SKIL Controls - Low Pressure Transmitter/Controller Model 222:

Technical Data

Ordering

The SKIL Controls Low Pressure Transmitter provides an accurate and reliable means of measuring and controlling low positive, negative and differential pressure.

The model 222 is designed to measure pressure conditions within combustion plant can be used to control air flow for optimum combustion efficiency. Specifically designed for boiler, incinerator and furnace applications, it is equally suitable for any inert gas heating and ventilating applications, or energy management systems.

Housed in a weatherproof aluminium enclosure to IP 65, the Model 222 incorporates a robust stainless steel variable capacitance sensor with quality solid state circuits providing accuracy and stability. The unit complies with current EMC and LUD standards.

The Transmitter is available with pressure ranges of ± 0 –5 mm wg (0 to 0.5 mbar) to ± 0 – 1000 mm wg
(0 to 100 mbar).

The Model 222 Transmitter will provide an analogue output signal of 0-10vDC or 0-1 mA or 4-20 mA switch selectable.

The Model 222 Transmitter/Controller will, in addition to transmitting an electrical signal proportional to pressure, provide a control or alarm function with the capability of operating an AC motor or damper actuator within the voltage range of 12 – 240v AC.

The control function utilises solid state relays and a selectable control filter to provide a time averaging proportional control facility.

Outstanding features:

Solid State Circuitry - no mechanical parts, providing high reliability, maintenance free operation.
Robust VRP Transducer - increased sensitivity ideal for flue gas draught measurement.
Self Contained Transmitter/Controller - reduced installation costs, no need for interface relays or contactors.
Standard 4-20mA/0-10Vdc - high accuracy and stability for re-transmission to recorder, logger or EMS.
Solid State Control/Alarm Output - direct switched output to control a.c. motor/actuator.
Selectable filters - for damping draught fluctuations.

Specification:

Environmental

Enclosure : Diecast aluminium Al Si 12, DIN 1725.
Weatherproof to IP 65 Wall mounting.
Length 180, width 140, height 71, excluding fittings.
Pressure connection: 6mm OD compression fittings
Cable entries: 3 off drilled 20.6mm Dia. For M20 x 1.5 pitch or pq 13.5
Operating temperature : -18°C to 65°C
Weight : 1.5 kg net

Electrical

Supply voltage: 115V or 230Vac ± 10% 50/60 Hz
Analogue output current: 4-20mA or 0-1mA switch
Selectable. Max insertion 600 ohms
Analogue output voltage: 0-10V dc.
Max current 5.0 mA
Damping filter time constant: 0.5 to 5 seconds, switch selectable

Control Board (where fitted)

Control switching output: Solid-state relays, 12-80Vac or 80-240Vac (see control options) 2 ampere, resistive.
Damping filter time constant: 0.5 to 5 seconds, switch selectable.
Pressure Ranges: 5 to 1000 mm water gauge. Gauge or differential (0.5 mbar 100 mbar)

Pressure Media

Typically air or similar non-conducting gases.

Transducer

Capacitance principle with stainless steel body and diaphragm and electrode. Ceramic insulator. Internal
temperature compensation.

Performance

Accuracy (see note 1): ±1.2% of full-scale, at constant temperature
Non-linearity (BFSL) ±1% of full-scale
Hysteresis 0.2% of full-scale
Non-repeatability 0.2% of full-scale
Maximum line pressure 10 PSI in positive or negative direction

Thermal effects:
Zero/span shift 0.1% per °C
Compensated range -18 to +65°C
Warm up shift (see note 2): 0.5% of full-scale total

Note 1: Accuracy expressed ad the root sum squares of non-linearity, hysteresis and non-repeatability.
Note 2: While internal temperature compensation becomes effective.

Ordering information and model code:

Key Model Code.

Code: 222
Description: Low Pressure Transmitter/Controller
Supply: 230/115V (selectable) +10% - 15% 50/60 Hz
Output: 0-10V dc standard with 0 to 1mA or 4 to 20mA selectable.

Table 1 - range

Table 2 - control options

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