AM1612 Full Immersion
Platinum Resistance Thermometer
User’s Guide
Please download the latest version at www.accumac.com
Rev. 201609V3
AM1612 Full Immersion PRT User’s Guide
Table of Contents
Before you start ---- Warnings & Cautions ........................................................................ 2
1 Introduction ................................................................................................................ 3
1.1
1.2
1.3
2 Specifications .............................................................................................................. 4
2.1
3 General Operations .................................................................................................... 5
3.1
3.2
3.3
3.4
3.5
3.6
4 Care and Handling Guidelines ................................................................................... 7
5 Troubleshooting .......................................................................................................... 8
5.1
5.2
6 Limited Warranty & Limitation of Liability ............................................................... 9
Main Application ................................................................................................ 3
Main Features ..................................................................................................... 3
Calibrations ......................................................................................................... 3
Specifications ...................................................................................................... 4
Connecting to the readout device ........................................................................ 5
Drive Current ...................................................................................................... 5
Stability of Readings ........................................................................................... 5
Full Immersions .................................................................................................. 5
Thermal EMF ...................................................................................................... 6
Over Heating ....................................................................................................... 6
Troubleshooting .................................................................................................. 8
Problem Causes and Solutions ............................................................................ 8
Rev. 201609V3 1/10
AM1612 Full Immersion PRT User’s Guide
Before you start ---- Warnings & Cautions
Warnings: Follow these guidelines to avoid personal injury:
1. Only use this instrument in the manufacture specified
temperature range.
2. The transition junction and lead wire of this instrument can
become hot when it is used to measure high temperatures for
extended periods of time.
3. DO NOT use this instrument to measure the temperature of
any hazardous live component.
4. Follow all other safety guidelines listed in this user’s guide.
Cautions: Follow these guidelines to avoid possible damage to
the instrument:
1. Avoid mechanical shocks. DO NOT drop or slam the probe in
any way. This will cause damage to the probe internally and
affect its calibration and accuracy.
2. Read Section entitled “Care and Handling Guidelines” before
removing the PRT from the shipping box. Incorrect handling
can damage the PRT and void the warranty.
3. Keep the shipping container in case it is necessary to ship the
PRT. Incorrect packaging of the PRT for shipment can cause
irreparable damage.
4. Calibration Equipment should only be used by Trained
Personnel.
Rev. 201609V3 2/10
AM1612 Full Immersion PRT User’s Guide
1 Introduction
1.1 Main Application
AM1612 Full Immersion Platinum Resistance Thermometer (PRT) is
an interpolating instrument converting temperature to resistance. It
works together with readout device to measure temperature or change
of temperature. It has wide applications for dry-wells or temperature
baths.
1.2 Main Features
High accuracy: 0.05 ºC at 0 °C
Temperature range: : -196 °C to 180 °C
Durable and shock resistance
1.3 Calibrations
It is recommended to calibrate this PRT annually over the full
temperature range. In between annual calibrations, user can check the
drift rate by comparing R0, resistance at 0°C, against the last
calibration results. Refer to specifications section for normal drift rate.
Rev. 201609V3 3/10
AM1612 Full Immersion PRT User’s Guide
2 Specifications
2.1 Specifications
Temperature Range
Resistance at 0 °C
Temperature Coefficient
Accuracy
Drift
Short Term Stability
Thermal Shock
Hysteresis
Self-heating
Response Time
Measurement Current
Sensor Length
Sensor Location
Insulation Resistance
Sheath Material
Dimension
External Leads
Optional Calibration
-196 °C to 180 °C
Nominal 100 Ω
0.00385 Ω/ Ω/°C
±0.05 °C
±0.04°C at 0 °C after 100 hours at 160 °C
±0.02 °C
±0.02 °C after 10 times thermal cycles from minimum to
maximum temperatures
<=0.01 °C
75 mW/°C
4 seconds for 63% response to step change in water moving
at 3 feet per second
1 mA
30 mm
3 mm from tip
>1000 MΩ at room temperature
Stainless Steel (SST) 316L
0.125 inch X 2 inch (3 mm X 50 mm)
Enameled copper wire protected by high temperature heat
shrink tubing, 4 leads, 2.5 meters
NIST traceable calibration and data available per request
Rev. 201609V3 4/10
AM1612 Full Immersion PRT User’s Guide
3 General Operations
3.1 Connecting to the readout device
The AM1612 is equipped with a four-wire cable (see Figure 1). Four
lead wires are used to cancel lead wire resistance. For best results, the
readout device should be equipped to handle four-terminal resistors.
