Emerson IP221 appendix Sensor specification, Head Amplifiers

4.Specification and Description 4.1 Sensors

Sensor	Minimum	Maximum	Maximum	Fitting	Frequency
Type	Temperature	Temperature	Pressure
	ºC	ºC	Kg/cm2
302S	-70	150	56	R¾”	1
30HS	0	250	50	R1½”	1
312S	-70	130	21	R1”	1
312SP	-70	130	20	R1”	1
323S	-70	130	21	R¾”	1
352S	-70	150	56	R¾”	1
362S	-210	65	70	R¾”	3.75
366S	-210	65	3.5	M6	3.75
373S	-70	150	56	R¾”	1
393S	-70	150	56	R¾”	1
39HS	0	250	50	R¾”	1
402S	-70	150	103	R¾”	3.75
420S	-70	150	280	¾” NPT	3.75
433S	-70	150	105	R¾”	1.20
442S	-70	150	105	R¾”	3.75
HL*S	-70	130	100	Flange	1
				or screw

* Note that 1 kg/cm2 = 100kPa

Table 4.1 - Sensor specification

4.2 Head Amplifiers

Power supply:

Operating frequency:

Gain:

Output:

Temperature Range:

Test Switches:

Normal 11.5V, 12-16mA from the control unit

1 or 3.7 MHz

Potentiometer adjustable, switchable ranges on MEP**I

Current pulses transmitted to control unit in ‘Normal’ mode (270 Hz)

-25 to 85ºC

Optional: MEP* AI, ***S*PI**, ***S*PM** simulates a break in the sensor cables (fault test)

MEP*XI simulates active sensor, stopping pulses (alarm test)

Housing:	i) ***S*PI**: IP54 Aluminium housing, mounted on sensor, Pg 16 cable entries
	ii) ***S*PM**: IP68 Gunmetal or Stainless steel, mounted on sensor, M20 cable
	entries, holds up to two head amplifier circuits.
	iii) MEP*AI: IP65 Polycarbonate, mounted adjacent to sensor
	MEP*XI
Cable:	i) Head amplifier	Not supplied, see Section 2.4 (i) for specification.
		to control sensor
	ii) Sensor to head	MEP* (AI, XI) only, supplied with sensors.
		amplifier
Earthing:	Head amplifier must not be connected to the screen of the control unit cable.
	On adjacent amplifier, the screens of the sensor cables must be connected to the
	head amplifier.
Intrinsic Safety:	Units type MEP3 are intrinsically safe, see table 2.3 for certificate details

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