper Readout displays parameter values.
The Lower Readout is a 4 digit, 7-segment bright green LED display and usually displays Relative Humidity (RH) Value in %.
Upon holding the UP or DOWN key pressed, the Lower Readout shows the Wet-Bulb Temperature in °C or °F. In Program
Mode, the Lower Readout displays prompts for the parameters.
INDICATORS
There are two front panel red LED indicators. The Table 1.1 below lists each LED indicator (identified by the front panel legend)
and the associated status it indicates.
Table 1.1
Indicator Function
Flashes while the Alarm for Temperature Loop is active.
AL1
Flashes while the Alarm for RH Loop is active.
AL2
KEYS
There are four tactile keys provided on the front panel for configuring the indicator and setting-up the parameter values.
The Table 1.2 below lists each key (identified by the front panel symbol) and the associated function.
Table 1.2
User Manual
HumiTherm-i (Dry-Wet)
Figure 1.1
Upper Readout
Lower Readout
Alarm-2 Indicator
ENTER Key
UP Key
DOWN Key
PAGE Key
Alarm -1 Indicator
PPI
HumiTherm-i
AL1 AL2
°C
%RH
FRONT PANEL LAYOUT
Symbol Key Function
Press to enter or exit set-up mode.
DOWN
UP
Press to increase the parameter value. Pressing once
increases the value by one count; keeping pressed speeds
up the change.
Press to decrease the parameter value. Pressing once
decreases the value by one count; keeping pressed speeds
up the change.
PAGE
ENTER Press to store the set parameter value and to scroll to the
next parameter on the PAGE.

2
Table 2.1
Message Error Type Cause
Sensor Open
Under-range
Over-range Dry Bulb Temperature above Max. Range
Dry Bulb Temperature below Min. Range
Dry Bulb Sensor (RTD) Broken / Open
BASIC OPERATIONS
POWER-UP
Upon power-up, all displays and indicators are lit on for approximately 3 seconds. This is followed by the indication of the
indicator model name on the Upper Readout and the firmware version on the Lower Readout, for approximately
1 second.
MAIN DISPLAY MODE
After the Power-up display sequence, the Upper and Lower Readout starts showing the measured Temperature Value in °C or
°F and the Relative Humidity in %RH, respectively. (The Wet-Bulb Temperature can be viewed on the Lower Readout by
holding the UP or DOWN key pressed.) This is called the MAIN Display Mode and this is the one that shall be used most often.
Error Indication for Relative Humidity (RH)
In case of Wet-Bulb sensor (RTD Pt100) open / broken or in cases where the Dry/Wet Temperatures cause an error in RH
calculation, the Lower Readout flashes the Error Messages as listed in Table 2.2 below.
PV ERROR INDICATIONS
The indicator flashes the PV error messages for Temperature and RH Values on Upper and Lower Readout, respectively.
Error Indication for Dry-Bulb Temperature
In case of Dry-Bulb Temperature exceeding the specified Minimum or Maximum Range or in case of input sensor (RTD Pt100)
open / broken; the Upper Readout flashes the Error Messages as listed in Table 2.1 below.
Table 2.2
Message Error Type Cause
Sensor Open
Under-range
Over-range Wet Bulb Temperature above Max. Range
Wet Bulb Temperature below Min. Range
Wet Bulb Sensor (RTD) Broken / Open
RH Error
This error is indicated in the following cases :
• Dry Bulb Temperature above 102.0°C.
• Dry Bulb Temperature below 0.0°C.
• Wet Bulb depression beyond 50.0°C.
Display Freezes
To 100.0%
This error is indicated in the following cases :
• Wet-Bulb Temperature exceeds Dry-Bulb Temperature.
• Computed % RH above 100.0%.
Display Freezes
To 0.0% Computed % RH is below 0.0%.
User Manual
HumiTherm-i (Dry-Wet)
Section 2