The lead wires can be distinguished by insulation colors. Lead wire
pairs attached to each end of the sensor are identified by red/red and
white/white insulation.
White Red
White
Figure1
3.2 Drive Current
Red
AccuMac recommends 1mA as drive current to ensure the best
measurement.
3.3 Stability of Readings
To achieve the best accuracy, allow sufficient time for PRT to
stabilize before taking the readings.
3.4 Full Immersions
The lead wire and transition junction of AM1612 can withstand the
full temperature range of the PRT. The seal of probe prevents the
ingress of moisture so that the probe can be applied in a humid
condition, or even under full immersion in common heat transfer
fluids such as ethanol, silicone oil and mineral oil.
Rev. 201609V3 5/10
AM1612 Full Immersion PRT User’s Guide
3.5 Thermal EMF
Each AccuMac PRT has gone through an annealing process and
stability test to minimize the thermal EMF, which is caused by either
impurities of sensing element or temperature differentials at lead wires
connection point.
3.6 Over Heating
The sensing element of AM1612 PRT is sealed inside a stainless steel
sheath to ensure the best stability and repeatability. The seal can be
breached if the PRT is over heated for an extended period of time.
Rev. 201609V3 6/10
AM1612 Full Immersion PRT User’s Guide
4 Care and Handling Guidelines
1. DO NOT subject the PRT to any physical shocks and vibrations.
a. When not using the PRT, keep it in a place that’s not prone
to drop, slam, bang, vibration or other strong physical
contacts. Use a protective box or a carrying case whenever
possible.
b. When shipping the PRT, use protective box and other
protective packaging materials to minimize mechanical
shocks as much as possible.
c. When using dry blocks, make sure the well diameter is
appropriate to allow the PRT move up and down smoothly.
2. DO NOT subject the PRT to any contaminations.
a. Keep the PRT as clean as possible. Avoid contaminations
as much as possible.
3. DO NOT over heat.
a. Do not use PRT above the manufacture specified
temperature range.
b. Do not expose the transition junction and lead wire to
extreme temperatures.
Rev. 201609V3 7/10
AM1612 Full Immersion PRT User’s Guide
5 Troubleshooting
5.1 Troubleshooting
If the PRT functions abnormally, it could be caused by several
possible problem conditions that are described in this section. Try the
solutions recommended and if the problems are still not solved,
contact manufacture for warranty or repair service. Be sure to have the
model number and serial number of your PRT available.
5.2 Problem Causes and Solutions
a. R0 becomes higher significantly. This is likely caused by
mechanical shocks. The PRT should be annealed to release the
stress of platinum wires and to recover R0 value. Measure R0 of
the PRT after annealing to verify.
b. R0 unstable during the measurement. This is likely caused either
by bad connections or sensor coils short. Check the connections
first and if the connections are good, the PRT may be damaged.
Rev. 201609V3 8/10
AM1612 Full Immersion PRT User’s Guide
6 Limited Warranty & Limitation of Liability
The material contained in this document is provided “as is,” and is
subject to being changed, without notice, in future editions. AccuMac
shall not be liable for errors or for incidental or consequential
damages in connection with the furnishing, use, or performance of this
document or of any information contained herein. Should AccuMac
and the user have a separate written agreement with warranty terms
covering the material in this document that conflict with these terms,
the warranty terms in the separate agreement shall control.
AccuMac Corporation provides limited warranty for this PRT product
to be free from defects in materials and workmanship under normal
use and service. The warranty period is 1 year for the Platinum
Resistance Thermometer. The warranty period begins on the date of
the shipment. Parts, product repairs, and services are warranted for 90
days. The warranty extends only to the original buyer or end-user
customer of an AccuMac authorized reseller. The warranty will not
extended to products that have been misused, altered, neglected, or
damaged by accident or abnormal conditions of operation or handling.
To obtain warranty service, contact AccuMac Corporation at:
90 N William Dillard Drive C-107
Gilbert, AZ 85233
USA
Tel: (480) 634-0603
Email: sales@accumac.com
Rev. 201609V3 9/10
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