AT2-DH3 – Explosion-Proof ATEX/IECEx Exd Digihelic® differential pressure controller

Quick Overview

ATEX_WEB_COMHAS     logo_iecex

• DH3 transmitter/controller now available from Comhas as single instrument Atex/IECEX approuved
• 3 in 1, digital display gage, control relay switches and transmitter
• Ideal instrument for pressure, velocity and flow applications

Description

AT2-607D specifications

Service: air ir and compatible clean and dry gases.
Wetted parts: consult factory.
DH3 case: die cast aluminum case and bezel.
Temperature limits: DH3®: from 0 to 60°C (32 to 140°F).
Case: from -60 to 60°C* (-76 to 140°F).
Accuracy: <5” w.c. (except ±2.5” 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:
Range ≤ 622.7 Pa (2.5” w.c.) P-max: 172 KPa (25 psi);
Range ±622.7 Pa (±2.5”) and 1245 Pa (5” w.c) P-max: 34.4 KPa (5 psi);
Range 6227 Pa (25” w.c) and 12.45 KPa (50” w.c.) P-max: 34.4 KPa (5 psi);
Range 24.91 KPa (100” w.c) P-max: 62 KPa (9 psi).
Compensated temperature limits: from 0 a 60°C (32 to 140°F).
Thermal effects: 0.036/°C, from 25°C (0,020% of from 77°F).
Power requirements: 12-28 Vdc, 12-28 Vac 50-400 Hz.
Power consumption: 3 VA max.
Output signal: 4-20 mA, max 900 ohm.
Zero & span adjustments: accessible via menus (possible only in safe area).
Response time: 250 ms (damping set to 1). Without considering delay caused by Exd flame arrestors
(up to 90 sec. from full scale to zero depending model and range).
Display: backlit 4 digit LCD 0.4” height LED indicators for set point and alarm status.
Installation: diaphragm in vertical position.
Dial size: 5” (127 mm).
Housing material: alluminium (stainless steel option).
Finishing: texture epoxy coat RAL7038 (only aluminium enclosure).
Electrical wiring: screw terminal.
Electrical connection: 2 x 1/2” NPT F standard (supplied without cable galnd).
Process connections: 1/8” female NPT brass (stainless steel optional).
In case of acetylene presence it is requested to use stainless steel.
Dimensions: see drawing below.
Weight: 5.6 Kg ab.

SWITCH SPECIFICATIONS

Switch type: 2 Relè SPDT.
Rating relay: 1A @ 30 Vac/Vdc.
Set point adjustment: adjustable via keypad on face (possible only in safe zone).
* Operating ambient temperature is defined also according to the options and pressure instrument choosed.

CAUTION FOR USE ONLY WITH AIR OR COMPATIBLE GASES!
CONTACT FACTORY FOR USE WITH GASES, OTHER THAN AIR AND NITROGEN.

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