MSA General Monitors S4100T User manual

MODEL S4100T
Hydrogen Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
Smart Transmitter
Hydrocarbon Sulphide
The information and technical data disclosed in this
document may be used and disseminated only for the
purposes and to the extent specifically authorized in
writing by General Monitors.
Instruction Manual 01/18
General Monitors reserves the right to change published
specifications and designs without prior notice.
Part No. MANS4100T-EU
Revision Q/01-18

Model S4100T
i
Warranty Statement
General Monitors warrants the Model S4100T to be free from defects in workmanship or
material under normal use and service within two (2) years from the date of shipment.
General Monitors will repair or replace without charge any equipment found to be
defective during the warranty period. Full determination of the nature of, and
responsibility for, defective or damaged equipment will be made by General Monitors’
personnel. Defective or damaged equipment must be shipped prepaid to General
Monitors’ plant or the representative from which shipment was made. In all cases this
warranty is limited to the cost of the equipment supplied by General Monitors. The
customer will assume all liability for the misuse of this equipment by its employees or
other personnel. All warranties are contingent upon proper use in the application for
which the product was intended and do not cover products which have been modified or
repaired without General Monitors’ approval or which have been subjected to neglect,
accident, improper installation or application, or on which the original identification marks
have been removed or altered. Except for the express warranty stated above, General
Monitors disclaims all warranties with regard to the products sold, including all implied
warranties of merchantability and fitness and the express warranties stated herein are in
lieu of all obligations or liabilities on the part of General Monitors for damages including,
but not limited to, consequential damages arising out of/or in connection with the use or
performance of the product.
Warnings
The instrument should be calibrated at least every 90 days. See sub-section 4.1.
Take note of sub-section 3.4 Sensor Poisons.
Install and maintain all hazardous area equipment in accordance with the relevant
regulations and practices of the country concerned. See Section 3 Installation.
The S4100T must be protected by in-line 500mA PC≥1500A Char “T” fuse is required if
voltage at unit is between 18VDC and 35VDC in the 24 VDC supply line. This is
necessary to fully comply with approval requirements and good installation practices.
Note: General Monitors series of Trip Amplifiers have the 500mA fuse as standard.
The S4100T must be protected by an in-line 63mA; PC1500A Char “F” fuse in the
analogue output line. This is necessary to fully comply with approval requirements and
good installation practices.
WARNING - Installation and Maintenance must be carried out by suitably skilled and
competent personnel only.

Model S4100T
ii
Table of Contents
Page
Warranty Statement i
Warnings i
Table of Contents ii
1.0 Introduction 1
1.1General Description .......................................................................................... 1
2.0 Specifications 2
2.1Approvals .......................................................................................................... 2
2.2Functional.......................................................................................................... 2
2.3Mechanical ........................................................................................................ 3
2.4Environmental ................................................................................................... 3
2.5Electrical............................................................................................................ 3
2.6Factory default settings ..................................................................................... 4
2.7Sensor Material and Specifications when connected to S4100T ..................... 4
2.8Outline Drawing................................................................................................. 5
3.0 Installation 6
3.1On Receipt of your Equipment.......................................................................... 6
3.2Smart Transmitter location Guidelines.............................................................. 6
3.3Sensor Poisons ................................................................................................. 7
3.4Interconnecting cable Guidelines...................................................................... 7
3.5Installation of Sensor ........................................................................................ 8
3.6Installation Instructions ..................................................................................... 8
3.6.1 Smart Transmitter Cable Termination................................................. 8
3.6.2 Cable Termination in Safe Area.......................................................... 9
3.6.3 Cable Termination Drawing .............................................................. 10
3.7Interconnection Details ................................................................................... 12
3.8Power up Routine (see also Section 4.5 and 4.6) .......................................... 12
3.9Stopping Plug Installation ............................................................................... 13
4.0 Operating Instructions ...................................................................................... 15
4.1Menu Operation and Display Codes ............................................................... 15
4.2Tables ............................................................................................................. 17
4.3Calibration ....................................................................................................... 19
4.4 New Sensor Calibration ................................................................................. 20
4.5Calibration Check............................................................................................ 21
4.6Power up Routine............................................................................................ 21
4.7Special Power up Routine............................................................................... 22

