,.
W
6 ChannelScanning
DigitalThermometer
ANALOG
DEVICES
AD2036 I
I
FEATURES
AutomaticlManual Scan of 6 Thermocouples (TCs)
External Channel Selection by BCD Code
J, K, or T Thermocouple
°c or of Readout
Self-Contained Linearization
Isolated Analog Input
Parallel BCD Output
1° Resolution, 0.1° Optional
AC Line or de Powered
+5V de at 10mA for External Logic
OBS
APPLICATIONS
Multi-Point Temperature Measurements for Remote
Data Acquisition and Data Logging
Temperature Monitoring in Design, Laboratory, Manufacturing and Quality Control
OLE
GENERAL DESCRIPTION
The AD2036 is a low cost 3~ digit, ac line or dc powered digital
readout temperatUre meter. Inputs for six thermocouples of
identical 7pes, either J, K, or T and calibrated temperatUre
ranges in C or of, make up a total of six available models.
Cycling on an internal clock, the AD2036 can continually
scan 6 input channels. Individual channels can be manually
selected via a small switch on the front. Channel selection
can also be made via an external BCD input at the rear
connector. A separate channel select output identifies the
selected channel independent of selection mode. The channel
select output together with the BCD Output provides complete information for automatic data collection. The Isolated
Parallel BCD Output provides an easy interface to conventional recording and controlling instruments. For applications
where there are high common mode voltages (CMV) present,
the AD2036 has as a standard featUre a floating opto isolated analog front end that will withstand CMV's up to
2S0V rms.
The AD2036 displays readings on large 0.5" (13mm) high
LED displays. Both (+) and (-) polarities are indicated. Controls are provided for blanking the display.
AUTO/SCAN
The AD2036, while in the Auto/Scan mode, will permit unattended scanning of all six input channels. The rate of the
channel select is 3.2 seconds, 1.6 seconds or 0.8 seconds.
The AD2036 can be used as a stand-alone instrument and with
For detailed information,
the Scan input held high will continually scan six channels.
When the Scan input is brought low the AD2036 will continue
to cycle and stop at channel O.When used with a printer the
channel select number in addition to the converted BCD value
can be recorded.
TE
MANUAL CHANNEL SELECTION
A switch on the front enables the user to manually select an
individual thermocouple. As in the Auto/Scan mode, the
BCD Output of the selected channel and the channel number
are available. Selection of an individual TC channel automatically disables Scan and external channel selection is overridden. The Mode Output pin indicates when the switch is in
this condition~ On special order, meters can be supplied with
card edge control for disabling the switch.
EXTERNAL CHANNEL SELECTION
For remote control of channel selection the AD2036 provides an input for an external BCD code selection. This
featUre enables external BCD switch, automatic microprocessor or computer control.
STANDARD PACKAGING
The AD2036 is packaged in Analog Devices' ac line powered
DPM case which uses the same panel cutout as most other ac
line powered DPM's from other manufacturers. In addition,
the pin connections for the AD2036 converter board are the
same as for the AD2022, AD2009, AD2016 and DPM's available from several other manufactUrers.
contact factory.
DIGITALPANEL INSTRUMENTS VOL. /I, 7~35
III
SPECIFICATIONS
(typical. +25°Candnominallinevoltageunl..
-
Channel BCDOucputs (CMOSfITL Colllpatibk 2 TIL Loads) BCD
Channel number data outputs are:positive trUe.
TYPES OF THERMOCOUPLE lTC&), J. K, or T
ACCURACY'
°c
J
K
T
DISPLAY
.
of
Error
tLSB
t1.4
-60toO
t1.4
0 to 500
500 to 760
t2.2
-60 to 0
0 to ISO
150 to 1350
-100 to 0
0 to 250
250 to 400
J
Mode OutPut (CMOSfITL Compatible 2 TIL Loads) . Logic "I" indicates
channel selection is by switch. Logic "0" indicates selecrion is by scanner
or external control, uteful in microcomputer interface.
