GHM Delta OHM HD2304.0, Operating Manual

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HD2304
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V1.8
W ARN I N GS
1. Do not expose t he probes t o gases or liquids t hat could corrode t he m at erial of t he
sensor or t he probe it self. Clean t he probe carefully aft er each m easurem ent . Som e
pressure probe m odels are suit able for m easurem ent of non- corrosive gases or air
and dry and not liquid only: check t he m em brane com pat ibilit y wit h t he plant fluid.
2. Do not bend t he probe connect ors or force t hem upward or downward. Do not bend
or force t he cont act s when insert ing t he probe connect or int o t he inst rum ent .
3. Do not bend, deform or drop t he probes, as t his could cause irreparable dam age.
4. Always select t he m ost suit able probe for your applicat ion.
5. Do not use t he t em perat ure probes in presence of corrosive gases or liquids. The
sensor cont ainer is m ade of AI SI 316 st ainless st eel, while t he cont act probe
cont ainer is m ade from AI SI 316 st ainless st eel plus silver. Avoid cont act bet ween
t he probe surface and any st icky surface or product t hat could corrode or dam age it .
6. Above 400° C and below –40° C, avoid violent blows or t herm al shocks t o Plat inum
t em perat ure probes as t his could cause irreparable dam age.
7. To obt ain reliable m easurem ent s, t em perat ure variat ions t hat are t oo rapid m ust be
avoided.
8. Tem perat ure probes for surface m easurem ent s ( cont act probes) m ust be held
perpendicular against t he surface. Apply oil or heat - conduct ive past e bet ween t he
surface and t he probe in order t o im prove cont act and reduce reading t im e.
What ever you do, do not use wat er or solvent for t his purpose. A cont act
m easurem ent is always very hard t o perform . I t has high levels of uncert aint y and
depends on t he abilit y of t he operat or.
9. Tem perat ure m easurem ent s on non- m et al surfaces usually require a great deal of
t im e due t o t he low heat conduct ivit y of non- m et al m at erials.
10. Pr obe s a r e not insula t e d fr om t he ir e x t e r na l ca sing ; be very careful not t o
com e int o cont act wit h live part s ( above 48V) . This could be ext rem ely
dangerous for t he inst rum ent as well as for t he operat or, who could be
elect rocut ed.
11. Avoid t aking m easurem ent s in presence of high frequency sources, m icrowave
ovens or large m agnet ic fields; result s m ay not be very reliable.
12. Clean t he probe carefully aft er use. Clean t he probe pressure cham ber carefully.
Avoid deposit s or incrust at ions left by t he fluid com ing int o cont act wit h t he
m em brane, as wit h t im e t his could cause m easurem ent errors.
13. Avoid insert ing nails or spikes int o t he pressure cham ber as t he m em brane could be
unint ent ionally t orn.
14. I n order t o fix t he probes, use a suit able fixed wrench, and possibly sealing gasket s.
15. Gr e a t a t t e nt ion m ust be pa id w hile inst alling t he pr obe s in cont aine r s a nd
t ube s unde r pr e ssur e . Also pa y a t t e nt ion t o t he pr obe s’ bot t om
sca le . I n a ddit ion t o t he ir r e par able dam a ge , it ca n e v e n ca use
se r ious physica l da m a ge t o bot h t he ope r a t or a nd t hings. Be for e t he
pr obe a st op va lve should a lw a ys be pr e se nt . Ensur e t ha t t he pla nt is not
subj e ct t o a bnor m a l or une x pe ct e d de pr e sse d fluid fluct ua t ions.
16. The inst rum ent is wat er resist ant and I P67, but should not be im m ersed in wat er.
The probe connect ors m ust be fit t ed wit h sealing gasket s. Should t he inst rum ent fall
int o t he wat er, check for any wat er infilt rat ion. Gent ly handle t he inst rum ent in such
a way as t o prevent any wat er infilt rat ion from t he connect ors’ side.