Model S4100T
iii
5.0 Maintenance 23
5.1Maintenance.................................................................................................... 23
5.2Storage............................................................................................................ 23
6.0 Trouble Shooting ............................................................................................... 24
6.1Fault codes and Remedies ............................................................................. 24
6.2Alarms ............................................................................................................. 25
6.3Modbus RTU Serial Interface problems.......................................................... 25
7.0 Ancillary Equipment .......................................................................................... 26
7.1Dust Guard Assembly (P/N 10110)................................................................. 26
7.2Sintered Stainless Steel Dust Guard (P/N 1800822-1) .................................. 26
7.3Splash Guard (P/N 10395-1) .......................................................................... 26
7.4Sensor Flow Chamber (P/N 10066)................................................................ 26
7.5Duct Mounting Plate (P/N 10041 Dash-1 or –2) ............................................. 27
7.6Field Calibrator (P/N 50000) ........................................................................... 27
7.7Ampoules of Hydrogen Sulphide (P/N 50004) ................................................ 28
7.8Portable Flow Calibrator Model 1400250 ....................................................... 28
8.0 Modbus RTU Serial Interface ............................................................................ 30
8.1General ........................................................................................................... 30
8.2Modbus Message Characteristics................................................................... 30
8.3Modbus Exception Codes ............................................................................... 30
8.4Modbus Read/Write - Commands................................................................... 31
8.5Modbus Register Configuration ...................................................................... 32
8.5.1 Register 3 .......................................................................................... 32
8.5.2 Register 7 .......................................................................................... 33
8.5.3 Register 9 .......................................................................................... 33
8.5.4 Register 10 ........................................................................................ 33
9.0 Appendix A 34
9.1Maximum Sensor Cable Length...................................................................... 34
9.2Maximum Smart Transmitter Cable Length .................................................... 34
Customer Satisfaction Questionnaire...........................................................................34

Model S4100T
1
1.0 Introduction
1.1 General Description
The General Monitors Model S4100T Smart Transmitter is a highly reliable, self
contained, microprocessor controlled, single point calibration Hydrogen Sulphide
monitor with integral 3-digit readout. The Transmitter is connected to the user’s
indicating and shut-down equipment by means of a screened and armoured cable.
The S4100T is designed to measure and display concentrations of Hydrogen Sulphide
in one of three ranges: 0 to 20ppm, 0 to 50ppm and 0 to 100ppm, but will continue to
display concentrations up to 120% of FSD.
No user adjustments are required. The instrument will record the number of successful
calibrations, compute the sensor resistance in kohm during calibration and store in non-
volatile memory, along with calibration and setup parameters.
The entire electronics modules is fully encapsulated in compliance with the relevant
standards.
The Smart Transmitter’s user interface is menu driven. In addition the instrument may
be addressed via the dual Modbus RTU serial interface.
The accuracy of the Smart Transmitter depends upon routine re-calibration which
should be carried out at least every 90 days. This procedure is extremely simple and
may be carried out by one person aided by prompts from the digital display. Calibration
may be completed in less than 5 minutes. All calibration parameters are tested by
advance software routines before being accepted. Any errors detected will be shown
on the digital display by means of an appropriate fault code.
Hydrogen Sulphide is an extremely dangerous gas. To ensure optimum performance
the sensors should be tested at frequent intervals, especially in areas where risk of
release or leakage is considered to be significant, or in conditions where the sensor
may become blocked or damaged by adverse environmental conditions.
General Monitors is recognised as a leader in the field of gas detection and a team of
experts is always available to provide advice or service as required.

