Minco TT859 Operating Instructions

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TT859 TemptranTM

2-wire Temperature Transmitter for RTD Thermometers

Installation and Operating Instructions

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Description

Model TT859 is a 2-wire temperature transmitter for RTD (Resistance Temperature Detector)
thermometers. The TemptranTM converts the RTD's signal into a 4 to 20 mA DC 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 TT859 is FIELD RANGEABLE; the Zero and Span are adjustable
over -10 to 60°F and 35 to 150°F respectively allowing for re-ranging by means of a simple
calibration process.

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Specifications

Sensing Element:

1000 ohm @ 0°C platinum RTD, 0.00375 ohm/ohm/°C TCR or

0.00385 ohm/ohm/°C TCR.

Output:

4 to 20 mA DC over specified range.

System Accuracy:

± 0.5°F (± 0.3°C) @ room temp or ± 0.8% of span operating @
24 VDC.

Transmitter Linearity:

± 0.1% of span.

Rangeability:

Zero: -10 to 60F (-23° to 15°C).
Span: 35 to 150F (19° to 83°C).

Housing:

2.75” W x 4.50” H x 1.56” D. Bone white plastic cover and

baseplate with anodized aluminum endplates. Suitable for
indoor use only.

Operating Environment:

-40° to 185°F (-40° to 85°C), non-condensing.

Storage Environment:

67° to 212°F (-55° to 100°C), non-condensing.

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:

9.4 to 35 volts DC, non-polarized.

Input Voltage Effect:

± 0.001% of span per volt from 9.4 to 35 VDC.

Maximum Load

Resistance:

The maximum allowable resistance of the signal-carrying loop,
including extension wires and load resistance, is given by this
formula: Rloop max = (Vsupply-9.4)/.02 amps. For example, if
the supply voltage is 24 VDC, the loop resistance must be less
than
730 .

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).

Weight:

3.0 oz. (84 grams) Transmitter and housing.

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Installation

Installation of the TT859 consists of mounting the transmitter to a wall and connecting it to
power. The housing is mounted using two countersink screws to secure the base plate to a
wall. Access the mounting holes by separating the plastic base plate from the cover. Then
secure the base plate to the wall, long edge to the vertical (observing the directional arrow
marked on the base plate). Power and RTD wires are connected to the transmitter by 4 screw

terminals located near the edge of the circuit board (Figure 1). The transmitter’s power and

RTD connections are designed for non-polar hook-up, so polarity is not important. If
calibration is necessary, set dip-switches before assembling housing (See Transmitter Ranging
section).

Connect a DC source, not exceeding 35 VDC, to the “PWR” terminals as shown below (Figure

1).

Wiring Diagram

Figure 1

Power Supply

DC power supply requirements are determined by the TT859’s minimum voltage requirement
and voltage drop across the load resistor and installation lead wires.

Example: The transmitter requires 9.4 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 14.9 VDC.

Using a 24 VDC power supply will take care of nearly all installations, but the TT859 will operate
at voltages up to 35 VDC.

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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.

DECADE
BOX

SPAN ADJ.

ZERO ADJ.

4-20 mA
LOOP

mA

INDICATOR

24 VDC
POWER SUPPLY

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 Minco’s 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 30 to 90°F has a Zero of 30°F and a Span of 60°F (90-30).
Table 1 shows the closest Zero range is 30°F with switches 1 through 4, respectively, in the OFF,
ON, ON, and OFF positions. Likewise, Table 2 shows the closest Span range is 57°F with
switches 5 through 8, respectively, in the ON, ON, OFF, and OFF positions. Once the switches

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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 down to 4mA with the 30°F Zero switch settings, then the Zero switch settings should
then be changed to 37°F (OFF, ON, OFF and ON) which is the next higher range. Likewise if the
Span trim pot does not have sufficient adjustment, then the Span switch settings should be
changed.

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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.

SPAN *

Switch Settings Center Point

5 6 7 8 °F °C

ON ON ON ON 31 17
ON ON ON OFF 40 22
ON ON OFF ON 47 26
ON ON OFF OFF 56 31
ON OFF ON ON 65 36
ON OFF ON OFF 74 41
ON OFF OFF ON 81 45

ON OFF OFF OFF 90 50
OFF ON ON ON 99 55
OFF ON ON OFF 106 59
OFF ON OFF ON 115 64
OFF ON OFF OFF 122 68
OFF OFF ON ON 131 73
OFF OFF ON OFF 139 77
OFF OFF OFF ON 148 82
OFF OFF OFF OFF 155 86

ZERO

Switch Settings Center Point

1 2 3 4 °F °C

ON ON ON ON -13 -25

ON ON ON OFF -8 -22

ON ON OFF ON -2 -19

ON ON OFF OFF 3 -16

ON OFF ON ON 9 -13

ON OFF ON OFF 12 -11

ON OFF OFF ON 18 -8

ON OFF OFF OFF 25 -4
OFF ON ON ON 28 -2
OFF ON ON OFF 34 1
OFF ON OFF ON 39 4
OFF ON OFF OFF 45 7
OFF OFF ON ON 50 10
OFF OFF ON OFF 55 13
OFF OFF OFF ON 61 16
OFF OFF OFF OFF 66 19

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Resistance vs. Temperature for 1000 Ohm Platinum Sensors