Error
tLSB
t2.5
-76 to 32
t2.5
32 to 932
932 to 1400 t4.0
t1.4
t1.4
t2.6
K
-76 to 32
32 to 302
302 to 2000
t2.5
t2.5
t4.7
t1.3
t1.5
t2.0
T
-148 to 32
32 to 450
450 to 752
:t2.3
t2.7
t3.6
DataReady(DataReady)lCMOSfITLComoatible2 TIL Loads)- Logic
"I" ("0") indicates data from Temperature Card is ready. Data remains
valid until next eloCkpulse (198ms).
Soare:Inverter OutPut (CMOSfITL Comoatible 2 TIL Loads) . Spare in.
verter supplied for customer convenience.
-
Clock OUT (CMOS.TIL Compatible 2 TIL Loads) Indicates E.O.C.
When Clock pulse is high latches are being updated, data is invalid. Data
is valid on neprive going edF. Clock OUT pull<: is disabled when DATA
HOLD line is low.
Anal",
SIGNAL INPUT
. Input Impedance. looMO
. Bias Current. IOnA
. Overvoltage Protection BetWCCnChannels, tl8V peak max
Common Mode Voltage. t350V peak max
. CMV Between Channels, t6V peak max
. TemperatUre Coefficient' Span, +temp, lOOppm;-temp, 120ppm
Zero. 0.03degrees/degrec C or F
.
. Settling Time to Rated Accuracy. 2.0 seconds (full span step input)
. Normal Mode Rejection. 6OdB at 50 - 400Hz
. Common Mode Rejection, 12OdB@ 2S0V rms max CMV (BetWeen
TC's and digital gnd), dvan/dt<1O6V/sec, 2500 imbalance
OBS
TEMPERATURE
.
.
POWER
CONTROL INPUTS
Compatible
3 LSTTL Load)
- Logic
"0"
or
grounding blanks entire display except for decimal pointS; Logic "I"
or open circuit for normal operation. Display blanking has no effcct
on output data. Display is valid immediately upon removal of blanking input.
Converter Hold (CMOS TTL Compatible. I LSTTL Load) - Logic "0"
or grounding causes DPM to cease conversions and display data from
last conversion; Logic "I" or open circuit for nonnal operation. After
"Convener Hold" is removed, one or two conversions arc needed before
reading and BCD are valid.
Decimal Points (Not TIL Compatible) . Logic "0" or grounding illuminates desired decimal point. External drive circuitry must sink 35mA
peak at a 25% duty cycle. when decimal point is illuminated.
-
Dai'aHOid (TTL Compatiblc I TTL Loacj) Logic "0" or grounding
inhibits updating of latch cd paralld output data of AD2036. Logic "I"
or open circuit allows data to be updated after each DPM conversion.
This input has no effecI on the normal conversion of the DPM and itS
display.
Scanner Enable (CMOS/TTL Compatible I LSTTL Load). Logic "I" will
enable Scanner to control the channel selection. External channd input
BCD lines can remain connected. A Logic "0" enables external channel
selection.
Scan (ScaIll.LCMOS/TTLComoallllie. 1 L~rTL Luad) . A I.~ic "I" ("0")
tOI <4 seconds wllllnlllalC a scan uf SIXchannels. Tu us<: Scan input, th..
Scan InpUt must be . logic "0". Both inputs have debouncc circuitry. A
momentary scan pulse while in the switch or external selection mode will
initiate a sequencc of SIXreadings of the channel that IS addressed
then Stop.
Channel BCD Input (CMOSfITL Compatible I LSTTL Load) - Logic "0"
on Scanner Enable will allow use of external
inputs remain the same.
Channcllncrement
(CMOSfITL
going edge will ,nitiate sequence
control.
Compatible
All other control
I LSTTL Load)
. Positive
to the next channel.
~nverter
Input (CMOS TTL Compatible
inverter supplied for Customer convenience.
I LSTTL
RANGE2
0 t~ +500C ?ferating
-25 C to +85 C Storage
OUTPUT
. AC line 50 - 400Hz, See Voltage Options below
. Power Consumption - 5.8W @ 50 - 400llz
. 12V dc +20%- 10%, 4.8W
. 5Vdct S%,4W
.. Zero
Span
CALIBRATION ADJUSTMENTS
OLE
.
