Product specifications

DS6470 (Rev. F, 1/4/07)

2-19

Vantage Pro2

Accessories

6470

Multi-Purpose Temperature Probe

For the Wireless Leaf & Soil Moisture/Temperature Station (# 6345)

The Multi-Purpose Temperature Probe is for use with the Vantage Pro2 Wireless Soil Moisture/Temperature Station.

The probe is designed to measure soil temperature in order to provide temperature compensation for the Watermark

Soil Moisture Sensor.

The sensor is a precision platinum wire thermistor which produces a resistance change proportional to temperature.

It is epoxy-encapsulated in a 316 alloy stainless steel body with vinyl strain relief. The 22 AWG direct burial cable

is resistant to damage from pests, moisture or UV.

To ensure accurate readings when measuring outdoor air temperature, the Multi-Purpose Temperature Probe should

be shielded from direct sunlight and other sources of reflected or radiated heat. We recommend the use of the

Radiation Shield (#7714) for this purpose.

General

Sensor Type (see Charts) . . . . . . . . . . . . . . . . . . . . . . . . Platinum wire thermistor

Time Constant

In Still Air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 seconds

In Liquid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 seconds

Attached Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . 15' (4.6 m)

Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 AWG direct burial cable, wires stripped and tinned

Recommended Maximum Cable Length (see Note 1)

24 AWG Shielded Cable . . . . . . . . . . . . . . . . . . . . . 800' (242 m)

22 AWG Shielded Cable . . . . . . . . . . . . . . . . . . . . . 1,200' (260 m)

Note: There is no absolute maximum cable length. Increasing the cable length above the recommended maximum length causes an increased measure-

ment error at a rate of approximately +0.24°F (+0.13°C) per 100' (30 m) of 22 AWG cable.

Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316 alloy stainless steel housing with vinyl strain relief

Housing Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.312" diameter x 2.5" long (8 mm diameter x 64 mm long)

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 oz. (128 g)

Sensor Output

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable)

Historical Graph Data and Alarms: 1°F or 1°C (user-selectable)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65°C)

Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) typical

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 to 75 seconds

Input/Output Connections

Black. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Common

White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature (variable resistance to common)