MODEL 346 INSTALLATION AND OPERATION MANUAL
HA243821
Issue 5 Mar 98
Section 1
Page 1 - 3
1.3 SPECIFICATION (Cont.)
Number of measuring inputs
Up to six
Number of contact (event) inputs
Up to six
Input Types
TC: B, C, E, J, K, L, N, R, S, T, Ni-Ni/Mo
RTD: Pt100, 10Cu, Ni100, Ni120
Voltage: -1V to + 5Vdc (100Vdc with attenuator)
over 8 hardware ranges.
Resolution: 0.01% of hardware range
Minimum span: 4 mV
Maximum span: 6 Volts
Maximum low value: 80% of span
Maximum negative input: -25% of hardware range
DC current: 250 Ohm Shunt
Contact (event) Contact Closure
Input accuracy
±
0.10% of spans >4 mV.
Input impedance (contact input)
> 20 M
Ω
Common mode rejection ratio
120 dB at 50 to 60 Hertz
Normal mode rejection ratio
60 dB at 50 to 60 Hertz
CJC rejection ratio
25:1 minimum
Input isolation
Installation category II; Pollution degree 2 (See Page 1-1)
250 Volts ac
Maximum input voltage
24 Volts, without causing damage.
Linearisations:
TC, RTD,
√
,
3
/
2
and
5
/
2
powers, log and
user-entered curve.
Derived variables option
+, -, x,
÷
, ave, & hi/lo select, hi/lo peak,
3rd order polynomial, log, power,
formulæ for mass flow, humidity, F
0
, RH, ZrO
2
Writing System
6-colour (blue, red, green, black, brown and violet)
disposable dotting head (1/2 million dots each colour).
Retransmission:
1, 2 or 3 isolated, scaled, 4 to 20 mA outputs
Transducer Power Supply:
1 or 2 supplies both giving up to three 24 Vdc, 100 mA
outputs
Memory
Configuration and data stored in EEPROM and battery-
backed RAM.* See section 1.4 below
Communications
RS 422
Chart (100mm calibrated width)
Type: Roll (32 metres) or Z-fold (16 metres)
Speeds: 1 mm/hr up to 1cm/sec
Drive method: Stepper motor
Drive accuracy 1 cm over 32 metres
Configuration method
at recorder: by keyboard and associated 40-character fluorescent
display
remotely: Any terminal with serial link.
Display type
40-character, 2-row, vacuum-fluorescent (blue).
Channel update
500 msec for all channels (interpolation available).
Point separation in time axis
0.5 mm for each channel
Pen position resolution
0.2% of chart range
Pen accuracy
0.5% of chart range
* The back-up battery allows RAM data to be retained for approximately one month with power removed form
the recorder. A 'Memory Retention' option is available, which stores all data, indefinitely, in an EEPROM.
