ESD ESD 90 Series User manual

Digital Temperature Indicator
ESD 90 series
The Inside Stuff
1. As you unpack
2. Introduction
3. Operation
4. Features
5. Specifications
6. Block Diagram
7. Schematic
8. Installation
9. Calibration
10. Look-up Table
11. Fault Diagnosis
12. Certificate
13. Ordering
14. Health Tips
15. Definitions
st
Version - 11 Date - 1 June 07

1. As you unpack
Congratulations on buying
ESD - 90 series
Digital Temperature Indicator
As you unpack kindly ensure that
1. The material received is in good condition
2.You have received following material
i) ESD - 90 series Digital Temperature Indicator as
per your purchase order.
ii) Mounting bracket pair.
iii) This manual along with Warranty Certificate.
iv) Test Certificate.
In case of any discrepancies contact our customer support
department immediately.
We are sure you will get long and troublefree service
from our instrument.
Every attempt is made to make this Manual clear and easy to
understand. We believe that you will feel confident to install, use
and maintain our product. ESD welcomes your suggestions,
which will help us improve this product as well as the document
and make them more user friendly.
+We need your feedback :

Temperature Indicators play an important part in the
process industry. Quick and accurate measurement of the
process temperature will improve the final product quality,
reliability and reduce rejection. Temperature indication is
thus one of the prime considerations in the process
industry.
The ESD 90 series is a Digital Temperature Indicator
designed for fast and accurate measurement. It is designed
using highly reliable electronic components. Process
temperature is displayed directly in digits, giving better
resolution compared to analog indicators.
The ESD 90 series accepts all types of Thermocouples,
Pt - 100, 0 to 20 mA, 4 - 20 mAas well as 0-2/5/10 V DC as
input. Wide ranges of measurement are available
depending on the sensor used.
The ESD 90 series has various models with different
display heights to suit various applications where long
distance visibility is a must. This series has models with
display heights varying from standard 12.5 mm to
25,50,100,150,200,250,300 mm.
The instrument is immune to mechanical vibrations. Even
the mounting position will not affect the measurement
accuracy. The bright Red LED seven segment display
allows long distance readability. Use of highly reliable
electronic components with low temperature coefficient
ensures long and trouble free service. The instrument is
tested for its performance under various climatic
conditions.
2. Introduction

3. Principle of Operation
The ESD 90 series is based on the principle of a high input impedance
amplifier feeding an analog to digital convertor. The input signal
generated by the transducer is fed to a sensor compensation circuit,
where automatic ambient compensation in case of thermocouple and
lead resistance compensation in case of Pt-100 is achieved.
Duly compensated signal is fed to a signal conditioning amplifier,
output of which is given to digital display.
Linearisation of the input signal from the transducer is done by
hardware in the input circuit. This gives a standardized signal to the
analog to digital convertor which drives the LED display, indicating
the temperature directly.
4. Features
Proven field performance
Highly compact
Dust and vermin proof enclosure with epoxy powder coating
LED display gives better long distance readability
Fast response
Available in different DIN standard cutouts
Designed for Thermocouples, RTD, mA, mV input
Maximum MTBF and minimum MTTR
Choice of different display heights to suit various applications

5. Specifications
Model : ESD 9010 / ESD 9012 / ESD 9013 / ESD 9014
Ranges :Refer chart in Ordering Information
Input : Thermocouples / Pt - 100 (3 wire sys) / 4 - 20 mA
No. of Inputs : One
Indication accuracy : +/- 0.5 % of FS +/- 1 digit
ooo o
Least count : 0.1 C upto 200 C, 1 C above 200 C
Accuracy deviation
oo
a) Temp. change : +/- 0.01 % / C, reference at 25 C
b) Supply Variation : +/- 0.005 % /V
Display : 3 & 1/2 digit 7 segment 12.5 mm Red LED
Power supply : 230 VAC, +/- 10 % , 50 Hz
o
Ambient Temp. range: 5 to 55 C
o
Amb. Temp. : Built in upto 55 C only for thermocouple input
Compensation
Sensor break indication: Up scale [i___] (Down scale on demand )
Relative Humidity : 90 % Non-condensing
Power consumption : 6 VA
Input impedance : > 10 Mohms , (only for thermocouple input )
Weight : 600 grams approximately
Mounting : Flush Panel
2
Termination : PUT 2.5 mm
Dimensions (mm) :
ESD 9012
72 x 72
Model Facia
ESD 9010 96 x 48
Depth
80
100
67 x 67
Cutout
92 x 45
ESD 9013
ESD 9014
96 x 96
144 x 72
50
100
92 x 92
138 x 67
Add 25 for terminals

