GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM

DUCT HUMIDITY/TEMPERATURE TRANSMITTER

HTDT SERIES

CABLE GLAND FITTING

THREAD ADAPTER 1/2” NPT TO M16

PRODUCT DESCRIPTION

The duct temperature and humidity transmitter

series uses a highly accurate and reliable

Thermoset Polymer based capacitance humidity

sensor and Platinum RTD temperature sensor

together with state-of-the-art digital linearization

and temperature compensated circuitry to

monitor humidity levels. The sensors are

encapsulated in a 228.60 mm (9”) long by 12.7

mm (0.5”) diameter S/S probe. A 60 micron HDPE

filter protects the sensor for contaminants. A

weatherproof Polycarbonate enclosure is provided

for ease of installation.

TYPICAL INSTALLATION

For complete installation and wiring details,

please refer to the product installation

instructions.

The duct type probes are installed through a hole

in the side of the duct to monitor a single point

humidity within the duct. Install the probe in

a straight section of duct at a suitable distance

downstream from any heating, cooling or

humidification devices.

Mounting tabs on the outside of the enclosure for

ease of installation.

A terminal block connection is provided. for

connection to the Building Automation System.

HUMIDITY SENSOR TYPE

Thermoset polymer based capacitive

TEMPERATURE SENSOR TYPE

1000Ω Platinum, IEC 751, 385 Alpha, thin film

HUMIDITY SENSOR ACCURACY

±2, 3, or 5 %RH (5 to 95 %RH)

TEMPERATURE SENSOR ACCURACY

±0.1% of span

SENSOR RESPONSE TIME

15 seconds typical

MEASUREMENT RANGE

0 to 100 %RH

HYSTERESIS

±1.5 %RH maximum

REPEATABILITY

±0.5 %RH typical

LINEARITY

±0.5 %RH typical

OPERATING TEMPERATURE

-40 to 50°C (-40 to 122°F)

OPERATING HUMIDITY

0 to 95 %RH non-condensing

POWER SUPPLY

18 to 35 Vdc, 15 to 26 Vac

CONSUMPTION

22 mA maximum

INPUT VOLTAGE EFFECT

Negligible over specified operating range

PROTECTION CIRCUITRY

Reverse voltage protected and output limited

OUTPUT SIGNAL

4-20 mA current loop, 0-5 Vdc or 0-10 Vdc (factory configured)

OUTPUT DRIVE @ 24 VDC

Current: 550Ω max

Voltage: 10,000Ω min

INTERNAL ADJUSTMENTS

Clearly marked ZERO and SPAN pots

ENCLOSURE

B: Grey Polycarbonate, UL94-V0, IP65 (NEMA 4X)

F: Same as B, with thread adapter (1/2” NPT to M16) and cable gland fitting

PROBE

230mm (9”) length x 12.7mm (1/2”) diameter s/s with porous filter

TERMINATION

Screw terminal block (14 to 22 AWG)

WEIGHT

220g (7.8 oz) including probe

COUNTRY OF ORIGIN

Canada

SPECIFICATIONS

ACCESSORIES - INCLUDED WITH F STYLE ENCLOSURE

112.5 mm

4.43"

99.7 mm

3.925"

228.60 mm

9”

116.5 mm

4.585"

0.5" NPT

304 Series S/S Probe

53.7 mm

2.115"

12.70 mm

0.50"

60 micron HDPE filter