Intech LPN-H-D, LPN-H-F, LPN-H-W Installation Manual

Description.

The LPN-H is a complete relative humidity and temperature sensing module, with two independant loop powered
4~20mA output signals, representing 0~100%RH and 0~100C.
Two versions are available:

(i) Wall mount.

(ii) Duct mount.
Both version come complete in an industry standard aluminium connection head. The relative humidity sensor and
temperature compensating sensor protrude from the head inside a protective cap. This cap allows air to circulate to the
sensors.

Reliability.

The wide operating range of the humidity and temperature sensors offer long term reliability over a broad range of
applications. The sensors resist contaminating vapours such as organic solvents, chlorine, and ammonia.

Ordering Information.

MODEL: LPN-H-D 220mm Duct Mount, 0~100%RH Transmitter, 0~100C Transmitter.

LPN-H-W Wall Mount, 0~100%RH Transmitter, 0~100C Transmitter.
LPN-H-F 100mm Flange for LPN-H-D

Note: 0~200F temperature output optional. Please specify when ordering.

Quality Assurance Programme.

The modern technology and strict procedures of the ISO9001 Quality Assurance Programme applied during design,
development, production and final inspection grant the long term reliability of the instrument.

LPN-H Humidity
and Temperature
Transmitter.

The LPN-H has two independant, 2

wire, 4~20mA loop powered outputs:

One for relative Humidity;

One for Temperature.

4.02-1

Features.





 Dual 4~20mA Outputs.





 Monolithic IC Humidity Sensor.





 %RH Temperature Compensated Linear Output.





 Pt100 RTD Sensor.





 Temperature Output 0~100C. (0~200F Optional)





 Temperature Output Linearised.





 Very Compact Design.





 High Accuracy.





 Low Cost.





 Easy to Install.





 Reverse Polarity Protection.





 Internally Accessible Span & Zero Adjustments.





 Wide Power Supply Range.

LPN-H-D

LPN-H-W

TECHNOLOGY

& QUALITY

A

WAR

D

ISO9001

E

G

I

S

T

E

R

R

E

D

M

A

N

U

A

T

U

R

E

R

C

F

Z495

4.02-2

LPN-H %RH Transmitter Specifications.

Accurate to ±2% FSO Typical. 0~100%RH @ 25C Saturated Salt Calibration.

Important: For continuous measurements of ≥90%RH, refer to note 2 below.
Ambient Temperature Drift <±0.05%/C FSO Typical.
Humidity Sensor -Hysteresis ±0.8% of Span Typical.

-Linearity ±0.5%RH Typical.

-Repeatability ±0.5%RH Typical.

-Long Term Drift ±1%RH Typical at 50%RH in 5 years.

LPN-H Temperature Transmitter Specifications.

Accurate to <±0.1% FSO Typical.
Linearity and Repeatability <±0.1% FSO Typical.
Ambient Temperature Drift <±0.02%/C FSO Typical.
RTD Sensor Pt100 RTD, Class A Din 43760.
Sensor Current 0.5mA.

LPN-H Common Specifications.

Output. 2 wire 4~20mA (Loop Powered).
Power Supply. 9~33Vdc.
Supply Voltage Sensitivity. <±0.01%/V FSO.
Maximum Output Current. Limited to <36mA.
Output Load Resistance. 750Ω @ 24Vdc. (50Ω/V Above 9Vdc).
EMC Compliances Emissions EN 55022-A. Immunity EN 50082-1, <1% Effect FSO Typ.
Isolation Test Voltage Between %RH and Temperature; 50Vdc for 1 min.
Operating Temperature. -at head

A)

0~70C.

-at sensor

B)

-30~85C (LPN-H-D)
Storage Temperature. -30~85C.
Operating Humidity. -at head

A)

5~85%RH Max. Non-condensing.

-at sensor

B)

0~100%RH. Refer note 4 below.

Note:

A)

'at head

' refers to ratings for electronics housed in the connection head.

B)

'at sensor

' refers to ratings for electronics housed in the protective cap.
Note 1. Good airflow and good air mixing must be maintained over the sensor to minimise local temperature fluctuations, and to ensure accurate measurements.
Note 2. The RH sensors quickly recover from condensation or wetting. However, after 24 hours or longer exposures to either high >90%RH or
continuous condensation, an upward shift of 2% to 3%RH may occur. This shift is repeatable and can be reversed by placing the sensor in a low
10%RH environment for a 10 hour period.
CONDENSATION occurs whenever the surface temperature of the sensor's active area drops below the ambient dew point of the surrounding gas.
Condensation forms on the sensor (or any surface) even if the surface temperature only momentarily drops below the ambient dew point. Small
temperature fluctuations near the sensor can unknowingly cause condensation to form when operating at humidity levels above 90%.
While quick to condense, water is slow to evaporate in high humidity conditions. (ie when the surface temperature of the sensor is only slightly above
the ambient dew point.) Because of this, a sensor's recovery from either condensation or wetting is much longer than its normal time response.
During recovery, the sensor outputs a constant 100%RH signal, regardless of the ambient RH.
Product Liability. This information describes our products. It does not constitute guaranteed properties and is not intended to affirm the suitability
of a product for a particular application. Due to ongoing research and development, designs, specifications, and documentation are subject to
change without notification. Regrettably, omissions and exceptions cannot be completely ruled out. No liability will be accepted for errors, omissions
or amendments to this specification. Technical data are always specified by their average values and are based on Standard Calibration Units at
25C, unless otherwise specified. Each product is subject to the ‘Conditions of Sale’.

Warning: These products are not designed for use in, and should not be used for patient connected applications. In any critical installation
an independant fail-safe back-up system must always be implemented.

LPN-H-D Dimensions.

LPN-H-W Dimensions. LPN-H-F Dimensions.

312

4024100

M6 x

8

Mitr e for

O-r ing

countersunk holes

90

Grub Scr e

w

PCD = 90mm

4x6mm

69mm

170mm

44mm

=8mm

50mm Nom.

24mm

160mm nom.

24mm Nom.

50mm Nom.

Intech

INSTRUMENTS LTD

www.intech.co.nz