Model 218 Cryogenic Temperature Monitor - Technical Specifications

Model 218 Temperature Monitor

Input Specifications

	Sensor Temperature Coefficient	Input Range	Excitation Current	Display Resolution	Measurement Resolution	Electronic Accuracy
Diode	negative	0 V to 2.5 V	10 µA ±0.05% ⁹	100 µV	20 µV	±160 µV ±0.01% of rdg
Diode	negative	0 V to 7.5 V	10 µA ±0.01%⁹	100 µV	20 µV	±160 µV ±0.02% of rdg
PTC RTD	positive	0 W to 250 W	1 mA ±0.3%¹⁰	10 mW	2 mW	±0.004 W ±0.02% of rdg
	positive	0 W to 500 W	1 mA ±0.3%¹⁰	10 mW	2 mW	±0.004 W ±0.02% of rdg
	positive	0 W to 5000 W	1 mA ±0.3%¹⁰	100 mW	20 mW	±0.06 W ±0.04% of rdg
NTC RTD	negative	0 W to 7500 W	10 µA ±0.01%⁹	100 mW	50 mW	±0.1 W ±0.04% of rdg

⁹ Current source error has negligible effect on measurement accuracy
¹⁰ Current source error is removed during calibration

Thermometry
Number of inputs	8
Input configuration	Inputs seperated into two groups of four (each group must be the same sensor type) – inputs can be configured from the front panel to accept any of the supported input types
Input accuracy	Sensor dependent – refer to Input Specifications table
Measurement resolution	Sensor dependent – refer to Input Specifications table
Maximum update rate	16 reading per s total
User curves	Room for 8 (1 per unit) 200-point CalCurves™ or user curves
SoftCal™	Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K; improves accuracy of platinum RTDs to ±0.25 K from 70 K to 325; stored as user curves
Math	Maximum, minimum, and linear equation (Mx + B) or M(x + B)
Filter	Averages 2 to 64 input readings

Sensor Input Configuration

	Diode/RTD
Measurement type	4-lead differential
Excitation	8 constant current sources
Supported sensors	Diodes: Silicon, GaAlAs RTDs: 100 W Platinum, 1000 W Platinum, Germanium, Carbon-Glass, Cernox™ , and Rox™
Standard curves	DT-470, DT-500D, DT-670, CTI-C, PT-100, and PT-1000
Input connector	25-pin D-sub

Front Panel
Display	4 line by 20 character backlit LCD display
Number of reading displays	1 to 8
Display units	K, ºC, V, and W
Reading source	Temperature, sensor units, max, min, and linear equation
Display update rate	All displayed inputs twice in 1 s
Temp display resolution	0.001º from 0º to 99.999º, 0.01º from 100º to 999.99º, 0.1º above 1000º
Sensor units display resolution	Sensor dependent to 5 digits
Display annuciators	Remote operation, alarm, data logging, max, min, and linear
Keypad	Membrane keypad, 20-key, numeric and specific functions
Front panel features	Front panel curve entry and keypad lock-out

..........................................................................................
You may also be interested in...
	Cryogenic Temperature Sensors
	Measure temperatures from <20 mK to over 1,500 K. A wide selection of diodes, RTDs, thermocouples, and mounting packages are available. Click here for more information on cryogenic temperature sensors.
	Cryogenic Accessories
	Cryogenic and temperature measurement accessories include cable, wire, solder, heaters, insulating and conductive materials, and more. Click here for more information on cryogenic accessories.

Interface
IEEE-488.2 interface (218S)
Features	SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate	To 16 readings per s
Software support	LABVIEW™ driver
Serial interface
Electrical format	RS-232C
Max baud rate	9600 baud
Connector	9-pin D-sub
Reading rate	To 16 readings per s (at 9600 baud)
Printer capability	Support for serial printer through serial interface port used with data log parameters
Alarms
Number	16: high and low for each input
Data source	Temperature, sensor units, and linear equation
Settings	Source, high setpoint, low setpoint, deadband, latching or non-latching, and audible on/off
Actuators	Display annunciator, beeper, and relays (218S)
Relays (218S)
Number	8
Contacts	Normally open (NO), normally closed (NC), and common (C)
Contact rating	30 VDC at 5 A
Operation	Each input may be configured to activate any or all of the eight relays - relays may be activated on high, low, or both alarms for any input, or manually
Connector	Detachable terminal block
Analog voltage output (218S)
Number	2
Scale	User Selected
Update rate	To 16 readings per s
Data source	Temperature, sensor units, and linear equation
Range	±10 V
Resolution	1.25 mV
Accuracy	±2.5 mV
Min load resistance	1 kW (short-circuit protected)
Data logging
Channels	1 to 8
Operation	Data log records can be stored in memory or sent to the printer; stored data may be displayed, printed, or retrieved by computer interface
Data memory	Maximum of 1500 single reading records, non-volatile

General
Ambient temperature	15 °C to 35 °C at rated accuracy, 10 ºC to 40 ºC at reduced accuracy
Power requirement	100, 120, 220, 240 VAC, (+6%, -10%), 50 or 60 Hz, 18 VA
Size	216 mm W × 89 mm H × 318 mm D (8.5 in × 3.5 in × 12.5 in), half rack
Weight	3 kg (6.6 lb)
Approval	CE mark

Home | Products | Ordering/Pricing | Search | Site Map