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TT809 Temptran
TM

2-wire Temperature Transmitterand Housing
Installation and Operating Instructions




























Minco
Tel: 763. 571.3121 Fax: 763. 571.0927 www.minco.com
2
Description
Model TT809 is a 2-wire temperature transmitter for RTD (Resistance Temperature Detector) thermometers. The
Temptran
TM
converts the RTD's signal into a 4 to 20 mA current. The current changes according to the range in which the
Temptran is calibrated: 4 mA at the lowest temperature of the range, rising to 20 mA at the top of the range. The leads
that supply power also carry the current signal. The TT809 is FIELD RANGEABLE; the Zero and Span are adjustable over -
50 to 212°F and 30 to 320°F respectively allowing for re-ranging by means of a simple calibration process. The gasketed
metal housing provides excellent weather resistance and is easily installed using the attached mounting brackets.
Request Minco Application Aid 15 for more general information on transmitters.





Specifications
Sensing Element:
2-wire 1000 ohm @ 0°C platinum RTD, 0.00375 or 0.00385 ohm/ohm/°C TCR.
Output:
4 to 20 mA DC over specified range.
Calibrated Accuracy:
+/- 0.1% of span (0.75% span overall matched to sensor).
Transmitter Linearity:
+/- 0.1% of span.
Rangeability:
-50
°
to 212
°
F (-45° to 100°C). Span: 30
°
to 320
°
F (17° to 180°C)
Housing:
4.5 L x 2.75 W x 2.25 cast alloy, moisture-resistant housing with three 1/2 NPT
integral conduit bosses, gasketed cover and adjustable mounting brackets.
Suitable for outdoor use.
Operating Environment:
-40 to 185°F (-40 to 85°C).
Storage Environment:
67 to 212°F (-55 to 100°C).
Ambient Temperature Effects:
+/- 0.01% Span/°F (+/- 0.018% Span/°C).
Warm-up Drift:
+/- 0.1% of span max., assuming Vsupply = 24 VDC and Rloop = 250 ohms.
Stable within 15 minutes.
Supply Voltage:
8.5 to 35 volts DC with no load.
Input Voltage Effect:
+/- 0.001% of span per volt.
Maximum Load Resistance:
The maximum allowable resistance of the signal-carrying loop is given by this
formula: Rloop max = (Vsupply-8.5)/.02 amps
System Integration:
Output High (22-25mA) with sensor open. Output Low (3.3-3.7mA)
with sensor shorted.
Zero and Span Adjustment:
Non-interacting.
Maximum Output Current:
28 mA.
Power Connections:
Screw terminals, non-polar (connect either way).
Sensor Connections:
Screw terminals, non-polar (connect either way).
Universal Spares:
Temperature ranging via. dip switches. Spare transmitter will cover any range.
Weight:
9.3 oz. (263 grams) Transmitter and housing.



Minco
Tel: 763. 571.3121 Fax: 763. 571.0927 www.minco.com
3
Installation
Installation of the TT809 consists of mounting the transmitter and connecting it to power. The housing is mounted using
two fold-out tabs on the bottom. Power and RTD wires are connected to the transmitter by 4 screw terminals located
near the edge of the circuit board (Figure 1). The transmitters power and RTD connections are designed for non-polar
hook-up, so polarity is not important. Locate the Temptran near the RTD in an area where the ambient temperature stays
between -40 and 85
°
C (-40 and 185
°
F). If calibration is necessary, set dip-switches before sliding transmitter circuit
board into metal housing (See Transmitter Ranging section).

1.

Connect a 1000 ohm RTD to the RTD terminals as shown below (Figure 1).

2.

Connect a DC source, not exceeding 35 VDC, to the PWR terminals.




Wiring Diagram















Figure 1









Power Supply
DC power supply requirements are determined by the TT809 minimum voltage requirement and voltage drop across the
load resistor and installation lead wires.

Example: The transmitter requires 8.5 Volts minimum. A typical 250 ohm load resistor drops 5.0 Volts @ 20 mA. Allowing a
margin of 0.5 Volts for the supply permits 25 ohms of lead wire resistance for remote installation. Totaling these, we get a
minimum power supply requirement of 14 VDC.

Using a 24 VDC power supply will take care of nearly all installations, but the TT809 will operate with as much as 35 VDC.



Minco
Tel: 763. 571.3121 Fax: 763. 571.0927 www.minco.com
4
Calibration Procedure
1.

Connect the equipment as shown below (Figure 2) substituting a resistance decade box, with resolution of at least
0.01 ohm, in place of the RTD.










Figure 2


2.
Determine sensor resistance corresponding to the lower and upper temperature range of the transmitter from
Tables 3 and 4 (page 6). Using RTD Calc a more complete resistance vs. temperature chart can be printed;
Download it from Mincos web site, www.minco.com.
3.
Set the decade box to the resistance value corresponding to the lower temperature. Adjust the Zero pot until the
milliammeter reads 4.0 mA +/- 0.016 mA.
4.
Set the decade box to the resistance value corresponding to the upper temperature. Adjust the Span pot until the
milliammeter reads 20.0 mA +/- 0.016 mA.
5.
Set the decade box to the resistance value corresponding to the lower temperature and verify that the milliammeter
still reads 4.0 mA +/- 0.016 mA. Correct if necessary, then repeat steps 4 and 5.