3
Note:
For both Dry and Wet Bulb 3-wire RTD sensor input, if the compensating lead is not connected or gets open, the indicator does not indicate
PV error but the measured value is not compensated for the lead resistance.
OPERATOR PAGE AND PARAMETERS
The indicator provides a separate page, called Operator Page, for the purpose of viewing and / or resetting the stored Min. /
Max. values for Dry- Bulb Temperature and %RH. The parameters on this page are available only if the Min. / Max. feature is
Enabled in Page -13 parameter list.
Accessing Operator Page
Step through the following sequence to open the operator page and to adjust the operator parameter values.
1. Press and release PAGE key. The Lower Readout shows (PAGE) and Upper Readout shows (0).
2. Press ENTER key. The Lower Readout shows prompt for the first available operator parameter and the Upper Readout
shows value for the parameter.
3. Use UP / DOWN keys to adjust the value and then press ENTER key to store the set value and scroll to next parameter.
The indicator automatically reverts to MAIN Display Mode upon scrolling through the last operator parameter. Alternatively,
use PAGE key to return to MAIN Display Mode.
The operator parameters are described in Table 2.3. Note that the parameters are presented only if ‘Min / Max Monitoring’
feature is enabled.
Table 2.3
Parameter Description Settings
(Default Value)
View Only
MAXIMUM DRY BULB
TEMPERATURE VALUE
This parameter indicates the Maximum value attained by the Dry-
Bulb Temperature. This is a read only value and is available only if
Min. /Max. monitoring is enabled.
View Only
MINIMUM DRY - BULB
TEMPERATURE VALUE
This parameter indicates the Minimum value attained by the Dry-
Bulb Temperature. This is a read only value and is available only if
Min. /Max. monitoring is enabled.
View Only
MAXIMUM %RH VALUE
This parameter indicates the Maximum value attained by the
Relative Humidity. This is a read only value and is available only if
Min. /Max. monitoring is enabled.
View Only
MINIMUM PEAK OF RH
This parameter indicates the Minimum value attained by the
Relative Humidity. This is a read only value and is available only if
Min. /Max. monitoring is enabled.
User Manual
HumiTherm-i (Dry-Wet)

4
Parameter Description Settings
(Default Value)
0 to 250
(Default : 0)
RESET PASS - CODE
For Resetting the Min. / Max. values, set the reset command to
‘Yes’ and then set this parameter value to the Pass - Code value
stored at Supervisory level on Page-13.
RESET COMMAND
Available only if Min./Max. monitoring is enabled. This feature
clears the current Min. / Max. values and starts afresh monitoring
the Process Values for new Min & Max. (Default : No)
No
Yes
User Manual
HumiTherm-i (Dry-Wet)

5
The various parameters are arranged in different groups, called PAGES, depending upon the functions they represent. Each
group is assigned a unique numeric value, called PAGE NUMBER, for its access.
The parameters are always presented in a fixed format: The Lower Readout displays the parameter prompt (Identification
Name) and the Upper Readout displays the set value. The parameters appear in the same sequence as listed in their
respective sections.
SET-UP MODE
The Set-up Mode allows the user to view and modify the parameter values. Follow the steps below for setting the parameter
values:
1. Press and release PAGE key. The Lower Readout shows PAGE and the Upper Readout shows page number 0. Refer
Figure 3.1.
2. Use UP / DOWN keys to set the desired PAGE NUMBER.
3. Press and release ENTER key. The Lower Readout shows the prompt for the first parameter listed in the set PAGE and
the Upper Readout shows its current value. If the entered PAGE NUMBER is invalid (contains no parameter list or any
associated function), the indicator reverts to the MAIN Display Mode.
4. Press and release the ENTER key until the prompt for the required parameter appears on the Lower Readout. (The last
parameter in the list rolls back to the first parameter).
5. Use UP / DOWN keys to adjust the parameter value. (The display flashes if UP key is pressed after reaching the maximum
value or DOWN key is pressed after reaching the minimum value).
6. Press and release the ENTER key. The new value gets stored in the indicator’s non-volatile memory and the next
parameter in the list is displayed.
SET-UP MODE : ACCESS AND OPERATION
The Figure 3.1 illustrates the example of altering the value for the parameter ‘Units’.
Notes
1. Each page contains a fixed list of parameters that are presented in a pre-determined sequence. Note however that availability of a few
parameters, called Conditional Parameters, depend upon the settings for some other parameters. For example, the parameter ‘Control
Hysteresis’ for Output-1 is available only if, the set value for the parameter ‘Control Action’ is ‘On-Off’.
2. To exit the set-up mode and return to the MAIN Display Mode, press and release PAGE key.
3. If no key is pressed for approximately 30 seconds, the set-up mode times out and reverts to the MAIN Display Mode.
User Manual
HumiTherm-i (Dry-Wet)
Figure 3.1
Press PAGE
key to enter
Set-up Mode
Use UP/DOWN
key to set the
Page Number
Press ENTER
key to open
the Page
Use UP/DOWN
keys to change
the value
Press ENTER
key to store the value &
move to next parameter
or
Main Display
Mode
Default Page Page Number First Parameter
on Page-13
New Parameter
value
Next Parameter
on Page-13
or
Section 3

