Honeywell ST 3000 Installation Guide

4.3 Wiring ST 3000 Transmitter, Continued
Approval body
requirements
If your transmitter was ordered with Table III option 3N for self-
declared approval per 94/9/EC (ATEX4), you must use a power supply
that includes a voltage limiting device that will keep the voltage to the
transmitter from exceeding 42 Vdc. You can achieve this by using a
battery as the supply or one of these voltage limiting means.
• Double wound mains transformer per BS 3535 or equivalent.
• An adequately rated zener diode whose voltage is not significantly
higher than the rated voltage.
• An adequately rated semiconductor voltage regulator.
Lightning protection
When your transmitter is equipped with optional lightning protection,
you must connect a wire from the transmitter to ground as shown in
Figure 15 to make the protection effective. We recommend that you use
a size 8 (American Wire Gage) or (8.37mm
2
) bare or green covered
wire.
Figure 15 Ground Connection for Lightning Protection.
Electronics
Housing
Connect to
Earth Ground
Continued on next page
42 ST 3000 Release 300 Installation Guide 2/05

Honeywell ST 3000 Specifications

General

Manufacturer	Honeywell
Category	Transmitter
Stability	±0.01% of URL per year
Operating Temperature	-40 to 85°C (-40 to 185°F)
Communication Protocol	HART
Housing Material	Aluminum or Stainless Steel
Enclosure Rating	IP66/67, NEMA 4X
Measurement Type	Gauge, Absolute, Differential
Output Signal	4-20 mA, HART
Process Temperature	-40 to 121°C (-40 to 250°F)
Hazardous Area Approvals	FM, CSA, ATEX, IECEx
Process Connection	1/2" NPT
Material	316L Stainless Steel, Hastelloy C