Model S4100T
2
2.0 Specifications
2.1 Approvals
Hazardous Area Standards
EN 60079-0, EN 60079-7, EN 60079-18
Code of Protection
Ex emd IIC T5 Gb (-40C + 55C)
Ex emd IIC T4 Gb (-40C + 70C) Cable insulation rated to at least
110C
Application:
Hydrogen Sulphide Gas Monitor
2.2 Functional
Measuring Range:
0-20 ppm, 0-50 ppm and 0-100 ppm, user selectable option setup
Measuring Resolution
1 ppm
Over-range Indication:
Display flashes for readings greater than 99% FSD, but continues to
display gas concentration up to 120%
Calibration Level:
50% of selected measuring range
A1 Trip Level:
User selectable in 1 ppm increments
1 –19 ppm for 0-20 ppm Measuring Range, default 5 ppm
5 –45 ppm for 0-50 ppm Measuring Range, default 10 ppm
10 –60 ppm for 0-100 ppm Measuring Range, default 25 ppm
A1 Open Collector Output
User selectable Energised/De-energised and Latching/Non-latching
A2 Trip Level:
User selectable in 1 ppm increments
1 –19 ppm for 0-20 ppm Measuring Range, default 10 ppm
5 –45 ppm for 0-50 ppm Measuring Range, default 25 ppm
10 –95 ppm for 0-100 ppm Measuring Range, default 50 ppm
A2 Open Collector Output
User selectable Energised/De-energised and Latching/Non-latching
Fault Open Collector Output
Normally Energised
Analogue Output during Calibration
User selectable 0.0 mA, 1.5 mA and 2.0 mA
Modbus Baud Rate
User selectable 2400, 4800, 9600 and 19200 Baud
Modbus Format
User selectable 1/2 stopbits, odd/even/no parity, 8 databits
Modbus Node Address
User selectable 1 –255; Address 0 is recognised as broadcast mode
Stability, Long Term:
4 ppm or 10% of applied gas whichever is greater (over 21 days)
Accuracy (Linearity)
4 ppm or 10% of applied gas whichever is greater (10C to 50C)
Temperature Variation
4 ppm or 10% of applied gas whichever is greater (-50C to +70C)
Humidity Variation:
4 ppm or 10% of applied gas whichever is greater (5%RH –90% RH)
Response Time
T50< 30 seconds

Model S4100T
3
2.3 Mechanical
Height
150mm (6”)
Height incl. Sensor:
200mm (8”)
Width:
150mm (6”)
Depth:
95mm (3.75”)
Weight including Sensor:
2.5kg (5.5lbs)
Mounting Holes:
4 x 7 mm (0.28”) dia holes
Termination:
Ex e rated Terminal Block
2.4 Environmental
Operating temperature range (continuous) min/max
- 40C to + 70C
Storage temperature range min/max
- 50C to + 85C
Relative humidity min/max:
5% to 100%, non-condensing
Operating Altitude max:
8000 ft
Non-operating Altitude max:
16000 ft
EMI/RFI Susceptibility:
IP Rating:
IP66/67
2.5 Electrical
Supply voltage min/max:
(18.5 VDC / 35 VDC)
Supply voltage abs min/max:
18.5 VDC / 40 VDC
Supply voltage ripple & noise max.
1Vpp
Supply current consumption, including sensor typ/max:
140mA/200mA @ 24VDC
Supply fuse rating: 18VDC –35VDC operation
500mA Chart “T” PC 1500A
Supply voltage low detection threshold min/max:
9.20VDC / 10.32 VDC
Sensor Bias Current (Rsensor + Rcable = zero ohms) max: 420uA
Sensor Resistance range @ 50% FSD
3-80 kohms
Analogue Output Current Range:
0 –22.0mA
Analogue Output Current abs max:
22.1mA
Analogue Output Current Ripple and Noise max.
20uApp
Analogue Output Current Tolerance max:
±50uA
Analogue output termination resistance min/max:
(including total cable resistance)
0 –750 ohms
Analogue output open-circuit detection current range min/max: 1.0mA –22.0mA
Analogue output fuse rating:
63mA Char “F” PC 1500A
Remote calibration input Isink max
2.7mA
Remote calibration input Vin max:
24VDC
Open collector output Isink max
Note: Inductive loads require an external clamp diode
100mA
Open collector output Vin max:
35VDC
Open collector output Vdrop-out @ 100mA max:
1VDC
Meets
EN 50270
EN55011: ENV50204
EN 61000-4-2: EN 61000-4-4: EN 61000-4-6
EN 61000-4-3: EN 61000-4-5: EN 61000-4-8

Model S4100T
4
2.6 Factory default settings
Option
-5 (0-50 ppm)
A1 Trip Level
10 ppm
A1 Open Collector Output:
De-energised and non-latching
A2 Trip Level:
25 ppm
A2 Open Collector Output
De-energised and non-latching
Analogue output during calibration
1.5mA
Modbus Baud rate:
19200 Baud
Modbus Format:
1 stopbit, no parity, 8 databits
Modbus Node address;
1
2.7 Sensor Material and Specifications when connected to
S4100T
General Monitors Sensors (51457-X) are constructed from 316 Stainless Steel. The
temperature and classification becomes
Ex emd IIC T5 Gb (Tamb -40ºC to +55ºC)
Ex emd IIC T4 Gb (Tamb -40ºC to +70ºC) when the sensors are fitted to the S4100T
units only.