6
UnLocking
Repeat the Locking procedure twice for unlocking.
MASTER LOCKING
The indicator facilitates locking all the PAGES (except Operator PAGE) by applying Master Lock Code. Under Locking, the
parameters are available for view only and cannot be adjusted. The Master Lock, however does not lock the operator
parameters. This feature allows protecting the rather less frequently used parameters against any inadvertent changes while
making the frequently used operator parameters still available for any editing.
For enabling / disabling the Lock, step through the following sequence:
Locking
1. Press and release PAGE key while the indicator is in the MAIN Display Mode. The Lower Readout shows PAGE and the
Upper Readout shows 0.
2. Use UP / DOWN keys to set the Page Number to 123 on the Upper Readout.
3. Press and release ENTER key. The indicator returns to the MAIN Display Mode with the Lock enabled.
The Figure 3.2 below illustrates the Locking procedure.
User Manual
HumiTherm-i (Dry-Wet)
Figure 3.2
or
MAIN Display
Mode
Default Page Locking Code MAIN Display
Mode
Press PAGE
key to enter
Set-up Mode
Use UP/DOWN
key to set the
‘Locking Code’
Press ENTER key
to Lock & Return to
Main Mode

7
TEMPERATURE ALARM INHIBIT
Yes
The Alarm activation is suppressed until the Temperature Value is
within Alarm limits from the time the indicator is switched ON. This
allows suppressing the Alarm during the start-up Alarm
conditions.
No
The Alarm is not suppressed during the start-up Alarm conditions.
TEMPERATURE ALARM LOGIC
Select ‘Normal’ if Alarm output is to activate an Audio / Visual
alarm. Select ‘Reverse’ if Alarm output is to Trip the system. Reverse
Direct
(Default : Direct)
Table 4.1
ALARM PARAMETERS FOR TEMPERATURE
Visit www.ppiindia.net for technical notes on ALARM for detailed understanding of the parameters / terminologies used for
describing the Alarm parameters in this section.
The Alarm parameters for Temperature Loop are grouped on PAGE-10. Refer Table 4.1 for parameter description and
settings.
Parameter Description Settings
(Default Value)
-50.0 to 150.0°C or
-58.0 to 302.0°F
(Default :
For Process Low : -50.0
For Process High : 150.0)
(Default : 0.2)
0.1 to 25.0 °C or °F
TEMPERATURE ALARM TYPE
None
Disable the Alarm .
Process Low
The Alarm activates when the Temperature Value equals or falls
below the ‘Alarm Setpoint’ value.
Process High
The Alarm activates when the Temperature Value equals or
exceeds the ‘Alarm Setpoint’ value.
TEMPERATURE ALARM SETPOINT
This parameter sets the Process High or Process Low limit for
Alarm.
TEMPERATURE ALARM HYSTERESIS
This parameter sets a differential (dead) band between the ON
and OFF Alarm states. Keep it large enough to avoid frequent
switching of the Alarm relay.
(Default : None)
Process High
None
Process Low
(Default : Yes)
No
Yes
User Manual
HumiTherm-i (Dry-Wet)
Section 4

