Omega Products PRS Installation Manual

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OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from
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FOR WARRANTY

RETURNS, please have the following informa-

tion available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was
PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the
product.

FOR NON-WARRANTY REPAIRS,

consult OMEGA for cur­rent repair charges. Have the following information avail­able BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems relative to

the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in
technology and engineering.

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User’s Guide

M12 CONNECTOR STYLE

PRS SERIES SPRING LOADED

Sanitary RTD Sensors

With Thermowells

Shop online at

M4913-K/1209

MADE IN

®

M-4913-K Instruction Manual for M12 Connector Style PRS Series Spring Loaded

Sanitary RTD Sensors With Thermowells

GENERAL DESCRIPTION

The OMEGA PRS series sensors are designed for
use in Sanitary Clean-In-Place (CIP) systems, and
are supplied with a Tri-Grip

®

flanged thermowell
for easy installation into Food, Dairy and
Biopharmaceutical systems. These sensors are
supplied with a stainless steel thermowell, a spring
loaded probe assembly with an M12 connector

When assembled, the probe is spring loaded into
the thermowell. The probe contains a 4-wire
PT100 Platinum RTD (Resistance Temperature
Detector) that meets the resistance vs. temperature
characteristics and Class A requirements of IEC

60751. Equations for calculating resistance vs.
temperature, temperature vs. resistance, and Class
A tolerances are included below the resistance vs.
temperature table.

PROCESS CONNECTION

This sensor has a thermowell that includes a
Tri-Grip

®

flange so it can be installed into existing
process connections. A commercially available
gasket is placed between the thermowell flange and
process connection, with a clamp used to complete
the connection as shown above.
The Thermowell is made from 316L Stainless
Steel, with wetted surfaces that have a surface
finish of 32 microinches or better. Care should be
exercised when handling sensors so that the surface
finish is not damaged during handling or

WIRING CONFIGURATION:

The Omega PRS Style sensors are supplied
with 4-Pin, M12 connectors for convenient
connection to your process instrumentation.
The wiring arrangement of the connector pins
are as shown in the detail below.

For 4-wire PT100 RTD connections, simply
connect the sensor to the instrumentation
using a 4-wire extension cable (not supplied,
Note: RTD sensors have no polarity). This 4­wire device can also be used with 2-wire or
3-wire devices by connecting only to those
pins that are needed (see diagram below).

When used in 3-wire systems, do not twist
or short the C and D pins together since
this will adversely affect your accuracy by
reducing the wire resistance by half.
When used in a 2-wire system, simply
connect to pin A or B, and C or D to
connect across the sensor as shown in the
wiring diagram.)

OPERATING CURRENT:

To insure self heating effects do not occur,
the Omega PRS series sensors should be
powered with no more than 1 milliamp of
excitation current. Although capable of
operating at higher current levels, self heating
effects may occur.

SPECIFICATIONS:
RTD Type: Platinum per IEC-60751.
Accuracy: Class A per IEC-60751.
Temperature Range: -50 to 250°C.
Excitation Current: 1 milliamp max.
Response Time: 2.5 Seconds max (63%).
Wetted Surfaces: 316L Stainless Steel with

10 microinch or better surface finish.

Resistance Vs. Temperature Table: (Resistance Values Stated in Ohms)

Temperature °C

0 1 2 3 4 5 6 7 8 9

-50 80.32 79.92 79.52 79.13 78.73 78.33 77.93 77.54 77.14 76.74

-40 84.28 83.88 83.48 83.09 82.69 82.30 81.90 81.50 81.11 80.71

-30 88.22 87.83 87.44 87.04 86.65 86.25 85.86 85.46 85.07 84.67

-20 92.16 91.77 91.37 90.98 90.59 90.19 89.80 89.41 89.01 88.62

-10 96.09 95.69 95.30 94.91 94.52 94.13 93.73 93.34 92.95 92.55

100.00 99.61 99.22 98.83 98.44 98.04 97.65 97.26 96.87 96.48

0

100.00 100.39 100.78 101.17 101.56 101.95 102.34 102.73 103.12 103.51

10 103.90 104.29 104.68 105.07 105.46 105.85 106.24 106.63 107.02 107.40
20 107.79 108.18 108.57 108.96 109.35 109.73 110.12 110.51 110.90 111.29
30 111.67 112.06 112.45 112.83 113.22 113.61 114.00 114.38 114.77 115.15

40 115.54 115.93 116.31 116.70 117.08 117.47 117.86 118.24 118.63 119.01
50 119.40 119.78 120.17 120.55 120.94 121.32 121.71 122.09 122.47 122.86
60 123.24 123.63 124.01 124.39 124.78 125.16 125.54 125.93 126.31 126.69
70 127.08 127.46 127.84 128.22 128.61 128.99 129.37 129.75 130.13 130.52
80 130.90 131.28 131.66 132.04 132.42 132.80 133.18 133.57 133.95 134.33

90 134.71 135.09 135.47 135.85 136.23 136.61 136.99 137.37 137.75 138.13
100 138.51 138.88 139.26 139.64 140.02 140.40 140.78 141.16 141.54 141.91
110 142.29 142.67 143.05 143.43 143.80 144.18 144.56 144.94 145.31 145.69
120 146.07 146.44 146.82 147.20 147.57 147.95 148.33 148.70 149.08 149.46
130 149.83 150.21 150.58 150.96 151.33 151.71 152.08 152.46 152.83 153.21
140 153.58 153.96 154.33 154.71 155.08 155.46 155.83 156.20 156.58 156.95
150 157.33 157.70 158.07 158.45 158.82 159.19 159.56 159.94 160.31 160.68
160 161.05 161.43 161.80 162.17 162.54 162.91 163.29 163.66 164.03 164.40
170 164.77 165.14 165.51 165.89 166.26 166.63 167.00 167.37 167.74 168.11
180 168.48 168.85 169.22 169.59 169.96 170.33 170.70 171.07 171.43 171.80
190 172.17 172.54 172.91 173.28 173.65 174.02 174.38 174.75 175.12 175.49
200 175.86 176.22 176.59 176.96 177.33 177.69 178.06 178.43 178.79 179.16
210 179.53 179.89 180.26 180.63 180.99 181.36 181.72 182.09 182.46 182.82
220 183.19 183.55 183.92 184.28 184.65 185.01 185.38 185.74 186.11 186.47
230 186.84 187.20 187.56 187.93 188.29 188.66 189.02 189.38 189.75 190.11
240 190.47 190.84 191.20 191.56 191.92 192.29 192.65 193.01 193.37 193.74
250 194.10 194.46 194.82 195.18 195.55 195.91 196.27 196.63 196.99 197.35
260 197.71 198.07 198.43 198.79 199.15 199.51 199.87 200.23 200.59 200.95

For Determining Resistance from
Temperature (0°C and above):
Rt = R0(1 + At + B

t

2

)
where:
R

t

= Sensor Resistance at Temperature (°C)

R

0

= Sensor resistance at 0°C
= (100 Ohms Nominal)
A = 3.9083 x 10

B = 5.775 x 10

-3 °C-1

-7

°C

-2

For Determining Temperature From
Resistance (0°C and above):
t = [sqrt(A2-4B(1-Rt/R0))-A]/2B = °C
where:
t = Temperature at Sensor Resistance R

t

A, B, R0 and Rt per above
Class A Tolerance = ± (0.15 + 0.002t) = °C
With t = temperature in °C regardless to sign.

M-4913-B Instruction Manual for M12 Connector Style PRS Series Spring Loaded

Sanitary RTD Sensors With Thermowells

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