Comark RF500 Bedienungsanleitung PDF herunterladen (Seite 21)

Category Type

P: Penetration

Surface

A: Air

I: Immersion

Sequential

Code Number

Understanding the Comark probe order code

Connector Types

Connector Type

M: Sub-miniature

L: Lumberg

L8: Lumberg 8-pin,

for N5001

HACCP Auditor

B: Bipole

Sensor Type

K: Type K thermocouple

: Type T thermocouple

X: Thermistor (PST)

P: PT100

P K

Probe Leads

Comark probe leads are matched to the intended applications

for the pr

obe. The materials used are:

PVC – PVC coiled leads provide ease of use in ambient

temperatures of up to +70°C.

FEP and PTFE – These materials are especially suited to food

probes and can be used in sub-zero temperatures. Steel braided

PTFE leads provide greater strength.

Fibreglass (FG) – Fibreglass insulated leads are used for special

application probes where the lead could be subjected to very high

ambient temperatures of up to +400°C.

M: Sub-miniature

B: Bipole

L: Lumberg

L8: 8-pin Lumberg

Thermocouple Limits

Type Temperature Range

K –200°C to +1372°C

N –200°C to +1300°C

T –200°C to +400°C

J –200°C to +1200°C

R, S –50°C to +1767°C

E –200°C to +1000°C

B 0°C to +1820°C

Within the Comark standard probe range you’ll

find probes for general duties as well as ones for

more specialist applications. Try to match the

probe to the job. For example, a low mass flexible

air probe is better suited to accurate air temperature

measurement than a penetration probe which will

take too long to stabilise.

For solid and semi-solid materials use surface

probes for surface measurements. Options include

probes with a bent stem for easier access and

specialist probes for pipe temperatures.

Use penetration or immersion probes to check

internal temperatures. Where holes need to be drilled

in solids, use a thermocouple or thermistor probe

and make sure it’s inserted to at least 6 times

its diameter. You can also use a thermal transfer

compound for improved accuracy.

For liquids use an immersion probe or you can use

certain penetration probes, but check for possible

corrosive effects on the sensor first and agitate the

liquid for a faster response.

For air and other gasses use an air probe.

Response times are affected by heat transfer

around the sensor and the smaller the sensor, the

faster the response time. Response is also affected

by air movement. Damped sensor probes have a

large mass around the sensor to slow response

times so they don’t trigger alarms when fridge or

freezer doors are opened or during defrost cycles.

Choosing the right probe

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