8
%RH ALARM INHIBIT
Yes
The Alarm activation is suppressed until the %RH Value is within
Alarm limits from the time the indicator is switched ON. This allows
suppressing the Alarm during the start-up Alarm conditions.
No
The Alarm is not suppressed during the start-up Alarm conditions.
%RH ALARM LOGIC
Select ‘Normal’ if Alarm output is to activate an Audio / Visual
alarm. Select ‘Reverse’ if Alarm output is to Trip the system.
Reverse
Direct
(Default : Direct)
Parameter Description Settings
(Default Value)
0.0 to 100.0%
(Default :
For Process Low : 0.0
For Process High : 100.0)
(Default : 0.2)
0.1 to 25.0%
%RH ALARM TYPE
None
Disable the Alarm.
Process Low
The Alarm activates when the %RH Value equals or falls below the
‘Alarm Setpoint’ value.
Process High
The Alarm activates when the %RH Value equals or exceeds the
‘Alarm Setpoint’ value.
%RH ALARM SETPOINT
This parameter sets the Process High or Process Low limit for
Alarm.
%RH ALARM HYSTERESIS
This parameter sets a differential (dead) band between the ON
and OFF Alarm states. Keep it large enough to avoid frequent
switching of the Alarm relay.
(Default : None)
Process High
None
Process Low
(Default : Yes)
No
Yes
Table 5.1
Visit www.ppiindia.net for technical notes on ALARM for detailed understanding of the parameters / terminologies used for
describing the Alarm parameters in this section.
The Alarm Parameters for %RH Loop are grouped on PAGE-11. Refer Table 5.1 for parameters description and settings.
ALARM PARAMETERS FOR RELATIVE HUMIDITY
User Manual
HumiTherm-i (Dry-Wet)
Section 5

9
ZERO OFFSET FOR %RH VALUE
This value is algebraically added to the measured %RH value to
derive the final PV that is displayed and compared for Alarm.
Final PV = Measured PV + Offset
ZERO OFFSET FOR TEMP. VALUE
This value is algebraically added to the measured temperature
value to derive the final PV that is displayed and compared for
Alarm.
Final PV = Measured PV + Offset
-25.0 to +25.0%
(Default : 0.0)
-25.0 to +25.0°C
(Default : 0.0)
ZERO-OFFSET PARAMETERS
The Zero-Offset Parameters are grouped on PAGE-12 and allow the user to set the Zero-Offset for Temperature and the
Relative Humidity (RH) values. Refer Table 6.1 for parameter description and settings.
Table 6.1
Parameter Description Settings
(Default Value)
User Manual
HumiTherm-i (Dry-Wet)
Section 6

10
SUPERVISORY PARAMETERS
The Supervisory Parameters are grouped on PAGE-13. These parameters allow Unit Selection for Temperature Value,
Enabling / Disabling Min/Max monitoring and settings for Serial Communication. Refer Table 7.1 for parameter description
and settings.
Table 7.1
Unique numeric code assigned to the indicator for identification by
the host to read or write %RH Loop parameters.
ID NUMBER FOR RH LOOP
ID NUMBER FOR TEMPERATURE LOOP
Unique numeric code assigned to the indicator for identification by
the host to read or write Temperature Loop parameters.
PASSWORD FOR RESETTING
PV HIGH - LOW
This parameter allows protection against inadvertent resetting of
Min/Max values. That is, the reset command is executed only if the
operator sets the password that matches with this parameter
value.
Set this parameter value to ‘Yes’ for enabling the Dry-Bulb
Temperature and % RH monitoring for Min/Max values.
DRY-BULB TEMPERATURE AND
% RH MIN / MAX MONITORING
UNIT SELECTION FOR TEMPERATURE
Select Temperature Units in °C or °F.
(Default : )2
1 to 8
(Default : )1
1 to 8
BAUD RATE
Communication speed in ‘Bits per Second’. Set the value to match
with the host baud rate.
(Default : 4800)
Parameter Description Settings
(Default Value)
°C
°F
(Default : )°C
(Default : 0)
0 to 250
(Default : Yes)
No
Yes
User Manual
HumiTherm-i (Dry-Wet)
Section 7