Model S4100T
5
2.8 Outline Drawing

Model S4100T
6
3.0 Installation
WARNING - Installation and Maintenance must be carried out by suitably skilled and
competent personnel only.
3.1 On Receipt of your Equipment
All instruments shipped by General Monitors are pre-packed in stout containers and
enclosed in a shock absorbing filling which affords a considerable degree of protection
against physical damage. The contents should be carefully removed and checked
against the enclosed packing slip.
All discrepancies between the contents and the packing slip must be reported to
General Monitors within 10 days of receipt of equipment. General Monitors cannot be
held responsible for shortages not reported within this period.
Damage to the contents of a shipment should be brought to the attention of the carrier
immediately and a claim filed.
All subsequent correspondence with General Monitors must specify the equipment part
numbers and serial numbers.
3.2 Smart Transmitter location Guidelines
The following guidelines should be observed with regard to the location in which to
install a Smart Transmitter.
•Consider how the leaking gas will disperse. Locate the Smart Transmitter where
prevailing air currents are likely to contain the maximum amount of leaking gas,
but sufficiently distant from minor leak sources so as to avoid spurious alarms.
•Hydrogen Sulphide gas is heavier than air and therefore tends to accumulate in
low-lying areas, but do not rely on this property when selecting sensor locations.
The lower concentrations of gas which result from natural dilution in the
atmosphere will be carried along with the prevailing air currents. In general, the
Smart Transmitter should be located close to ground level (but out of the splash
zone) and close enough to the likely leak sources to avoid excessive dilution.
•Site the Smart Transmitter so as to facilitate routine re-calibration; refer to the
Ancillary Equipment Section for details. In particular, ensure that the mounting
allows sufficient clearance for the Field Calibrator (P/N 50000). Ensure that the
mounting allows for the replacement of a faulty sensor and that access to any
accessories is not restricted. Check that the calibration instructions and display will
be visible under all normal weather conditions whenever required. A combination
of rain and sun guard is recommended for outdoor locations because it protects
the Smart Transmitter against the heat of direct sunlight and the adverse effects of
rain-borne grime whilst simultaneously improving display visibility under sunny
conditions.

Model S4100T
7
•Observe the ambient temperature limitations quoted in the specification. If a
sampling preconditioning system is employed, take steps to ensure that vapours
will not condense in the associated pipework.
•The mounting should be as free from shock and vibration as possible. Avoid
mounting Smart Transmitters directly on structures or process equipment prone to
high levels of vibration or shock.
•Select sensor accessories (see Section 7 –Ancillary Equipment) so as to protect
the sensor against high wind velocities, rain, dust, hosing down and any other
anticipated environmental hazards.
•Avoid locations where the Smart Transmitter will be subjected to strong
electromagnetic interference (greater than 10V/m field strength) such as found in
proximity to radio transmitters, welders, switched mode power supplies, inverters,
battery chargers, ignition systems, generators, switch-gear, arc lights and other
high frequency or high power switching process equipment. Walkie-talkie radios
should not be operated at a distance less than 0.75m from the Smart Transmitter.
3.3 Sensor Poisons
H2S Sensors may be adversely affected by prolonged exposure to certain
atmospheres.
Silicones contained in grease or aerosols are the most common coating agents which
are not true sensor poisons, but reduce sensor response.
Other materials that have a deleterious effect on H2S Sensors include mineral acid
vapours and caustic vapours that attack the sensor physically.
The presence of such damaging vapours does not imply that the General Monitors
sensor may not be used in these locations. A careful analysis of ambient air conditions
should be undertaken and the customer should be aware that sensor calibration might
need to be repeated at shorter intervals.
3.4 Interconnecting cable Guidelines
•The Smart Transmitter requires an interconnecting cable with an overall screen
(shield) and armour. Cables to BS5308 Part 2, Type 2 or equivalent are suitable.
•Interconnecting cables should be segregated from power and other “noisy” cables.
Avoid proximity to cables associated with radio transmitters, welders, switched
mode power supplies, inverters, battery chargers, ignition systems, generators,
switch gear, arc lights and other high frequency or high power switching process
equipment. In general, maintain a separation of at least 1m between instrument
and other cables. Greater separation is required where long parallel cable runs are
unavoidable. Avoid running instrument cable trenches close to lightning
conductors earthing pits.
•Complete all cable insulation tests before connecting the cable at either end.
•General Monitors do not recommend the use of cable shoes or crimps on any
junction box or housing wiring terminals. Poor crimping can cause bad connection
when unit experiences temperature variations. We therefore recommend good
practice is to just terminate cable or sensor wires as is, especially in remote
sensor applications.