Transmitter Ranging
The transmitter is initially calibrated to a specific temperature range, as shown on the label attached to the housing.
Unless a different range is desired, ranging is not necessary. If the temperature range is changed, recalibrate the
transmitter as described in the section, Calibration Procedure.

When a different temperature range is desired, Tables 1 and 2 (Page 5) provide range switch settings corresponding to
the various temperature ranges. Switches 1 to 4 set the lower temperature limit (Zero) of the transmitter. Switches 5 to 8
set the upper minus lower temperature (Span) of the transmitter.

For example, a temperature range of 50 to 200°F has a Zero of 50°F and a Span of 150°F (200-50). Table 1 shows the
closest Zero range is 58°F with switches 1 through 4, respectively, in the ON, OFF, OFF, and ON positions. Likewise, Table
2 shows the closest Span range is 155°F with switches 5 through 8, respectively, in the ON, OFF, ON, and OFF positions.
Once the switches are set, the Zero and Span trim pots should provide sufficient adjustments to calibrate the transmitter.

In the event that the trim pots do not have sufficient adjustments, the switch settings should then be changed. In the
above example, if the Zero trim pot cannot adjust the transmitter current up to 4mA with the 58°F Zero switch settings,
then the Zero switch settings should then be changed to 38°F (ON, OFF, ON and OFF) which is the next lower range.
Likewise if the Span trim pot does not have sufficient adjustment, then the Span switch settings should be changed.





Minco
Tel: 763. 571.3121 Fax: 763. 571.0927 www.minco.com
5
Zero Switch Settings

Table 1

Span Switch Settings
(Upper Minus Lower Temperature Limits)

























Table 2

* Span = Upper - Lower Temperature. # Zero ranges overlap next adjacent range.
Z E R O
S w itch Settings
Cente r Point
1
2
3
4
°F
°C
ON
ON
ON
ON
-60
-51
ON
ON
ON
OFF
-42
-41
ON
ON
OFF
ON
-22
-30
ON
ON
OFF
OFF
-2
-19
ON
OFF
ON
ON
18
-8
ON
OFF
ON
OFF
38
3
ON
OFF
OFF
ON
58
14
ON
OFF
OFF
OFF
78
26
OFF
ON
ON
ON
100
38
OFF
ON
ON
OFF
120
49
OFF
ON
OFF
ON
140
60
OFF
ON
OFF
OFF
160
71
OFF
OFF
ON
ON
181
83
OFF
OFF
ON
OFF
202
94
OFF
OFF
OFF
ON
223
106
OFF
OFF
OFF
OFF
244
118
S P A N *

Switch Settings

Center Point

5

6

7

8

°F

°C

ON

ON

ON

ON

34

19

ON

ON

ON

OFF

58

32

ON

ON

OFF

ON

82

46

ON

ON

OFF

OFF

106

59

ON

OFF

ON

ON

131

73

ON

OFF

ON

OFF

155

86

ON

OFF

OFF

ON

178

99

ON

OFF

OFF

OFF

202

112

OFF

ON

ON

ON

224

124

OFF

ON

ON

OFF

247

137

OFF

ON

OFF

ON

270

150

OFF

ON

OFF

OFF

294

163

OFF

OFF

ON

ON

317

176

OFF

OFF

ON

OFF

339

188

OFF

OFF

OFF

ON

362

201

OFF

OFF

OFF

OFF

384

213



Minco
Tel: 763. 571.3121 Fax: 763. 571.0927 www.minco.com
6
Resistance vs. Temperature for 1000 Ohm Platinum Sensors (°F)
PW = 0.00375 ohm/ohm/°C, PF = 0.00385 ohm/ohm/°C


Table 3


Resistance vs. Temperature for 1000 Ohm Platinum Sensors (°C)
PW = 0.00375 ohm/ohm/°C, PF = 0.00385 ohm/ohm/°C


Table 4








Temp. (°F)
Sensor
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
PW
932.07
910.76
889.41
868.01
846.58
825.09
------
------
------
------
PF
930.33
908.49
886.60
864.67
842.71
820.70
------
------
------
------
Temp. (°F)
Sensor
0
10
20
30
40
50
60
70
80
90
0
PW
932.07
953.34
974.57
995.77 1016.92 1038.04 1059.12 1080.17 1101.18 1122.15
PF
930.33
952.15
973.92
995.66 1017.36 1039.03 1060.66 1082.25 1103.81 1125.33
100
PW
1143.08 1163.98 1184.84 1205.66 1226.45 1247.19 1267.90 1288.58 1309.21 1329.81
PF
1146.82 1168.28 1189.69 1211.07 1232.42 1253.73 1275.00 1296.24 1317.44 1338.61
200
PW
1350.38 1370.90 1391.39 1411.84 1432.25 1452.63 1472.97 1493.27 1513.54 1533.76
PF
1359.74 1380.84 1401.90 1422