11
HARDWARE ASSEMBLY & CONFIGURATIONS
The Figure 8.1 below shows the indicator outer-case when viewed with indicator front label upright. The indicator outer case is
a rigid plastic enclosure into which the electronics assembly fits. The enclosure in turn fits into the standard DIN size panel
cutout, as described in Section 9 : Mechanical Installation.
Notice the nomenclatures used to identify the various parts as the same are used throughout the sections describing
installation, configuration and electrical connections.
Figure 8.1
UP
UP
Front Label
Pullout Grip
Enclosure
Connection Diagram
Rear Terminals Ventilations
Ratchets
Panel Mounting Clamp
Panel Sealing
Gasket
Bezel
PPI
HumiTherm-i
AL1 AL2
%RH
°C
HumiTherm
1
2
3
4
5
678910
11
12
13
14
15
16
17
18
Pt100
IN P U T 1
OUTPUT 2
+
RH SENSOR
SERIAL
COMMS.
+
SSR
RELAY
N/O
N/C
C
PPI
L
N
AC
DC
SUPPLY
-
Ex
INPUT 2
_
GND
SSR
N/O
C
RELAY
N/C
+
_
OUTPUT 1
ELECTRONIC ASSEMBLY
The electronic assembly can be removed from the plastic enclosure and placed back as described below and illustrated in
Figure 8.2
Removal
1. Hold the indicator with its front label upright.
2. Hold the Bezel with the fingers on the pullout grips provided on the left and right sides of the bezel. Pull the bezel outward.
The assembly comes out with the bezel.
User Manual
HumiTherm-i (Dry-Wet)
Section 8

12
Figure 8.2
‘UP’ inscribed on topside
UP
UP
Placing Back
Removal
Pullout Grip
Bezel
Front Label
PPI
HumiTherm-i
AL1 AL2
%RH
°C
HumiTherm
1
2
3
4
5
678910
11
12
13
14
15
16
17
18
Pt100
IN PU T 1
OUTPUT 2
+
RH SENSOR
SERIAL
COMMS.
+
SSR
RELAY
N/O
N/C
C
PPI
L
N
AC
DC
SUPPLY
-
Ex
IN PU T 2
_
GND
SSR
N/O
C
RELAY
N/C
+
_
OUTPUT 1
Placing Back
1. Hold the bezel with the front label upright.
2. Hold the enclosure such that the UP inscribed on the enclosure is on the topside. Insert the bezel gently with the boards on
either side sliding into the guides provided inside of the enclosure.
3. Ensure that the bezel fits in tight on the enclosure-front to secure the panel-sealing gasket.
The Figure 8.3 below shows the basic electronics assembly of the indicator (without any plug-in modules). The basic
electronics assembly of the indicator comprises of 3 Printed Circuit Boards. As shown in the figure, when viewed from the
front, the CPU board is to the right, Power-supply board is to the left and the Display board is behind the bezel.
Figure 8.3
PPI
Power Supply Board
CPU Board
Display Board
Bezel
VIEW
HumiTherm-i
User Manual
HumiTherm-i (Dry-Wet)

13
JUMPER SETTINGS FOR OUTPUT-1 (ALARM-1)
The Output-1 is user configurable for Relay or SSR voltage pulses. The selection requires proper jumper-settings prior to
electrical connections.
PPI
Pins
A
B
Link
1
2
3
1 2 3 4
HumiTherm-i
Figure 8.4
Table 8.1
Output Type Jumper Setting - A Jumper Setting - B
Relay
SSR Voltage
Pulses
1 2 3 4
1 2 3 4
1
2
3
1
2
3
The jumper settings are provided in the form of Pins & Link arrangement on the CPU board towards the rear end. Notice that,
there are two such arrangements; one of 4 -Pins marked A and the other of 3-Pins marked B in the Figure 8.4. Two Links are
provided, one each for A and B. Place the links to short two adjoining Pins as shown in Table 8.1 below for proper configuration.
User Manual
HumiTherm-i (Dry-Wet)

