MODEL Q

PRECISION PLATINUM RESISTANCE THERMOMETER STANDARDS

TemModel 'Q' Precision Platinum Resistance Thermometer Standards are specifically designed for
precise temperature measurement in industrial and scientific applications over the range -100 deg C
to + 650 deg C.

They are intended primarily for use in Standards Laboratories and are capable of maintaining a very
high order of performance when correctly used and stored. The units must not be subjected to undue shock or vibration and should be handled with extreme care if the calibration is to be maintained over long periods.

Each thermometer is supplied in a specially designed transit and storage case to minimise mechanical shock.

Each thermometer is identified with coding information and serial number. Special versions can be offered to suit customers exact mechanical or electrical specifications..

Fused Quartz Sheath


The Model 'Q' will be supplied with 2 metres of cable as standard, and terminated using individual spades.

Temperature Characteristics
(W Value) 1,3925 minimum

Operating Temperature -100 to +650 deg C

Element 50mm long unconstrained coil, nominal resistance at 0deg C 25.5 ohms

Internal Leads Four - wire platinum

External Leads 4-leads of silver plated copper wire, 19/0,15mm, PTFE insulated with outer
screen with PTFE cover, fitted with 4 spade connectors and spade connected to screen .

Performance Each thermometer is supplied with a certificate giving resistance values as requested

Guarantee by the customer , and obtained by comparison calibration against NPL certified standards.

Reproducibility +/- 0.01 deg C (0.001 ohms)

Measuring Current 1 milliampere

Immersion depth 200 mm is recommended minimum

Immersion Effect Approximately +/- 0.001 deg C when changing from 100 to 250mm immersion

Handle 85 deg C maximum. Do not immerse beyond the sheath marking when using at

Temperature 400 deg C or more.

Material Fused quartz sheath, Stainless steel fittings

Handle; 115 x 25mm (nominal )Nylotron

MODEL "Q "

CALIBRATION OF MODEL 'Q' THERMOMETERS;
Each thermometer will be calibrated as requested by the customer, at temperature's
offered below.

• a) Calibration at the Triple Point of Water (t68 = +0.01 deg C)
• b) Calibration at Freezing Point of Tin (t68 = 231.968 deg C)
• c) Calibration at Freezing Point of Zinc (t68 = 419.58 deg C)
• d) Bath Calibration between -85 deg C and +300 deg C 650 degC
• e) Provision of a calibration print-out over requested temperature range and intervals,
  giving resistance values derived from measurements at 0 deg C , 100 deg C and an assumed
  value of Delta.
• f) Provision of a print-out of W values in 1 deg C steps, using the calibration values obtained
  at 0 deg C , 100 deg C and Zinc Point.
• g) Sensing Devices Ltd are able to calibrate against standards traceable to NPL, and to
  certificate the results with a UKAS accredited certificate.
• h) A protective case is provided and recommended for transit and storage of the
  Thermometer.
• i) Please direct your orders and enquiries to:-
  
  Please direct your orders and enquiries to:-
  
  SENSING DEVICES LIMITED , 97 TITHEBARN ROAD, SOUTHPORT, PR8 6AG
  TEL: (44) 0 1704 546161 FAX; (44) 0 1704 546231
  email: sales@sensing-devices.co.uk