PW = 0.00375 ohm/ohm/°C, PF = 0.00385 ohm/ohm/°C

Table 3

Resistance vs. Temperature for 1000 Ohm Platinum Sensors

PW = 0.00375 ohm/ohm/°C, PF = 0.00385 ohm/ohm/°C

Table 4

Temp. (°F) Sensor 0 -5 -10 -15 -20 -25 -30 -35 -40 -45

0 PW 932.07 921.42 910.76 900.09 ------ ------ ------ ------ ------ ------

PF 930.33 919.41 908.49 897.55 ------ ------ ------ ------ ------ ------

Temp. (°F) Sensor 0 5 10 15 20 25 30 35 40 45

0 PW 932.07 942.71 953.34 963.96 941.57 985.17 995.77 1006.35 1016.92 1027.49

PF 930.33 941.24 952.14 963.04 973.92 984.79 995.66 1006.51 1017.36 1028.20

50 PW 1038.04 1048.59 1059.12 1069.65 1080.17 1090.68 1101.18 1111.67 1122.15 1132.62

PF 1039.03 1049.85 1060.66 1071.46 1082.25 1093.04 1103.81 1114.58 1125.34 1136.08

100 PW 1143.08 1153.54 1163.98 1174.41 1184.84 1195.25 1205.66 1216.06 1226.45 1236.82

PF 1146.82 1157.55 1168.28 1178.99 1189.69 1200.39 1211.07 1221.75 1232.42 1243.08

150 PW 1247.19 1257.55 1267.90 1278.25 1288.58 1298.90 1309.21 1319.52 1329.81 1340.10

PF 1253.73 1264.37 1275.00 1285.63 1296.24 1306.85 1317.45 1328.03 1338.61 1349.18

200 PW 1350.38 1360.64 1370.90 ------ ------ ------ ------ ------ ------ ------

PF 1359.74 1370.30 1380.84 ------ ------ ------ ------ ------ ------ ------

Temp. (°C) Sensor 0 -2 -4 -6 -8 -10 -12 -14 -16 -18

-20 PW 923.55 915.88 908.20 900.52 ------ ------ ------ ------ ------ -----­PF 921.60 913.73 905.86 897.99 ------ ------ ------ ------ ------ ------

0 PW 1000.00 992.38 984.75 977.12 969.48 961.84 954.19 946.54 938.88 931.24

PF 1000.00 992.18 984.36 976.53 968.70 960.86 953.02 945.17 937.32 929.46

Temp. (°C) Sensor 0 2 4 6 8 10 12 14 16 18

0 PW 1000.00 1007.62 1015.23 1022.84 1030.44 1038.04 1045.64 1053.23 1060.81 1068.39

PF 1000.00 1007.81 1015.62 1023.43 1031.23 1039.03 1046.82 1054.60 1062.39 1070.16

20 PW 1075.93 1083.53 1091.10 1098.66 1106.21 1113.76 1121.31 1128.85 1136.39 1143.92

PF 1077.94 1085.70 1093.47 1101.23 1108.98 1116.73 1124.47 1132.22 1039.95 1147.68

40 PW 1151.45 1158.97 1166.48 1174.00 1181.50 1189.01 1196.50 1204.00 1211.48 1218.97

PF 1155.41 1163.13 1170.85 1178.56 1186.27 1193.97 1201.67 1209.36 1217.05 1224.74

60 PW 1226.45 1233.92 1241.39 1248.85 1256.31 1263.77 1271.21 1278.66 1286.10 1293.53

PF 1232.42 1240.10 1247.77 1255.43 1263.09 1270.75 1278.40 1286.05 1293.70 1301.33

80 PW 1300.96 1308.39 1315.81 1323.23 1330.64 1138.04 1345.44 1352.84 1360.23 1367.62

PF 1308.97 1316.60 1324.22 1331.84 1339.50 1347.07 1354.68 1362.28 1369.88 1377.47

100 PW 1375.00 ------ ------ ------ ------ ------ ------ ------ ------ ------

PF 1385.06 ------ ------ ------ ------ ------ ------ ------ ------ ------

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How to Order

TT859

Model Number: TT859

PW

Resistance thermometer type: RTD Temptran

PF = 1000  Platinum (.00385)
PW = 1000  Platinum (.00375)

1

4-20 mA DC Output

S

Temperature Range (4 mA Temp/20 mA Temp):

EN =-20 to 140°F ( -29 to 60°C)
S = 0 to100°F (-18 to 38°C)
A = 20 to120°F ( -7 to49°C)
BI = 30 to130°F ( -1 to54°C)
N = 32 to122°F ( 0 to50°C)
H = 40 to90°F ( 4 to32°C)
SX = Special range as defined on job order – must fall within adjustment limits
of Transmitter.
Consult factory for current list of available ranges.

1

Calibration:
1 = No calibration data, sensor or transmitter
2 = Sensor/Transmitter matched at 0°C with NIST cert
3 = Sensor/Transmitter matched at 0, 100, & 260°C with NIST cert

TT859PW1S1  Sample part number

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Warranty

Items returned within one year from the date of sale, transportation prepaid, which Minco

Products, Inc. (the “seller”) reasonably determines to be faulty by reason of defective materials

or faulty workmanship will be replaced or repaired at the seller’s discretion, free of charge.

This remedy is to be the sole and exclusive remedy available to the buyer in the event of a
breach by the seller. Items that show evidence of mishandling or misapplication may be
returned by the seller at the customer’s expense.

Furthermore, the seller is not to be held responsible for consequential damages caused by this
product except as required under Minnesota Statutes, Section 336.1-719 (3).

This warranty is in lieu of any other expressed warranty or implied warranty of merchantability
or fitness for a particular purpose, and of any other obligations or liability of the seller or its
employees or agent.

Minco (Main Office) Customer Service/ Minco S.A.

7300 Commerce Lane Order Desk: Usine et Service
Minneapolis, MN Tel: [phone] Commercial, Z.I.
55432 Fax: [phone] 09310 Aston, France
USA [e-mail] Tel: [phone]
Tel: [phone] www.minco.com Fax: [phone] Stock # 360-00101(A) 103395
Fax: [phone]

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Dimensions

Figure 3