14
Figure 8.5
Table 8.2
Output Type Jumper Setting - A Jumper Setting - B
SSR Voltage
Pulses
Relay
(Arrangement
shown in
Figure 8.4)
As shown in above Figure, there are 2 jumper arrangements marked A and B. The selection between Relay and SSR requires
both these jumpers A and B to be set appropriately as shown in Table 8.2. The double headed arrows show the adjoining Pins
that require shorting using the Link.
The double-headed arrows, in Table 8.1, show the positions of the adjoining Pins that require shorting using the Link. The
wiring connections must also be made in accordance with the selected output type (NO, C) for Relay; Positive(+) & Negative(-)
for SSR.
MOUNTING PLUG-IN MODULES
The indicator supports Input-2 (DC Linear Voltage) module which is mandatary for measuring Relative Humidity (RH) Value
and 2 optional plug-in modules, viz. Output-2 (Relay/SSR) module and Serial Communication module. These modules are
either pre-fitted while the indicator is shipped from the factory or can be fitted by the user if ordered separately. Both the
optional modules have female connector (socket) mounted on them, which fit into the respective male connector (plug)
provided on Power-supply board
Output-2 Module (Alarm-2)
The Output-2 module provides, jumper selectable, Relay or SSR output. The Figure 8.5 below shows the output module and
the jumper arrangement.
The Figures 8.6 below illustrates how to mount the plug-in Output-2 module. Notice the orientation of the indicator and a few
identifying components shown in figure to help locate the plugs for the modules. Ensure that the socket snap-fits into the plug
and the 2 Projections of the module board fit into the 2 Slots provided on the Power-supply board for proper electrical contacts
and secured fitting.
User Manual
HumiTherm-i (Dry-Wet)
Jumper Setting-A
Jumper Setting-B

15
HumiTherm-i
Mounting Output-2 Module
Figure 8.6
For plugging out the module(s), follow the steps below:
1. Gently pull apart the Power-supply board and the CPU board until the projections of the module board come out of the slots.
2. Pull the module outward to unlock the socket from the plug.
Serial Communication Module
The plug for the Serial Communication module is located on the Power-supply board. The Figure 8.7 below illustrates how to
plug-in the Serial Communication module. To plug (or unplug) the module simply insert (or remove) the socket into (or from)
the plug.
Figure 8.7
Mounting Serial Communication Module
User Manual
HumiTherm-i (Dry-Wet)
P
PI
Plug & Socket
Connectors
Serial Communication
Module
Power Supply Board
Front Label
Upside-down
HumiTherm-i

16
Figure 9.1
PANEL MOUNTING
Follow the steps below for mounting the indicator on panel:
1. Prepare a square cutout to the size shown in Figure 9.1.
2. Remove the Panel Mounting Clamp from the indicator enclosure and insert the rear of the indicator housing through the
panel cutout from the front of the mounting panel.
3. Hold the indicator gently against the mounting panel such that it positions squarely against the panel wall, see Figure 9.2.
Apply pressure only on the bezel and not on the front label.
4. Slide the mounting clamp forward until it is firmly in contact with the rear face of the mounting panel and the tongues of the
clamp engage in the ratchets on the indicator enclosure, as shown in Figure 9.2. Ensure that the springs of the clamp push
firmly against the rear face of the mounting panel for secured mounting.
The Figure 9.1 shows the indicator front outer dimensions and the panel cutout requirements.
MECHANICAL INSTALLATION
Figure 9.2
UP
UP
PPI
OP1 OP2 HBA
Panel Mounting Clamp
Mounting Panel with
Square Cutout
indicator
Tongues
Springs
Ratchets
Bezel
Slide Forward
HumiTherm-i
HumiTherm
1
2
3
4
5
678910
11
12
13
14
15
16
17
18
Pt100
IN P UT 1
OUTPU T 2
+
RH SENSOR
SERIAL
COMMS.
+
SSR
RELAY
N/O
N/C
C
PPI
L
N
AC
DC
SU P PLY
-
Ex
IN P U T 2
_
GND
SSR
N/O
C
RELAY
N/C
+
_
OUTPUT 1
User Manual
HumiTherm-i (Dry-Wet)
Section 9
Panel Cutout
45 X 45 mm
-0, +0.5 mm
(1.77 X 1.77 in)
(-0, +0.02 in)
Front View
48mm
(1.89in)
48mm
(1.89in)
PPI
HumiTherm-i
AL1 AL2
°C
%RH