Model S4100T
8
3.5 Installation of Sensor
General Monitors sensors are machined to a ¾ NPT thread for fixing into the junction
box, through a suitably machined entry. Each sensor requires a suitable O’Ring and
Lock Nut to ensure correct assembly. To assemble the sensor into the junction box the
wires should be placed through the O’Ring, over the ¾ NPT thread until it rests at the
end of the machined thread. The sensor is then placed through the entry of the junction
box and held in place by fitting the ¾ NPT Lock Nut. The sensor should be tightened
sufficiently to ensure a good seal, but not over tightened to damage the O’Ring. The
colour coded wires should then be connected into the corresponding locations of the
connector which is installed and labelled in the junction box. Care should be taken not
to tighten the connection on the insulation of the wires.
3.6 Installation Instructions
3.6.1 Smart Transmitter Cable Termination
•The Smart Transmitter should be installed in accordance with the certification
documents and the relevant regulations of the country concerned.
•Ensure that the gas sensor, if used, points downwards so as to protect it from rain
and the accumulation of deposits.
•Ensure that approved Exe cable glands are used and installed according to the
manufacturer’s instructions.
•The cable glands must be electrically connected to the continuity plate by means
of a suitable nut. The cable armour must be terminated in the gland to ensure a
positive electrical connection.
•The cable screens (drain wires) must all be terminated on the isolated terminal in
the transmitter housing (and sensor junction box if the sensor is mounted
remotely). The cable screens must not be connected electrically to the electronic
circuitry of the Smart Transmitter or the sensor.
•Connect an external earth stud in accordance with local practice if required.
•Ensure no wires cross over the top of the connector blocks as they may become
trapped between the blocks and the electronics module when the lid is fitted.
•When fitting the lid, ensure the fly-lead and earth strap from the electronics
module fit freely into the box. Press the lid home and verify it fits snugly against
the box, before tightening the screws.
•Ensure there is 1mm spacing between insulation of wire and end connector
block. Ensure that insulation is not crimped.

Model S4100T
9
3.6.2 Cable Termination in Safe Area
•The cable armour must be connected to Safety Earth.
•The cable screens (drain wire) and power supply return (OV) must be connected
to Instrument Earth.
•The power supply or power distribution system employed should meet the
requirements of EN5008 I- 1/2 and EN60101-1.
•Power supply or GM Trip Amplifier Power and analogue output must be
fused in accordance with the Smart Transmitter specification.

Model S4100T
10
3.6.3 Cable Termination Drawing

Model S4100T
11
The electrical rating for all open collector outputs is 100mA @ 35VDC.
The diagram below illustrates some typical open collector external circuits.

Model S4100T
12
3.7 Interconnection Details
Signal
Name
12-Way
Terminal
Function
If not used
Module
Fly lead colour
+ 24VDC
1
Power Supply
brown
SIG
2
Analogue output
connect to OV
yellow
OV
3
Power Supply Return
blue
CAL
4
Remote calibration input (Note)
leave unconnected*
grey
A2
5
Alarm 2 open collector output
leave unconnected*
orange
A1
6
Alarm 1 open collector output
leave unconnected*
violet
FLT
7
Fault open collector output
leave unconnected*
green/black
MA
8
Modbus 1 serial interface line A
leave unconnected*
red/black
MB
9
Modbus 1 serial interface line B
leave unconnected*
red/green
GA
10
Modbus 2 serial interface line A
leave unconnected*
red/brown
GB
11
Modbus 2 serial interface line B
leave unconnected*
red/blue
SCREEN
12
Terminate all cable screens (drain wires) at this connection
NA
Signal
Name
4-Way
Terminal
Function
Module
Fly lead colour
WHT
1
Sensor heater supply
white
BLK
2
Sensor heater return
black
RED
3
Sensor Bias supply
red
GRN
4
Sensor Bias Return
green
* Ensure conductor ends have been cut back so that bare conductors do not cause shorts.
NOTE: If remote calibration is required, connect the Remote Calibration Input to Power
Supply Return via a momentary action-NO-switch in the Safe Area. The switch
should be rated 5V, 5mA or better.
NOTE: For Smart Transmitter Interconnection Cable details consult Appendix A.
3.8 Power up Routine (see also Section 4.5 and 4.6)
When all wiring has been completed and checked, the instrument may be powered up.
Remove the red cap after power up. Replace the cap and desiccant if the sensor is to
be left off-power for long periods of time.
Immediately following power-up, the instrument will carry out “Display Test”, then blank
the display for 1 second, display “Software Revision” and then display “Power up in
progress”, followed by normal operation. The analogue output will be at 4.0mA and the
Fault open collector output energised.
The Smart Transmitter should then be allowed to stabilise for 24 hours. The display
should read “0” if no Hydrogen Sulphide gas is present at the sensor.
If the instrument indicates differently from the above, refer to Section 6, Trouble
Shooting.

