Dwyer Series AT2DH3 ATEX Approved DH3 Differential Pressure Controller

Product Description

Digihelic® Pressure Control in Flame-Proof ATEX Enclosure

The ATEX approved Series AT2DH3 Digihelic® Differential Pressure Controller is a 3 in 1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output. Combining these three features allows the reduction of several instruments with one product, saving inventory, installation time and money. The ATEX approved Digihelic® controller is the ideal instrument for hazardous area pressure, velocity and flow applications by allowing for the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. Two SPDT control relays with adjustable dead bands are provided along with a scalable 4 to 20 mA process output. In velocity or flow modes, a square root output is provided on the 4 to 20 mA signal to coincide with the actual flow curve. Flame-proof ATEX enclosures are available in aluminum and can include a glass window for viewing process information and set point status on digital display.

Important notes for installation:

• Cables must be fitted through 1/2″ NPT cable gland or ATEX conduit (not supplied with instrument).
• Make sure after cabling to close tight cover and cable gland, in order to keep IP66 rating (IP65 with option OPV, overpressure relief valve).
• Open cover only after de-energizing instrument.
• Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous area.

Product Applications

• Hazardous area pressure measurement and switching

Specifications

Service:

Air and non-combustible,
compatible gases.

Wetted Materials:

Consult factory.

Housing Material:

Die cast aluminum
case and bezel.

Accuracy:

< 5 in w.c. (except ±2.5 in
w.c.): ±1%; All other ranges: ±0.5% at
77°F (25°C) including hysteresis and
repeatability (after 1 hour warm-up).

Stability:

< ±1% per year.

Pressure Limits:

Ranges ≤ 2.5 in w.c.:
25 psi; ±2.5″, 5 in w.c.: 5 psi; 10 in w.c.:
5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi;
100 in w.c.: 9 psi.

Temperature Limits:

32 to 140°F (0 to
60°C) Case: -76 to 140°F (-60 to 60°C)
(Note: Product temperature limits differ
from case).

Compensated Temperature Limits:

32 to 140°F (0 to 60°C).

Thermal Effects:

0.020%/°F
(0.036/°C) from 77°F (25°C).

Power Requirements:

12 to 28 VDC,
12 to 28 VAC 50 to 400 Hz.

Power Consumption:

3 VA max.

Output Signal:

4 to 20 mA DC into
900 ohms max.

Zero & Span Adjustments:

Accessible via menus in safe zone
only.

Response Time:

250 ms (damping set
to 1).

Display:

Backlit 4 digit LCD 0.4″ height
LED indicators for set point and alarm
status.

Electrical Wiring:

Screw terminal.

Mounting Orientation:

Mount unit in
vertical plane.

Dial Size:

5″ (127 mm) OD x 3-1/8″
(79.38 mm).

SWITCH SPECIFICATIONS:

 

Switch Type:

2 SPDT relays.

Electrical Rating:

1 amp @ 30
VAC/VDC.

Set Point Adjustment:

Adjustable via
keypad on face in safe zone only.

Enclosure Rating:

(IP66). IP65 with
option OPV, overpressure relief valve.

Housing Material:

Aluminum.

Finishing:

Texture epoxy coat
RAL7038.

Pressure Connections:

1/8″ NPT
female brass (SS optional). In
presence of acetylene it is necessary
to use SS.

Electrical Connections:

Two 1/2″
FNPT. Cable gland not included.

Weight:

12.3 lb (5.6 kg).

ATEX Approved Products from Comhas with ECN:

BVI 14ATEX0072.

Agency Approvals:

CE 1370 II2
GD Ex d IIC Gb T6; -60°C ≤ Ta ≤
+60°C Ex tb IIIC Db T 85°C.

Features

• 3-in-1 ATEX approved instrument allows the reduction of several instruments with one product, saving inventory, installation time and money
• Flame-proof ATEX enclosure with optional glass window and aluminum housing protects the device in hazardous areas while giving local visibility to process pressure and set point status

Literature

Manuals

Instruction Manual

Catalog Pages

Series AT2DH3 Catalog Page

Approvals

ATEX Certificate

Drawings

• Adobe Reader in format .PDF
• CAD Drawing in format .DWG

Model Chart