17
ELECTRICAL CONNECTIONS
WARNING
MISHANDLING / NEGLIGENCE CAN
RESULT IN PERSONAL DEATH OR
SERIOUS INJURY.
1. The user must rigidly observe the Local Electrical Regulations.
2. Do not make any connections to the unused terminals for making a tie-point for other wires (or for any other reasons) as
they may have some internal connections. Failing to observe this may result in permanent damage to the indicator.
3. Run power supply cables separated from the low-level signal cables (like RTD, DC Linear (Voltage) signals, etc.). If the
cables are run through conduits, use separate conduits for power supply cable and low-level signal cables.
4. Use appropriate fuses and switches, wherever necessary, for driving the high voltage loads to protect the indicator from
any possible damage due to high voltage surges of extended duration or short-circuits on loads.
5. Take care not to over-tighten the terminal screws while making connections.
6. Make sure that the indicator supply is switched-off while making/removing any connections or removing the indicator from
its enclosure.
CONNECTION DIAGRAM
The Electrical Connection Diagram is shown on the left side of the indicator enclosure. The diagram shows the terminals
viewed from the REAR SIDE with the indicator label upright. Refer the label provided on the Rear Side for terminal numbers.
The rear panel electrical wiring connection diagram is shown in Figure10.1 below.
Figure 10.1
HumiTherm
1
2
3
4
5
67 8 910
11
12
13
14
15
16
17
18
Pt100
INP UT 1
OUTPUT 2
+
RH SENSOR
85~264
VAC
+
SSR
RELAY
NO NC C
PPI
L
N
SUPPLY
-
Ex
INP UT 2
_
GND
SSR
NO
C
RELAY
NC
+
_
OUTPUT 1
RS 485
SERIAL
COMM.
User Manual
HumiTherm-i (Dry-Wet)
Section 10

18
DESCRIPTIONS
INPUT-1 : RTD Pt100, 3-Wire (Terminals 1, 2 and 3)
The indicator accepts 3-wire RTD Pt100 as input for measuring Dry Bulb Temperature Value.
Connect single leaded end of RTD bulb to terminal 1 and the double leaded ends to terminal 2 and 3
(interchangeable) as shown in Figure 10.2 (a). Use copper conductor leads of very low resistance
for RTD connections. Ensure that all 3 leads are of the same gauge and length. Use single run
cables avoiding any intermediate joints.
Figure 10.2 (a)
3
2
1
OUTPUT-1 (ALARM-1) & OUTPUT-2 (ALARM-2)
The Output-1 and Output-2 (if fitted) can be configured as either Relay or SSR Drive Output. The configuration is through
hardware jumper settings as described in Section 8: Hardware Assembly & Configurations. The terminals for Relay or SSR
Drive are as shown in Figure 10.3 (a) & 10.3 (b), respectively. The numbers in brackets indicates the terminal numbers for
Output-2 and those outside brackets indicates the terminal numbers for Output-1.
Drive for SSR
DC Voltage level is generated for switching the external SSR (Solid State Relay) which in turn
switches the load. Connect (+) and (-) terminals of SSR to indicator terminals 6 and 4, respectively.
Use Zero-Crossover, 3 to 30 VDC operated SSR.
Relay
Potential-free Relay changeover contacts N/O (Normally Open) and C (Common) rated 2A/240
VAC (resistive load) are provided as Relay output. Use external auxiliary device like contactor with
appropriate contact rating for driving the actual load.
6 (9)
5 (8)
4 (7)
Figure 10.3 (b)
INPUT-2 : DC Linear Voltage (Terminals 16,17 & 18)
Connect Signal (OUT), Common (GND) and Supply (V+) cables from RH Sensor to terminals 16,
17 & 18, respectively as shown in Figure 10.2 (b). Terminal 18 provides +5Vdc @ 20mA excitation
supply for the Sensor. Use copper conductor leads of very low resistance for connections. Use
single run cables avoiding any intermediate joints.
Figure 10.2 (b)
18
17
16
Ex
RH Sensor
GNDOUT V+
6 (9)
5 (8)
4 (7)
N/O
C
Figure 10.3 (a)
N/C
POWER SUPPLY Figure 10.4
The indicator is supplied with power connections suited for 85 to 264 VAC line supply. Use well-insulated copper conductor
2
wire of the size not smaller than 0.5mm for power supply connections. Connect Line (Phase) supply line to terminal 12 and the
Neutral (Return) supply line to terminal 13 as shown in Figure 10.4 above. The indicators is not provided with fuse and power
switch. If necessary, mount them separately. Use a time lag fuse rated 1A @ 240 VAC.
User Manual
HumiTherm-i (Dry-Wet)
Line
Neutral
12 (L)
13 (N)
2 Pole
Isolating Switch
Fuse
Power Supply
Terminal