Model S4100T
13
3.9 Stopping Plug Installation
NOTE: The stopping plug, 311001-1, is fitted at the factory, the following instruction
will only be necessary if the stopping plug has been removed from its current location
to another entry of this product.
Screw Earth/Stopping Plug (P/N 311001-1) into Top Entry of S4100x Housing.
Fully tighten using a suitable hand wrench.
Do not over tighten such that the O’Ring is damaged
Screw Continuity Hex Nut (P/N 928-814) on the inside of the S4100x Housing to the
Earth/Stopping Plug (P/N 311001-1).
Tighten to insure it is secure and making good contact with internal continuity plate.
If removing the Earth/Stopping Plug (P/N 311001-1), unscrew Continuity Hex Nut (P/N
928-814) on the inside of the S4100x Housing from the Earth/Stopping Plug.
Unscrew the Earth/Stopping Plug (P/N 311001-1) from the Top Entry of S4100x
Housing.

Model S4100T
14

Model S4100T
15
4.0 Operating Instructions
WARNING –Installation and Maintenance must be carried out by suitably skilled and
competent personnel only.
4.1 Menu Operation and Display Codes
Note: See Table 1 and Table 2 for Display Codes
Menu operation starts at Level 1. To enter the menu, the magnet is applied to the
General Monitors Logo on the Nameplate and held in place. The instrument will display
“- - -“ indicating magnet present. After 5 seconds delay the instrument will start scrolling
through Table 1, Level 1 at the rate of 1 step per 2 seconds, the magnet may now be
removed. In the presence of (latched) Alarms, the delay time will increase to 90
seconds. The scrolling will continue until a selection is made by briefly applying the
magnet. The display will rapid-flash the selection for one second to acknowledge. The
operation will then move to the next level corresponding to that selection, which can be
scrolled in a similar fashion, etc.
At all menu levels, the instrument will start “10 second menu timeout”, 30 seconds after
the last selection was made, allowing the user to re-enter the menu while the analogue
output is still at cal level (0.0, 1.5 or 2.0mA). Once “10 second menu timeout” has
expired, menu data is written to EEPROM, following which the instrument returns to
normal operation.
Calibration and Check Calibration mode will be terminated upon completion of the
corresponding calibration or calibration check procedure. The unit expects to “see”
calibration gas within 6 minutes following selection and will display the appropriate fault
code if no gas has been applied and exit the menu. Similar action occurs if the
calibration gas supply is interrupted during “Calibration in progress” or if the calibration
gas is not removed within 6 minutes following “Calibration completed.”
While in Check Calibration mode, Calibration mode may be activated by entering the
menu as normal.
When A1 alarm trip level, A2 alarm trip level or Calibration is selected, the current value
is shown on the display. The most significant digit will scroll and the desired value is
acknowledged by briefly applying the magnet, following which the next lower significant
digit will scroll and is acknowledged in similar fashion. The display will rapid-flash each
selection for one second to acknowledge. If the current value is acceptable, two
subsequent “acknowledge” commands, (one for each digit) will allow the user to
continue.
Setting A1 alarm trip level higher than the current A2 alarm trip level causes the A2
alarm trip level to be set to the same level as A1 alarm trip level and following
acknowledge of A1 alarm trip level the menu automatically jumps to “A2 alarm set up”
to alert the user and allow re-adjustment of A2 alarm trip level. Similar action occurs if
A2 alarm trip level is set lower than the current A1 alarm trip level.
Change of Option causes the instrument to enter Calibration mode immediately and
Alarm trip levels to change to default levels corresponding to the new Option,
alleviating the necessity of a password option.
Faults and Alarm status and ppm level determine which Level 1 menu selections are
available. Any Fault inhibits menu operation.