6. Block Diagram and Operation6. Block Diagram and Operation
1. Temperature sensor: This block consists of either a Thermocouple,
Pt- 100 (RTD) or a 4 - 20 mAcurrent signal. It senses the temperature
and sends a signal to the sensor compensation circuit.
2. Sensor compensation: consists of a bridge generating mV signal
corresponding to the ambient temperature. In case of thermocouple
input this is added to input mV signal for automatic ambient
temperature compensation. In case of Pt-100 input, it gives constant
current for Pt-100 excitation and provides 3 wire system for lead wire
compensation.
3. Signal conditioning circuit: reads the signal from the sensor and
calculates the temperature. It consists of a bridge and an amplifier.
The signal from the sensor causes an unbalance in the bridge. This
unbalance is proportional to the temperature being measured. The
output of the bridge is amplified and calibrated suitably to display the
temperature. The amplifier output is fed to the display circuit and the
comparator.
4. ADC & Display : consists of an analog to digital convertor (ADC), a
digital voltmeter and 4 seven segment LED displays. The ADC
converts the analog output of the amplifier to a digital signal which is
read by the digital voltmeter and displayed on the seven segment
displays, directly in terms of process parameter.
.
.
1. Temperature sensor: This block consists of either a Thermocouple,
. Pt- 100 (RTD) or a 4 - 20 mAcurrent signal. It senses the temperature
. and sends a signal to the sensor compensation circuit.
2. Sensor compensation: consists of a bridge generating mV signal
corresponding to the ambient temperature. In case of thermocouple
input this is added to input mV signal for automatic ambient
temperature compensation. In case of Pt-100 input, it gives constant
current for Pt-100 excitation and provides 3 wire system for lead wire
compensation.
3. Signal conditioning circuit: reads the signal from the sensor and
calculates the temperature. It consists of a bridge and an amplifier.
The signal from the sensor causes an unbalance in the bridge. This
unbalance is proportional to the temperature being measured. The
output of the bridge is amplified and calibrated suitably to display the
temperature. The amplifier output is fed to the display circuit and the
comparator.
4. ADC & Display : consists of an analog to digital convertor (ADC), a
digital voltmeter and 4 seven segment LED displays. The ADC
converts the analog output of the amplifier to a digital signal which is
read by the digital voltmeter and displayed on the seven segment
displays, directly in terms of process parameter.
TransducerTransducer SignalSignal
ConditionerConditioner AmplifierAmplifier ADC &ADC &
DisplayDisplay
FieldField

7 Schematic and Connection Diagram for
ESD 9010, ESD 9012, ESD 9013 & ESD 9014
SPAN :- ‘Span’ adjust Potentiometer ZERO :- ‘Zero’ adjust Potentiometer
DISPLAY :- 12.5 mm 7 segment Red LED IC1 :- Amplifier
E N P
123456
SUPPLY
VOLTAGE
Pt-100 (3 WIRE RTD)
TC - THERMOCOUPLE
Pt 100
+TC
Connection Diagram
Mother board
PCB ESD-9010MB5
PCB ESD-9012MB
Rear PCB
ESD-9010BK-R2
ESD-9012BK
ESD-9014BK
211
E N P R G B
Display Module
PCB ESD-9010DPM
PCB ESD-9012DPM
PCB ESD-DPMSML-R4
ZERO
SPAN
U1
CN1
CN2
7805
Transformer
ESD 172
SENSOR
PRIMARY
4 pin connector
7805
Transformer
ESD 172
ZERO
SPAN
IC1
CN1
ESD-9013MB-R2
213
Rear PCB
ESD-9013BK-R1
E N P R G B
SENSOR
PRIMARY
Ambient Temp.
compensation
for T/C type
Ambient Temp.
compensation
for T/C type
ESD 9013 ESD 9010, ESD 9012 & ESD 9014
U1
U1