CONVERSION RATE
. 5 conversions per second
Hold and read on command
Blankil1l (TIL
- Nonlinear Error to.5'" tlmV
VOUT, °c : (1. 784mV tC) Temperaturc
VOUT, of: (0.99ImVtF)(T-32)
. +5V dc@ 10mA
POWER INPUT
.
Display
Output
OUTPUT
Lipt emittinc diode (LED). seven segment display readoutS, 0.5"
(Umm) hip for 3 data diaits. 100!!. oYCtranF and polarity indic".
tion. Overload> 1999 indicated by flashing display, polarity remains
valid. Tbere is no overload indication for out of range readings.
Decimal points (3) selectable at input connector.
Display Blanking
.
.
otherwi. specified)
Load) . Spare
. Recommended Recalibration Interval, six months
SIZE
. 3.92" x 1.67"H x 5.80"D (100 x 42 x 147mm)
. Panel cutout 3.930" x 1.682" (99.8 x 42.7mm)
WEIGHT
. 1.25 pounds (0.568 kg)
TE
DISPLAY LENS.
Lens 22-1, Red, °Cwith ADI Logo
Lens 22-2. Red, of with AD! Logo
Lens 23.1, Red, °c without ADI Logo
Lens 23-2. Red, of without ADI logo
CONNECTORS(2)
2 each,.30 pin, 0.156" spacing card edge connebor
Viking 2VK15D/I-2 or equivalent.
Optional, Order ACI501.
ORDERING
THERMOCOUPLE
-
Isolated Parallel BCD OumutS 3 BCDdigits, Overrange, Overload and
Data Ready OutpUtS (TTL Compatible. 4 TTL Loads). BCD data OUt.
puts arc latched positive true logic. Overrange Output is logic "I" fot
data display greater than 999. Overload Output is Logic "0" for inputS
great~r than full scale range, Logic "I" when other data outputS are
valid. Polarity Output (TTL Compatible, 4 TTL Loads latched) ind~
cates positive pol amy when high (Logic "I"). Digital outputs arc fully
Isolated from Input circuitry; all logic levels are referenced to digital
ground.
VOL. 1/, 16-36 DIGITAL PANEL INSTRUMENTS
TYPE>
-
ENTER
~ f
POWER INPUT>
117V ac tlO%
220V ac tl0%
looV ac tlO%
240V ac tlO%
5V de tS'"
12V de +20%,-10%
SCAN RATE>
3.2scc:
1.6see
0.8sec
H
!
I
0
J
- ENTER#
- ENTER#
- ENTER#
NOTES
, For 0.1' '_lotion
accuracy remain, the aamc. R..".
200.0'
. Guaranteed
'Only on. option may be opecificd.
Spcc
-
1\
RESOLUTION>
1.0°
0.1°
.
0
- ENTER#
DEGREE READOUT>
°c
of
Lena 22 is ..pplicd
DATA OUTPUTS
GUIDE
AD2036
II no lena option
is ope<iftcd.
riona lubject to ch...p without nOtice.
is limited to
0
0
0
ApplyingtheAD203.6
.
UNLINEARIZED ANALOG OUTPUT
~{
-------ANALOG
=~
LOGIC
E
~E1
'
CHANNEL
A~IMARY
BCD .
INPUT,
CHANNEL INCREMENT
SCAN
{
OBS
~
DIGITAL
SCANNER
DATA'ReADY
DA.TA REA
--
E)<TERNALCONNECTION
CLOCK
IN
CLOCK
The converter drives the Display and the Parallel BCD Output circuitry.
TE
BCD Channel Selection is obtained from the Switch or the
output of the Tn-State Multiplexer. In standard units, switch
selection of individual TC Channels always takes precedence
over the Tn-State Multiplexer. On special order, units can
be wired for card edge enable/disable of the Switch. Under
control of the Scanner Enable input, the Tn-State Multiplexer switches between channel selection from the Digital
Scanner and the external Channel BCD Input. A logic low
enables external selection. A logic high enables input from
the Scanner.
