HD2301
- 11 -
V1.7
C
ALI BRATI ON OF TH E COM BI N ED H UM I D I TY
/
TEM PERATURE PROBE
Ca u t ion !
To calibrat e t he probes correct ly, a know ledge of and abiding by t he
physical phenom ena on which t he m easurem ent is based is fundam ent al: t his is t he
reason why it is recom m ended t o abide by what is report ed below carefully and only
t o perform new calibr at ions if t echnically pr oficient .
The probes are calibr at ed in our laborat ory at 23 ° C at t he point s of 75% RH, 33% RH
and 11.4% RH. On request , t he probes can be checked at different isot herm s.
Th e ca libr a t ion of t h e t e m pe r a t ur e se n sor by t h e use r is n ot r e qu ir e d: t he
se nsor is ca libr a t e d in t h e fa ct or y a nd t h e Ca lle n da r Va n D use n pa r a m e t e r s
a r e r e cor de d in t h e SI CRAM m odu le .
I n or de r t o ca libr a t e t h e in st r u m e n t cor r e ct ly, it is v e r y im por t a n t for t he
pr obe a n d t h e sa t ur a t e d solu t ions t o m a in t a in t h e sa m e t e m pe r a t u r e a n d t h a t
t h is is a s st a ble a s possible du r in g t h e e n t ir e ca libr a t ion ope r a t ion .
Ca libr a t ion se qu e n ce :
1. Unscrew t he sensor prot ect ion on t he t op of t he probe.
2. I n its place screw t he bored cap with the t hreaded ring very well at t he base ( t here
are two t ypes of t hread: M24x1.5 and M12x1, so use the appropriate one) .
3. Open t he cap for t he 75% RH sat urat ed solut ion.
4. Should t here be any drops of solut ion inside t he m easuring cham ber, dry t hem
wit h som e blot t ing paper.
5. I nsert t he probe in t he cont ainer, m ak ing sure t he cap at t he base is screwed
well.
Th e m e a sur in g ch a m be r m u st be close d pe r fe ct ly , ot h e r w ise it w ill
n ot ge t sa t u r a t e d
: it is essent ial t hat no air passes t hrough it .
6.
W a it a t le a st 3 0 m in ut e s
.
7. Press sim ult aneously t he
D ATA
and
UN I T k e ys
t o open t he m enu;
8. Press
DATA/ EN TER
to reach t he second m enu item : t he m essage
"PROB_CAL_EXI T_OR_75_OR_33_OR_11" is shown in t he upper part of the
display.
9. To proceed wit h t he calibrat ion:
•
using t he
and
arrows, select
7 5 %
( placed respect ively upper t he HOLD
and REL keys;
•
confirm by pressing
D ATA/ EN TER
.
N OTE
: t o exit w it hout calibrat ing t he probe, use t he
and
arrows unt il
t he m essage " nonE" appears in t he cent ral display and press
UN I T
.
•
t he relat ive hum idit y read by t he probe is shown;
•
if necessary, correct t he value of t he sat urat ed solut ion against t he 75.0%
proposed by t he inst r um ent using t he arrows
and
.
The
t em perat ure
is t hat m easured by t he Pt 100 or TC sensor.
To con fir m t h e ca libr a t ion poin t :
•
press
D ATA/ EN TER.
The inst rum ent ret urns t o t he calibrat ion m ain page
and displays " nonE" . To proceed wit h anot her point , select it using t he
arrows and confirm w it h UNI T.
10. To ret urn t o m easurem ent m ode, use t he
and
arrows unt il t he m essage
" nonE" appears in t he cent ral display and press
UN I T
.
11. Remove the probe from the 75% RH container and close it im m ediately using its cap.