8. Installation Procedure
$Also observe Instrumentation Health Tips chapter 14
The instrument should be mounted in a place where it is clearly visible
and accessible.
1. Insert the instrument in a suitable cutout and fix it using the bracket
pair provided on the sides.
2. Depending on the type of instrument make connections as shown in
Connection diagram ( Chapter 7 ).
3. In case of Pt-100 sensor Red wire is to connected to the terminal
indicated with a Box.
4. In case of thermocouple input terminal no. 5 has no connection.
5. Use correct compensating cables for thermocouple type instruments.
6. Ensure proper earthing to the instrument.
7. Connect a series combination of 0.1 F /600 V non polar capacitor &
220 ohms 1/2 W resistor across phase & neutral.
75 mm

9. Calibration Procedure
Warning: Procedure to be carried out strictly by technical persons.
MFollow instructions given in this manual.
The instrument is calibrated at the factory using accurate calibrating
equipment traceable to international standards. No recalibration should
be required in normal course, however if the instrument requires
recalibration, follow the procedure given below:
i. Remove the cover of the instrument, by removing the fixing
screws on the back side of the instrument.
ii. Switch on the supply and allow 5 min. to achieve thermal stability.
iii. For uniform error distribution calibration points should be at 20%
of Full Scale (FS) for ZERO calibration and at 80% of FS for SPAN
o
calibration. i.e. If the range is 0 to 1000 C, the ZERO calibration
o
should be done at 200 C (20% of FS) and SPAN calibration should be
o
done at 800 C (80% of FS).Depending on the type of input proceed as
follows :
9.1) Thermocouple input
1. Remove the thermocouple from its terminals and connect a stable
mV source in its place with proper polarity.
2. Feed ambient compensated mV corresponding to 20 % of FS.
The display should show corresponding temperature. If the
displayed temperature is incorrect turn the potentiometer marked
'ZERO' to display correct reading (CW to increase & CCW to
decrease).
o
eg.: Cr-Al thermocouple - Ambient compensated mV for 200 C
oo
at ambient temp 30 C will be mV corresponding to 200 C
o
(8.137mV) minus mV corresp to 30 C (1.203 mV) = 6.934 mV

3. Feed ambient compensated mV corresponding to 80 % of FS.
The display should show corresponding temperature. If the
displayed temperature is incorrect turn the potentiometer marked
'SPAN' to display correct reading (CW to increase & CCW to
decrease).
o
eg.: Cr - Al thermocouple - Ambient compensated mV for 800 C
oo
at ambient temp 30 C will be mV corresp. to 800 C (33.277 mV)
o
minus mV corresponding to 30 C (1.203 mV) = 32.074 mV
Repeat steps 2 and 3 to get zero error at both calibration points.
9.2) Pt - 100 input ( 3 wire system)
1. Remove the Pt - 100 from its terminals and connect a resistance
decade box with 3 wire system in its place.
2. Feed resistance corresponding to 20 % value of FS (eg.resistance
oo
corresponding to 20 C for 0 to 100 C range) The display should
show corresponding temperature. If the displayed temperature is
incorrect turn the potentiometer marked 'ZERO' to display correct
reading. (CW to increase and CCWto decrease)
3. Feed resistance corresponding to 80 % value of FS (eg. resistance
oo
corresponding to 80 C for 0 - 100 C range). The display should
show corresponding temperature. If the displayed temperature is
incorrect adjust the potentiometer marked 'SPAN' to display
correct reading. (CW to increase and CCWto decrease).
Repeat steps 2 and 3 to get zero error at both calibration points.
Check the calibration of the instruments every six months.
In case of error recalibrate using certified calibrators only.
6