APPLYING THE AD2036
~Kriprlonof~rlon
The AD2036 Block Diagram is shown in Figure 1. Thermocouple selection is made by the CMOS Multiplexer which is
comprised of tWo sets of six switches. The output of the
Multiplexer is on two lines. One is connected to Analog
Ground. The other is fed into an Amplifier that provides for
Cold-Junction Compensation. The signal is then filtered and
linearized and processed by the Analog to Digital Converter.
.--l1.
WIDE
As shown in the Timing Diagram of Figure 2, a Channel Scan
is initiated by a logic high on the Scan input (pin S). The
conclusion of the previous scan cycle will have resulted in
Channel "0" already being selected. Conversions take place
S times per second but 3.2 seconds are allowed to elapse..
before the Data Ready output indicates the data is valid.
A minimum of 2 seconds is required for worst case settling
a
I I
I
I
a
!-'8PULSES ..-I I a PULSES PULSES PULSES
I""
"'&1"'..
CLOCKOUTjlllllllllllllllllll"III~:I::II~I~II~:~IIII~I~I.I~IIIII
-
DATA READY
OUT
Figure 1. Block Diagram
DESIGNED AND BUILT FOR RELIABILITY
Even beyond the inherent advantag~s of the LSI IC design
and LED displays, the AD2036 has had extreme care taken
in its design and manufacture to insure reliability. Manufacturing processes are monitored by continual quality
assurance inspections to insure proper workmanship and
testing. Automatic equipment is used to test each DPM, both
at the board level and at final assembly, to assure fault free
performance. And, prior to shipment, each AD2036 must
pass one full week of failure-free +SOOCcycled power
burn-in.
SCAN
--
OLE
INVERTER
SPARE~
!-3.2SECONDS'--\
I..3.2 SECONDS'.1
..
u--1
?
I
,l
aPULSES
I'.PULSES,
-10"
4
.
DATA HOLD
CHANNEL
INCREMENT
+
"0"
BCD CHAN. NO,
"'"--t-
"2"
-t-"3" -t--
--t--.'S..-+-"0"
DATA VALID
'SHORTER
SPECIAL
INTERVALS
REQUEST,
AVAILABLE
ON
Figure 2. SCAN Timing Diagram
TRANSDUCERS AND REFERENCES 261
. a full span step change as could take place in switch.nnel selection. On special order, where conditions do
nant the 3.2 second delay, units can be provided with
teady occurring after 1.6 seconds or 0.8 seconds. Data
tually be taken up to the maximum 5 per second con,1 rate (contact factory for further information).
, standard unit, the Data Ready line switches high 16
pulses after Scan initiation (approximately 3.2 seconds).
)ata Hold input can then be switched low if it is deto retain the data unchanged for more than the miniI
interval of 200ms. Upon releasingthe Hold, it is neces-
to produce a positive going pulse change on the Channel
:ment input in order to step the Channel Selection. In
y cases the Data Hold and Channel Increment inputs can
ied together so that release of the Hold will automatiy step the Channel Selection.
:his fashion (and as shown in Figure 2) a complete cycle
:he six channels can be obtained with the AD2036 stopping
Channel "0" and awaiting another Scan input pulse to
nal the start of another cycle.
OBS
teration with Printer
put and output connections for operating with a printer
e shown in Figure 3. A scan of the channels is initiated via
Ish button or other pulse source. When Data Ready goes
Igh, Busy from the printer goes low. This "holds" the Data
rld Channel Number Outputs until the printer raises the
,usy. When Busy goes high the "hold" is released and the
hannel counter is incremented. After 3.2 seconds (in the
tandard unit), the Data Ready again goes high and the interocking of signals repeat 5 times until data has been printed
for all six channels. Each automatic or manual initiation of
the scan causes the sequence to repeat.
Stand-Alone Operation
The AD2036 can at any time under switch control be operated so as to allow examination of individual channels. When
used as a stand-alone instrument, it may also be desirable to
be able to initiate a single scan of all six inputs. Figure 4
shows the necessary interconnections to obtain this operation. As before, the cycle is initiated via a pulse from a push
button or other source. In this case, however, the Data Hold
and Channel Increment inputs are controlled by the Data
Ready. Each time Data Ready goes from low to high, the
channel is incremented and conversions are made on the
newly selected channel. The process continues until the
meter is back on channel "0". The meter then waits for
another scan initiation. During a scan each channel is displayed for 3.2 seconds (the whole scan takes approximately
20 seconds). Simultaneous display of channel number and
converted value requires implementation of a separate display
for channel number.
