Vaisala HMP 35A, HMP35D Operating Instructions Manual

Operating instructions

Manuel d'utilisation

Bedienungsanleitung

Kaytt6ohje

HMP 35A & HMP 350

Sondes de mesure de
temperature et d'humidite

Humidity and

temperature probes

Mel"Ssonden fur Feuchte

und Temperatur

Kosteus- ja lamp6tila-

mittapaat

Doc. no. HMP35A-OO217-2.1

~+} VftlSftLft

SENSOR SYSTEMS

more often, depending on the conditions of use and
desired accuracy. A one-point calibration may be per­formed for the probes during actual measurement by
adjusting the trimmer potentiometer marked "DRY" in
the probe shaft. The field calibration can be performed

against a calibrated Vaisala humidity meter. For a high-

accuracy two-point calibration use a Vaisala HMK 11
calibrator and saturated salt solutions as described in
the HMK 11 Operating Manual. The calibration is first
done for the dry end and then for the wet end by
adjusting trimmer potentiometers marked "DRY" and
"WET". The potentiometers are located under a protec­tive plug in the probe handle, see Figure 3. (Note: the

minimum output signal of 0.002 V corresponds to a

relative humidity of 0.2 %RH.)

Replacing the H-sensor
Detach the damaged sensor and replace it with a new

one. Handle the sensor with care. Calibrate the probe,

preferably using two-point calibration, before taking it

into use.

Chemical tolerances of the H-sensor

Long-term exposure of the sensor to certain chemicals

and gases may shorten sensor life and change its
properties. The following list give suggested maximum

ambient concentrations for some typical chemicals:

1. Organic solvents 1000...10000 ppm (typ.)
Aggressive chemicals

(e.g. strong acids such
as S02' H2SO4' H2S,
HCI, C12, etc.)

2

1...10 ppm (typ.)

100...1000 ppm (typ.)

10000...100000 ppm (typ.

3,

Weak

acids

Bases4.

Detailed information on allowed concentrations is
available on request from your Vaisala representative.

2

4.

SPARE PARTS AND ACCESSORIES

HMK

11 calibrator

Radiation shield

0062

10429

2787
6685
6686
6597

HMP 35A
HUMICAP@ H-sensor

Temperature sensor Pt 100

(1/3 DIN 43760B)

Membrane filter
Sintered filter 37 ~m
Sintered filter 216 ~m

Plastic grid

HMP 35D

0062
10429

HUMICAP@ H-sensor

Temperature sensor Pt 100

(1/3 DIN 437608)
Membrane filter, chromium-plated

Sintered filter 37 ~m
Sintered filter 216 ~m

16126
6685
6686

5.

TECHNICAL SPECIFICATIONS

HMP

35A & HMP 35D

0 ...100 %RH

0.002 ...1 VDC

(equals 0.2 ...1

Measurement range
Output signal range

00

% RH)

%RH

:t

Accuracy at +20 °C
(including nonlinearity

and hysteresis)

.against factory

references

.against field references

:t2 %RH (0 .,
:t3 %RH (90

90 %RH)
.100%RH)

3

Temperature dependence :to.04 %RH/oC
Typical long-term stability better than 1 % RH per year

Response time 15 s with membrane filter

(at 20 °C, 90 % response)
Settling time 1 s
Sensor HUMICAP@ H-sensor

(part no. 0062)
Pt 100 (1/3 DIN 43760B,

four-wire connection)

7...35VDC
$:4 mA

-40 ...+60 °C
IP 55 (NEMA 3S)

IP 65 (NEMA 4) *
180g

radiation shield

Temperature sensor

Supply voltage

Current consumption

Operating temperature

Protection class

Weight

Accessories

HMP 35A
Sensor protection

.standard

.optional

membrane filter

(part no. 2787)

plastic grid (part no. 6597)
sintered filter 37 ~m

(part no. 6685)
sintered filter 216 ~m

(part no. 6686)

ASS plastic

1600 mm

Housing material
Cable length

HMP 35D

IEC 801-3 standard, level 2

E.M.I. protection

Sensor protection
.standard

membrane filter,

chromium-plated (part no.

2787)

Sensor protection
.optional

Housing material

sintered filter 37 ~m

(part no. 6685)
sintered fi1ter 216 ~m
(part no. 6686)

chromium-plated ASS
plastic

3500 mm

Cable length

(* For details, consult your Vaisala representative.

Information and specifications in this manual subject to

change withough prior notice.

Copyright Vaisala Oy, 1991.

HUMICAP@ is a registered trademark of Vaisala.

5

HMP

35A

Fig. 3

Fig. 3

Bild 3
Kuva 3

Electrical connections
Connexions electriques
Elektrische Anschlu~e

Sahk6iset liitannat

r

Dimensions, H M P 35A & H M P 35D
Dimensions, H M P 35A & H M P 35D
Mar5e, HMP 35A & HMP 35D

Mitat, HMP 35A & HMP 35D

Fig. 1

Fig. 1

Bild 1

Kuva 1

HMP 35A
1600 mm

HMP 350
3500 mm

Cable length
Longueur du cable
Lange des Kabels

Kaapelin pituus

HMP 35D

Fig. 4
Fig. 4
Bild 4

Kuva 4

Electrical connections
Connexions electriques
Elektrische AnschlOBe
Sahk6iset liitannat

-(,

,~

-

SHIELC

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