TCINPUTS
OLE
To continuously scan all six channels with a printer, set up
as in Figure 3 except Scan must be held at Logic "0". .
TCINPUTS
AD2036
OUT
CLOCK IN
DATA HOLD
CHANNEL
INCREMENT
-0
I-
PUSH
TE
,£.
TOSCAN
EXTERNAL
CHANNEL
SELECT
CIRCUITRY
Figure 4. Stand-Alone Operation
To continuously scan, set up as per Figure 4 except fIX the
Scan input at Logic "0".
-~
o()~~
~
SCAN
Figure3. AD2036 with Printer
For continuous printing of a single channel set up as in Figure 3 except fIX Scan at Logic "0". Channel can be selected by
switch or externally.
For external Channel Selection, the Scanner Enable line should
be held low. Under external BCD control, Channel Selection
occurs immediately. If the Scan line is pulsed to a logic low,
the printer will print the selected channel data 6 times and
stop. If held low, a continuous printout of the selected channel will result. +SV power is provided at the rear connector
to power external control logic.
~?
CLOCK
TR4NSDUCERS AND REFERENCES
Opto Isolation
The AD2036 has as a standard feature ~pto Isolation. This
prevents external digital load currents from entering the
analog circuitry via common ground paths and also enables
safe temperature monitoring of equipment where there is
no isolation from ac. As shown in the block diagram, Figure I,
digital and analog circuitry as well as the ac are isolated.
wOoingConnections
Power connections, thermocouple connections and control
and digital connections are accessible at the rear. All but the
thermocouple connections are via card edge (see Figures 6 and
7). Thermocouple wires are connected to a barrier strip on the
top board (see Figure 5).
To install thermocouple wires, remove shroud from rear of
unit by removing the screw. Feed thermocouple wires
through slots in the shroud (see Figure 9). Thermocouple "inp'
wires are attached directly to the barrier strip. For easy acces:
turn AD2036 upside down. (+) and (-) polarities are designate
on the P.C.B. Care must be taken when connecting input wir,
to insure correct polarity. Figure 5 shows proper polarity arv
channel designations. Replace shroud after connecting TC's.
Calibration Procedure
A precision voltage source and pure water Ice Bath are required. Location of the calibration adjusts are shown in
Figure 8,
TC
WIRE
B:
BARRIER
STRIP
+ I CALIBRATED
DC
MILLIVOLT
SOURCE
PIN A
ICE BATH
BOTTOM VIEW
P2
Figure 5. Thermocouple Connections
OBS
Figure 8. Calibration Diagram
Power connections, control inputs and digital connections
are contained in the pin out diagrams in Figures 6 and 7.
PIN REF PIN FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PIN REF PIN FUNCTION
DATA HOLD
IN
CLOCK OUT
POLARITY
BCD 8
K,EY
BCD 2
BCD SO
BCD20
BCD 800
ANALOG GROUND
BCD 400
BCD 200
DISPLAY BLANK
OVERRANGE
AC LINE HIGH
A
B
C
0
E
F
H
J
K
L
M
N
P
R
S
With the voltage source set to zero, adjust the Zero control
(top left) for a reading of 000 for Celsius or 032 for
Fahrenheit units.
OLE
L
BCD 1
BCD 4
BCD 10
BCD4D
BCD 100
DP3 XX.X
DP2 X.XX
DIGITAL GROUND
DP1 .XXX
SHIELD EARTH GROUND}
AC LINE LOW
Using Table 1 for the proper thermocouple, set the calibrate.
voltage source to the appropriate number of millivolts and
set span adjust (outer bottom right) for a correct reading.
TE
Figure '6. Converter Card
Pin Designations, P 1
I PIN REF PIN FUNCTION
I
1
2
K Y 3
4
5
6
7
8
9
10
11
12
13
14
15
ANALOG GND
DATA READY
SPARE INVERTER OUTPUT
RESERVED FOR FUTURE FUNCTION
FA
MODE OUTPUT
CHANNEL INPUT BCD 1
NC
NC
NC
NC
CLOCK IN
CHANNEL OUTPUT BCD 4
DIGITAL GND
FACTORY USE
PIN REF PIN FUNCTION
A
ANALOG OUTPUT
B
DATA READY
KE
C
CHANNEL INCREMENT
0
CHANNEL OUTPUT BCD 1
E
FACTORY USE
F
SPARE INVERTER INPUT
H
CiiANNEL INPUT BCD 2
J
RESERVED FOR FUTURE FUNCTION
K
I""ANNE' OUTPUT AN> 2
SCAN
ENABLE
L
M
RESERVED FOR FUTURE FUNCTION
N
CHANNEL INPUT BCD 4
r!!l!DT
P
R
+5V de (REF. TO DIG. GRD)
S
SCAN
I
Figure 7. Temperature Card
Pin Designations, P2
n-d' _n
-u-
- -- ---d' -n
TC
Sensor Type
Color Code
Polarity
Input
Reading
Input/mV
Reading
J
Iron
Constantan
White
Red
+
O.Omv
O.Omv
OoC
noF
41.013
41.013
730°C
1346°F
K
Chromel
Alumel
Yellow
Red
-
O.OmV
O.OmV
OoC
32°F
52.049
42.03
1290oC
1880oF
T
Copper
Constantan
Blue
Red
-
O.OmV
OOC
-
+
+
O.Omv 3ZoF
Table 1. Calibration
19.516
373°C
19.536
713°F
Chart
TRANSDUCERS AND REFERENCES 263
----
4.18
KEY BETWEEN
PINS2&3
CONNECTOR P2
1106.01
1
0.045 MAX
11.141
SLOTS FOR
THERMOCOUPLE
WIRES
@
@
0000000
A02038
POWER
SUPPlY INPUT
- 0 '" VAC50.S0'" '0
100VAG50.60'"
@@
E 0 220 VAG 50.60 '"
H 0 260 VA< 50-60 '"
THERMOCOUPLE SELECTION
J 0 .60 w 700"C .,. w 1400°'
K 0 .SO '" '350°C
.,. w 2000°'
T 0100
0" 400°C,,",
w
T"o,
OEOREE READOUT
, 0 DEGREE CENTIGRADE
2 0 DEGREE 'AHRENHEfT
3.92
199.61
KEY BETWEEN
PINS5&6
CONNECTOR P1
REAR VIEW
0 DENOTES OPTOON
00000
00000
0000
ZERO ADJUST
b
IFACTORY USE)
"ANALOG
WOEVICES
MADE IN U.SA
It
VENTI LA TlON
HOLES
OBS
FRONT VIEW
15
(FACTORYUSEI
Lr
0.93
123.61
t'-
0400
110.161
5.80
(147.31
MAX
4.48
5.10
6.43
~
-I
026
16.601
1113.BI
(129.51
SIDE VIEW
(163.31
Figure 9. AD2036 Mechanical Outline
(Dimensions shown in inches and (mm))
c==::BLOCK TENSION
SCREW
0'
PANEL THICKNESS
0.0625 to 0.125
(1.61 to 13.21
SHROUD
--,
MOUNTING
INSTRUCTIONS,
1. SLIDE DPM THROUGH
PANEL CUTOl'T
FROM FRONT OF PANEL.
2. SNAP MOUNTING
BlOCK
INTO SLOT ON DPM SIDES.
3. TIGHTEN MOUNTING
BLOCK TENSION SCREWS SNUGLY TO
SECURE DPM TO PANEL (DO NOT OVERTIGHTEN!)
4. SNAP LENS ONTO FRONT OF DPM.
Figure 10. AD2036 Mounting Instructions
(Dimensions shown in inches and (mm))
264 TRANSDUCERS
,
SPAN ADJUST
OLE
TOP VIEW
AND REFERENCES
0.36
19.71
TE